91 results on '"Stephen Howell"'
Search Results
2. Neoadjuvant rituximab modulates the tumor immune environment in patients with high risk prostate cancer
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Stephen T. Ryan, Jing Zhang, Danielle N. Burner, Michael Liss, Emily Pittman, Michelle Muldong, Ahmed Shabaik, Jason Woo, Nicole Basler, Jonathan Cunha, Shabnam Shalapour, Monica V. Estrada, Michael Karin, Karen Messer, Stephen Howell, Christopher J. Kane, and Christina A. M. Jamieson
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Prostate cancer ,Rituximab ,Immunotherapy ,CD20 ,CD3 ,PD-L1 ,Medicine - Abstract
Abstract Background Immunotherapeutic regulation of the tumor microenvironment in prostate cancer patients is not understood. Most antibody immunotherapies have not succeeded in prostate cancer. We showed previously that high-risk PCa patients have a higher density of tumor infiltrating B-cells in prostatectomy specimens. In mouse models, anti-CD20 antibody ablation of B-cells delayed PCa regrowth post-treatment. We sought to determine whether neoadjuvant anti-CD20 immunotherapy with rituximab could reduce CD20+ B cell infiltration of prostate tumors in patients. Methods An open label, single arm clinical trial enrolled eight high-risk PCa patients to receive one cycle of neoadjuvant rituximab prior to prostatectomy. Eleven clinical specimens with similar characteristics were selected as controls. Treated and control samples were concurrently stained for CD20 and digitally scanned in a blinded fashion. A new method of digital image quantification of lymphocytes was applied to prostatectomy sections of treated and control cases. CD20 density was quantified by a deconvolution algorithm in pathologist-marked tumor and adjacent regions. Statistical significance was assessed by one sided Welch’s t-test, at 0.05 level using a gatekeeper strategy. Secondary outcomes included CD3+ T-cell and PD-L1 densities. Results Mean CD20 density in the tumor regions of the treated group was significantly lower than the control group (p = 0.02). Mean CD3 density in the tumors was significantly decreased in the treated group (p = 0.01). CD20, CD3 and PD-L1 staining primarily occurred in tertiary lymphoid structures (TLS). Neoadjuvant rituximab was well-tolerated and decreased B-cell and T-cell density within high-risk PCa tumors compared to controls. Conclusions This is the first study to treat patients prior to surgical prostate removal with an immunotherapy that targets B-cells. Rituximab treatment reduced tumor infiltrating B and T-cell density especially in TLSs, thus, demonstrating inter-dependence between B- and T-cells in prostate cancer and that Rituximab can modify the immune environment in prostate tumors. Future studies will determine who may benefit from using rituximab to improve their immune response against prostate cancer. Trial registration NCT01804712, March 5th, 2013 https://clinicaltrials.gov/ct2/show/NCT01804712?cond=NCT01804712&draw=2&rank=1
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- 2020
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3. Lamotrigine versus levetiracetam or zonisamide for focal epilepsy and valproate versus levetiracetam for generalised and unclassified epilepsy: two SANAD II non-inferiority RCTs
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Anthony G Marson, Girvan Burnside, Richard Appleton, Dave Smith, John Paul Leach, Graeme Sills, Catrin Tudur-Smith, Catrin O Plumpton, Dyfrig A Hughes, Paula R Williamson, Gus Baker, Silviya Balabanova, Claire Taylor, Richard Brown, Dan Hindley, Stephen Howell, Melissa Maguire, Rajiv Mohanraj, and Philip EM Smith
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randomised controlled trials ,child ,adult ,humans ,epilepsies, partial ,epilepsy, generalised ,valproic acid ,lamotrigine ,levetiracetam ,zonisamide ,cost–benefit analysis ,technology assessment, biomedical ,intention-to-treat analysis ,quality of life ,quality-adjusted life-years ,united kingdom ,Medical technology ,R855-855.5 - Abstract
Background: Levetiracetam (Keppra®, UCB Pharma Ltd, Slough, UK) and zonisamide (Zonegran®, Eisai Co. Ltd, Tokyo, Japan) are licensed as monotherapy for focal epilepsy, and levetiracetam is increasingly used as a first-line treatment for generalised epilepsy, particularly for women of childbearing age. However, there is uncertainty as to whether or not they should be recommended as first-line treatments owing to a lack of evidence of clinical effectiveness and cost-effectiveness. Objectives: To compare the clinical effectiveness and cost-effectiveness of lamotrigine (Lamictal®, GlaxoSmithKline plc, Brentford, UK) (standard treatment) with levetiracetam and zonisamide (new treatments) for focal epilepsy, and to compare valproate (Epilim®, Sanofi SA, Paris, France) (standard treatment) with levetiracetam (new treatment) for generalised and unclassified epilepsy. Design: Two pragmatic randomised unblinded non-inferiority trials run in parallel. Setting: Outpatient services in NHS hospitals throughout the UK. Participants: Those aged ≥ 5 years with two or more spontaneous seizures that require anti-seizure medication. Interventions: Participants with focal epilepsy were randomised to receive lamotrigine, levetiracetam or zonisamide. Participants with generalised or unclassifiable epilepsy were randomised to receive valproate or levetiracetam. The randomisation method was minimisation using a web-based program. Main outcome measures: The primary outcome was time to 12-month remission from seizures. For this outcome, and all other time-to-event outcomes, we report hazard ratios for the standard treatment compared with the new treatment. For the focal epilepsy trial, the non-inferiority limit (lamotrigine vs. new treatments) was 1.329. For the generalised and unclassified epilepsy trial, the non-inferiority limit (valproate vs. new treatments) was 1.314. Secondary outcomes included time to treatment failure, time to first seizure, time to 24-month remission, adverse reactions, quality of life and cost-effectiveness. Results: Focal epilepsy. A total of 990 participants were recruited, of whom 330 were randomised to receive lamotrigine, 332 were randomised to receive levetiracetam and 328 were randomised to receive zonisamide. Levetiracetam did not meet the criteria for non-inferiority (hazard ratio 1.329) in the primary intention-to-treat analysis of time to 12-month remission (hazard ratio vs. lamotrigine 1.18, 97.5% confidence interval 0.95 to 1.47), but zonisamide did meet the criteria (hazard ratio vs. lamotrigine 1.03, 97.5% confidence interval 0.83 to 1.28). In the per-protocol analysis, lamotrigine was superior to both levetiracetam (hazard ratio 1.32, 95% confidence interval 1.05 to 1.66) and zonisamide (hazard ratio 1.37, 95% confidence interval 1.08 to 1.73). For time to treatment failure, lamotrigine was superior to levetiracetam (hazard ratio 0.60, 95% confidence interval 0.46 to 0.77) and zonisamide (hazard ratio 0.46, 95% confidence interval 0.36 to 0.60). Adverse reactions were reported by 33% of participants starting lamotrigine, 44% starting levetiracetam and 45% starting zonisamide. In the economic analysis, both levetiracetam and zonisamide were more costly and less effective than lamotrigine and were therefore dominated. Generalised and unclassifiable epilepsy. Of 520 patients recruited, 260 were randomised to receive valproate and 260 were randomised to receive to levetiracetam. A total of 397 patients had generalised epilepsy and 123 had unclassified epilepsy. Levetiracetam did not meet the criteria for non-inferiority in the primary intention-to-treat analysis of time to 12-month remission (hazard ratio 1.19, 95% confidence interval 0.96 to 1.47; non-inferiority margin 1.314). In the per-protocol analysis of time to 12-month remission, valproate was superior to levetiracetam (hazard ratio 1.68, 95% confidence interval 1.30 to 2.15). Valproate was superior to levetiracetam for time to treatment failure (hazard ratio 0.65, 95% confidence interval 0.50 to 0.83). Adverse reactions were reported by 37.4% of participants receiving valproate and 41.5% of those receiving levetiracetam. Levetiracetam was both more costly (incremental cost of £104, 95% central range –£587 to £1234) and less effective (incremental quality-adjusted life-year of –0.035, 95% central range –0.137 to 0.032) than valproate, and was therefore dominated. At a cost-effectiveness threshold of £20,000 per quality-adjusted life-year, levetiracetam was associated with a probability of 0.17 of being cost-effective. Limitations: The SANAD II trial was unblinded, which could have biased results by influencing decisions about dosing, treatment failure and the attribution of adverse reactions. Future work: SANAD II data could now be included in an individual participant meta-analysis of similar trials, and future similar trials are required to assess the clinical effectiveness and cost-effectiveness of other new treatments, including lacosamide and perampanel. Conclusions: Focal epilepsy – The SANAD II findings do not support the use of levetiracetam or zonisamide as first-line treatments in focal epilepsy. Generalised and unclassifiable epilepsy – The SANAD II findings do not support the use of levetiracetam as a first-line treatment for newly diagnosed generalised epilepsy. For women of childbearing potential, these results inform discussions about the benefit (lower teratogenicity) and harm (worse seizure outcomes and higher treatment failure rate) of levetiracetam compared with valproate. Trial registration: Current Controlled Trials ISRCTN30294119 and EudraCT 2012-001884-64. Funding: This project was funded by the National Institute for Health Research (NIHR) Health Technology Assessment programme and will be published in full in Health Technology Assessment; Vol. 25, No. 75. See the NIHR Journals Library website for further project information.
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- 2021
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4. Estimation of Level and Deformed First-Year Sea Ice Surface Roughness in the Canadian Arctic Archipelago from C- and L-Band Synthetic Aperture Radar
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Silvie Marie Cafarella, Randall Scharien, Torsten Geldsetzer, Stephen Howell, Christian Haas, Rebecca Segal, and Sasha Nasonova
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Environmental sciences ,GE1-350 ,Technology - Abstract
Utilizing synthetic aperture radar (SAR) data to understand and map sea ice roughness is an active area of research. An object-based image analysis is here used to quantitatively link the winter first-year sea ice surface roughness to C-band RADARSAT-2 and L-band ALOS-2 PALSAR-2 SAR backscatter measured in the Canadian Arctic. Results indicate: (1) C-band HH-polarization backscatter is correlated with roughness (r = 0.86) at a shallow incidence angle; and (2) L-band HH- and VV-polarization backscatter is correlated with roughness (r = 0.82) at a shallow incidence angle. Retrieval models for surface roughness are developed and applied to the imagery to demonstrate the potential of SAR for mapping deformation with a best case RMSE of 5 mm. Additionally, strong correlations between C- and L-band SAR backscatter acquired during the advanced melt period, and the winter measured surface roughness, are observed. These results are discussed in the context of SAR potentially providing significant sea ice structural information despite the occurrence of melt and presence of surface melt ponds.
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- 2019
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5. Correction: Novel broad-spectrum activity-based probes to profile malarial cysteine proteases.
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Michele S Y Tan, Dara Davison, Mateo I Sanchez, Bethany M Anderson, Stephen Howell, Ambrosius P Snijders, Laura E Edgington-Mitchell, and Edgar Deu
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Medicine ,Science - Abstract
[This corrects the article DOI: 10.1371/journal.pone.0227341.].
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- 2020
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6. Novel broad-spectrum activity-based probes to profile malarial cysteine proteases.
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Michele S Y Tan, Dara Davison, Mateo I Sanchez, Bethany M Anderson, Stephen Howell, Ambrosius Snijders, Laura E Edgington-Mitchell, and Edgar Deu
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Medicine ,Science - Abstract
Clan CA cysteine proteases, also known as papain-like proteases, play important roles throughout the malaria parasite life cycle and are therefore potential drug targets to treat this disease and prevent its transmission. In order to study the biological function of these proteases and to chemically validate some of them as viable drug targets, highly specific inhibitors need to be developed. This is especially challenging given the large number of clan CA proteases present in Plasmodium species (ten in Plasmodium falciparum), and the difficulty of designing selective inhibitors that do not cross-react with other members of the same family. Additionally, any efforts to develop antimalarial drugs targeting these proteases will also have to take into account potential off-target effects against the 11 human cysteine cathepsins. Activity-based protein profiling has been a very useful tool to determine the specificity of inhibitors against all members of an enzyme family. However, current clan CA proteases broad-spectrum activity-based probes either target endopeptidases or dipeptidyl aminopeptidases, but not both subfamilies efficiently. In this study, we present a new series of dipeptydic vinyl sulfone probes containing a free N-terminal tryptophan and a fluorophore at the P1 position that are able to label both subfamilies efficiently, both in Plasmodium falciparum and in mammalian cells, thus making them better broad-spectrum activity-based probes. We also show that some of these probes are cell permeable and can therefore be used to determine the specificity of inhibitors in living cells. Interestingly, we show that the choice of fluorophore greatly influences the specificity of the probes as well as their cell permeability.
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- 2020
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7. Long-Term Analysis of Sea Ice Drift in the Western Ross Sea, Antarctica, at High and Low Spatial Resolution
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Usama Farooq, Wolfgang Rack, Adrian McDonald, and Stephen Howell
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sea ice ,motion tracking ,Envisat ASAR ,Polar Pathfinder ,NSIDC ,Western Ross Sea ,Science - Abstract
The Ross Sea region, including three main polynya areas in McMurdo Sound, Terra Nova Bay, and in front of the Ross Ice Shelf, has experienced a significant increase in sea ice extent in the first four decades of satellite observations. Here, we use Co-Registration of Optically Sensed Images and Correlation (COSI-Corr) to estimate 894 high-resolution sea ice motion fields of the Western Ross Sea in order to explore ice-atmosphere interactions based on sequential high-resolution Advanced Synthetic Aperture Radar (ASAR) images from the Envisat satellite acquired between 2002–2012. Validation of output motion vectors with manually drawn vectors for 24 image pairs show Pearson correlation coefficients of 0.92 ± 0.09 with a mean deviation in direction of −3.17 ± 6.48 degrees. The high-resolution vectors were also validated against the Environment and Climate Change Canada sea ice motion tracking algorithm, resulting in correlation coefficients of 0.84 ± 0.20 and the mean deviation in the direction of −0.04 ± 17.39 degrees. A total of 480 one-day separated velocity vector fields have been compared to an available NSIDC low-resolution sea ice motion vector product, showing much lower correlations and high directional differences. The high-resolution product is able to better identify short-term and spatial variations, whereas the low-resolution product underestimates the actual sea ice velocities by 47% in this important near-coastal region. The large-scale pattern of sea ice drift over the full time period is similar in both products. Improved image coverage is still desired to capture drift variations shorter than 24 h.
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- 2020
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8. Project #CyborgArt: A Teaching Case Study on the Affordances Programmable Sensors in Mixed Media Art Projects
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Susan Sweeney and Stephen Howell
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graduate skills, modern consumer, human, technological, & data literacies, computational thinking, wearables, sensors ,Business ,HF5001-6182 - Abstract
Modern graduates of all disciplines require proficiency with new literacies to complement and enhance traditional higher-level education. Local and multinational businesses struggle to source graduates with both practical skills, an understanding of the modern consumer, and the challenges of integrating technology safely into almost every facet of life. This paper presents a multi-disciplinary module project that required students to create a mixed-media art piece representing the students’ vision of themselves as cybernetic organisms. The module was delivered over one semester and incorporated industry speakers and workshops on non-traditional topics for the discipline of these students. One of these topics was Coding for Non-Coders and Wearable and Embeddable Technology. This paper examines the affordances the students gained by learning how to incorporate simple, cheap but effective sensors in their art.
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- 2018
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9. Correction: Assessment of the High Resolution SAR Mode of the RADARSAT Constellation Mission for First Year Ice and Multiyear Ice Characterization. Remote Sensing 2018, 10, 594
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Mohammed Dabboor, Benoit Montpetit, and Stephen Howell
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n/a ,Science - Abstract
In Figure 5 of [1], we detected a minor mistake in the visualization of the Spearman correlation related to the color bar.[...]
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- 2018
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10. Assessment of the High Resolution SAR Mode of the RADARSAT Constellation Mission for First Year Ice and Multiyear Ice Characterization
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Mohammed Dabboor, Benoit Montpetit, and Stephen Howell
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SAR ,compact polarimetry ,sea ice ,classification ,Science - Abstract
Simulated compact polarimetry from the RADARSAT Constellation Mission (RCM) is evaluated for sea ice classification. Compared to previous studies that evaluated the potential of RCM for sea ice classification, this study focuses on the High Resolution (HR) Synthetic Aperture Radar (SAR) mode of the RCM associated with a higher noise floor (Noise Equivalent Sigma Zero of −19 dB), which can prove challenging for sea ice monitoring. Twenty three Compact Polarimetric (CP) parameters were derived and analyzed for the discrimination between first year ice (FYI) and multiyear ice (MYI). The results of the RCM HR mode are compared with those previously obtained for other RCM SAR modes for possible CP consistency parameters in sea ice classification under different noise floors, spatial resolutions, and radar incidence angles. Finally, effective CP parameters were identified and used for the classification of FYI and MYI using the Random Forest (RF) classification algorithm. This study indicates that, despite the expected high noise floor of the RCM HR mode, CP SAR data from this mode are promising for the classification of FYI and MYI in dry ice winter conditions. The overall classification accuracies of CP SAR data over two test sites (96.13% and 96.84%) were found to be comparable to the accuracies obtained using Full Polarimetric (FP) SAR data (98.99% and 99.20%).
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- 2018
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11. Improving Sea Ice Characterization in Dry Ice Winter Conditions Using Polarimetric Parameters from C- and L-Band SAR Data
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Mohammed Dabboor, Benoit Montpetit, Stephen Howell, and Christian Haas
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L-band SAR ,sea ice ,polarimetric parameters ,classification ,Science - Abstract
Sea ice monitoring and classification is one of the main applications of Synthetic Aperture Radar (SAR) remote sensing. C-band SAR imagery is regarded as an optimal choice for sea ice applications; however, other SAR frequencies has not been extensively assessed. In this study, we evaluate the potential of fully polarimetric L-band SAR imagery for monitoring and classifying sea ice during dry winter conditions compared to fully polarimetric C-band SAR. Twelve polarimetric SAR parameters are derived using sets of C- and L-band SAR imagery and the capabilities of the derived parameters for the discrimination between First Year Ice (FYI) and Old Ice (OI), which is considered to be a mixture of Second Year Ice (SYI) and Multiyear Ice (MYI), are investigated. Feature vectors of effective C- and L-band polarimetric parameters are extracted and used for sea ice classification. Results indicate that C-band SAR provides high classification accuracy (98.99%) of FYI and OI in comparison to the obtained accuracy using L-band SAR (82.17% and 81.85%), as expected. However, L-band SAR was found to classify only the MYI floes as OI, while merging both FYI and SYI into one separate class. This comes in contrary to C-band SAR, which classifies as OI both MYI and SYI. This indicates a new potential for discriminating SYI from MYI by combining C- and L-band SAR in dry ice winter conditions.
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- 2017
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12. Molecular evidence for gender differences in the migratory behaviour of a small seabird.
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Renata J Medeiros, R Andrew King, William O C Symondson, Bernard Cadiou, Bernard Zonfrillo, Mark Bolton, Rab Morton, Stephen Howell, Anthony Clinton, Marcial Felgueiras, and Robert J Thomas
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Medicine ,Science - Abstract
Molecular sexing revealed an unexpectedly strong female bias in the sex ratio of pre-breeding European Storm Petrels (Hydrobates pelagicus), attracted to playback of conspecific calls during their northwards migration past SW Europe. This bias was consistent across seven years, ranging from 80.8% to 89.7% female (mean annual sex ratio ± SD = 85.5% female ±4.1%). The sex ratio did not differ significantly from unity (i.e., 50% female) among (i) Storm Petrel chicks at a breeding colony in NW France, (ii) adults found dead on beaches in Southern Portugal, (iii) breeding birds attending nest burrows in the UK, captured by hand, and (iv) adults captured near a breeding colony in the UK using copies of the same sound recordings as used in Southern Europe, indicating that females are not inherently more strongly attracted to playback calls than males. A morphological discriminant function analysis failed to provide a good separation of the sexes, showing the importance of molecular sexing for this species. We found no sex difference in the seasonal or nocturnal timing of migration past Southern Europe, but there was a significant tendency for birds to be caught in sex-specific aggregations. The preponderance of females captured in Southern Europe suggests that the sexes may differ in migration route or in their colony-prospecting behaviour during migration, at sites far away from their natal colonies. Such differences in migration behaviour between males and females are poorly understood but have implications for the vulnerability of seabirds to pollution and environmental change at sea during the non-breeding season.
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- 2012
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13. Year-Around C- and L- Band Observation Around the Mosaic Ice Floe with High Spatial and Temporal Resolution.
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Suman Singha, A. Malin Johansson, Gunnar Spreen, Stephen Howell, Shin-ichi Sobue, and Malcolm Davidson
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- 2021
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14. Review of Player Personality Classifications to Inform Game Design.
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Philip Bourke, David Murphy, John O'Mullane, Kevin Marshall, and Stephen Howell
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- 2018
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15. A New Structure for the Sea Ice Essential Climate Variables of the Global Climate Observing System
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Thomas Lavergne, Stefan Kern, Signe Aaboe, Lauren Derby, Gorm Dybkjaer, Gilles Garric, Petra Heil, Stefan Hendricks, Jürgen Holfort, Stephen Howell, Jeffrey Key, Jan L Lieser, Ted Maksym, Wieslaw Maslowski, Walt Meier, Joaquín Muñoz-Sabater, Julien Nicolas, Burcu Özsoy, Benjamin Rabe, Wolfgang Rack, Marilyn Raphael, Patricia de Rosnay, Vasily Smolyanitsky, Steffen Tietsche, Jinro Ukita, Marcello Vichi, Penelope Wagner, Sascha Willmes, and Xi Zhao
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Atmospheric Science - Abstract
Climate observations inform about the past and present state of the climate system. They underpin climate science, feed into policies for adaptation and mitigation, and increase awareness of the impacts of climate change. The Global Climate Observing System (GCOS), a body of the World Meteorological Organization (WMO), assesses the maturity of the required observing system and gives guidance for its development. The Essential Climate Variables (ECVs) are central to GCOS, and the global community must monitor them with the highest standards in the form of Climate Data Records (CDR). Today, a single ECV—the sea ice ECV—encapsulates all aspects of the sea ice environment. In the early 1990s it was a single variable (sea ice concentration) but is today an umbrella for four variables (adding thickness, edge/extent, and drift). In this contribution, we argue that GCOS should from now on consider a set of seven ECVs (sea ice concentration, thickness, snow depth, surface temperature, surface albedo, age, and drift). These seven ECVs are critical and cost effective to monitor with existing satellite Earth observation capability. We advise against placing these new variables under the umbrella of the single sea ice ECV. To start a set of distinct ECVs is indeed critical to avoid adding to the suboptimal situation we experience today and to reconcile the sea ice variables with the practice in other ECV domains.
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- 2022
16. Representation of sea ice regimes in the Western Ross Sea, Antarctica, based on satellite imagery and AMPS wind data
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Usama Farooq, Wolfgang Rack, Adrian McDonald, and Stephen Howell
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Atmospheric Science - Abstract
Sea ice drift data at high spatial resolution and surface wind model output are used to explore atmosphere-sea ice interactions in the Western Ross Sea including the three main polynyas areas; McMurdo Sound polynya (MSP), Terra Nova Bay polynya (TNBP), and the Ross Sea polynya (RSP). This study quantifies the relationship between the winds and sea ice drift and observes the average and annual anomalies across the region. Sea ice drift velocities are based on high-resolution (150 m) Advanced Synthetic Aperture Radar (ASAR) images from Envisat for winters between 2002 and 2012. Sea ice motion vectors were first correlated with the corresponding Antarctic Mesoscale Prediction System (AMPS) surface wind velocities, and the sensitivity of the spatial correlations and residuals were examined. Four drift parameters were selected (mean drift, the correlation between drift and wind, drift to wind scaling factor, and the directional drift constancy) to perform an unsupervised k-means classification to automatically distinguish six zones of distinctive sea ice characteristics solely based on ice drift and wind information. Results indicate a heterogeneous pattern of sea ice movement at a rate ranging from 0.41 to 2.24% of the wind speed in different areas. We also find that the directional constancy of sea ice drift is closely related to the wind fields. Sea ice drift and wind velocities display the highest correlation in free-drift areas (R = 0.70), followed by deformational drift zones (R = 0.54), and more random drift areas (R = 0.28). The classification illustrates the significance of localized wind-driven sea ice drift in this coastal area resulting in zones of convergence, shear, and free drift. The results also indicate that the most persistent patterns of sea ice motion are near the RSP and TNBP areas, both being driven by strong localized winds. Our findings identify that large-scale sea ice motion is predominantly wind-driven over much of the study area while ocean currents play only a minor role.
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- 2022
17. Designing serious games with linguistic resources.
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Stephen Howell and Tony Veale
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- 2009
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18. Using Headline Indicators to Monitor the State of Global Climate
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Blair Trewin, Anny Cazenave, Stephen Howell, Matthias Huss, Kirsten Isensee, Matthew D. Palmer, Oksana Tarasova, and Alex Vermeulen
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Atmospheric Science - Published
- 2021
19. A TKA Insert with A Lateral Flat Articular Surface Maximizes External and Internal Tibial Orientations without Anterior Lift-Off Relative to Low- and Ultracongruent Surfaces
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Stephen Howell, Alexander Nedopil, and Maury Hull
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Medicine (miscellaneous) ,total knee arthroplasty ,kinematic alignment ,implant design ,PCL retention ,congruency congruency - Abstract
Background: In total knee arthroplasty (TKA), inserts can have different levels of medial and lateral congruency determined by the acuteness of the upslopes of the anterior and posterior articular surfaces. The present study evaluated an insert with different levels of lateral congruency and a medial ball-in-socket congruency to test the hypothesis that a lateral flat (F) insert maximizes external tibial orientation at extension and internal orientation at 90° flexion and lowers the incidence of anterior lift-off relative to low-congruent (LC) and ultracongruent (UC) lateral inserts. Methods: Two surgeons treated 23 patients with unrestricted caliper-verified kinematic alignment (KA) and posterior cruciate ligament (PCL) retention. They randomly trialed inserts with a medial radial dial that functioned as a built-in goniometer by measuring the tibial orientation relative to a sagittal line on the femoral trial component. Anterior lift-off of the insert from the baseplate indicated PCL tightness. Results: The F insert’s mean of 9° of external tibial orientation was higher than that of the LC (5°, p < 0.0001) and UC inserts (2°, p < 0.0001). The −13° of internal tibial orientation at 90° flexion was higher than that of the LC (−9°, p < 0.0001) and UC inserts (−7°, p < 0.0001). The 0% incidence of anterior lift-off was less than that of the LC (26%) and UC inserts (57%) (p < 0.0001). Conclusions: Surgeons and implant manufacturers should know that adding congruency to the lateral articular surface limits external tibial orientation in extension and internal tibial orientation at 90° flexion and overtightens the PCL. These rotational limitations and flexion space tightness can adversely affect patellofemoral tracking and knee flexion.
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- 2022
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20. 'Toxic Encephalopathy following Methamphetamine, MDMA, and Marijuana Intoxication: A Case Report'
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Stephen Howell
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General Medicine - Published
- 2022
21. Using a kinect‐based game to teach oral hygiene in four elementary students with intellectual disabilities
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Yao-Jen Chang, Ya-Shu Kang, and Stephen Howell
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Male ,Activities of daily living ,media_common.quotation_subject ,education ,Oral hygiene ,Education ,Skills training ,Hygiene ,Intellectual Disability ,Intervention (counseling) ,Intellectual disability ,ComputingMilieux_COMPUTERSANDEDUCATION ,Developmental and Educational Psychology ,medicine ,Humans ,Child ,Students ,Video game ,media_common ,Medical education ,business.industry ,Oral Hygiene ,medicine.disease ,Multiple baseline design ,Video Games ,Female ,business ,Psychology - Abstract
Background Individuals with intellectual disabilities (ID) may have difficulties in performing daily living tasks. Among other daily living tasks, independent oral hygiene is an essential life skill for people with ID. Materials and methods Four children with intellectual disabilities (two males and two females, ages 7-11) participated in the experiment. We employed the KinectTM V2 sensor to gamify oral hygiene skill training. Specifically, a non-concurrent multiple baseline design was adopted to demonstrate the relation between game-based intervention and independent oral hygiene skills. Results All students learned how to brush their teeth independently and maintained the skill 4 weeks later with the introduction of the game-based training. Social validity results showed the teachers and parents considered the video game was useful. Conclusions The proposed Kinect-based video game might be used for effective training of elementary students with ID to improve oral hygiene independently.
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- 2020
22. The impact and challenges of the 2018 MHRA statement on the use of sodium valproate in women of childbearing age during the first year of implementation, in a UK epilepsy centre
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Jon M Dickson, Alice Brockington, Priya Shanmugarajah, Markus Reuber, Gary Dennis, Philippa Davies, Stephen Howell, Theocharis Tsironis, and Richard A. Grünewald
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Adult ,Pediatrics ,medicine.medical_specialty ,Adolescent ,Young Adult ,03 medical and health sciences ,Epilepsy ,0302 clinical medicine ,Pregnancy ,Health care ,medicine ,Humans ,Learning Disabilities ,business.industry ,Valproic Acid ,Patient choice ,Contraindications, Drug ,Attendance ,General Medicine ,Middle Aged ,medicine.disease ,United Kingdom ,Pregnancy Complications ,Contraception ,Cross-Sectional Studies ,Neurology ,Childbearing age ,Anticonvulsants ,Female ,Active Follow-up ,Neurology (clinical) ,Regulatory agency ,business ,030217 neurology & neurosurgery - Abstract
Purpose On 24/04/2018, the United Kingdom (UK) Medicines and Healthcare Products Regulatory Agency (MHRA) clarified previous policies by issuing a statement, that the use of sodium valproate is contraindicated in women of childbearing potential unless the conditions of a pregnancy prevention programme are met, and only if other treatments are ineffective or not tolerated. We evaluated the impact of this over the first year of implementation in a tertiary epilepsy centre. Methods Cross-sectional study of all women under active follow up, or newly referred, of childbearing age (16–55 years), taking valproate for the treatment of epilepsy, over 12 months from 01/05/2018. Results We identified 125 cases, with 31 newly referred in response to MHRA regulations. 9.6% of patients did not attend their appointment, 35.2% had a learning disability (LD), which in 19.2% was sufficiently severe that they could not consent to a sexual relationship. Patients with LD prescribed valproate were significantly younger, and more likely to have a focal or uncharacterised epilepsy than patients without LD. In 46.4% of patients, MHRA regulations were followed: women were already using highly active contraception (HAC), HAC was started, or valproate withdrawn. In 24.8% of cases, women elected to continue valproate, and were not willing to use HAC. Conclusions In 53.6% of cases, MHRA regulations contraindicating the use valproate in women of childbearing potential could not be followed fully, due to lack of patient attendance, lack of applicability in severe LD, or ethical concerns relating to patient choice.
- Published
- 2020
23. Reply on RC2
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Stephen Howell
- Published
- 2021
24. Comparison of digitized Canadian ice charts and passive microwave sea-ice concentrations.
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Tom A. Agnew and Stephen Howell
- Published
- 2002
- Full Text
- View/download PDF
25. First Observations of a Polynya in the Last Ice Area North of Ellesmere Island
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G. W. K. Moore, Stephen Howell, and Michael Brady
- Published
- 2021
26. Value of witness observations in the differential diagnosis of transient loss of consciousness
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R A Grünewald, Mark Broadhurst, Jenny Jamnadas-Khoda, Min Chen, Dale Hesdorffer, Markus Reuber, Matthias Koepp, Stephen Howell, Matthew C. Walker, Sanjay M. Sisodiya, Steve W Parry, and Melanie Wall
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Pediatrics ,medicine.medical_specialty ,Neurology ,business.industry ,Unconsciousness ,Retrospective cohort study ,medicine.disease ,Logistic regression ,03 medical and health sciences ,Epilepsy ,0302 clinical medicine ,medicine ,Psychogenic disease ,Medical history ,030212 general & internal medicine ,Neurology (clinical) ,Young adult ,medicine.symptom ,business ,030217 neurology & neurosurgery - Abstract
Objective This retrospective study explores to what extent additional information from event witnesses provided using the novel 31-item Paroxysmal Event Observer (PEO) Questionnaire improves the differentiation among epilepsy, syncope, and psychogenic nonepileptic seizures (PNES) achievable with information provided by patients alone. Methods Patients with transient loss of consciousness caused by proven epilepsy (n = 86), syncope (n = 79), or PNES (n = 84) attending specialist neurology/syncope services in the United Kingdom and event observers provided Paroxysmal Event Profile (PEP), PEO, and personal information (PI) (e.g., sex, age, medical history) data. PEO data were subjected to exploratory factor analysis (EFA) followed by confirmatory factor analysis (CFA). PEO, PEP, and PI data were used separately and in combination to differentiate diagnoses by pairwise and multinomial logistic regressions. Predicted diagnoses were compared with gold standard medical diagnoses. Results EFA/CFA identified a 4-factor structure of the PEO based on 26/31 questionnaire items with loadings ≥0.4. Observer-reported factors alone differentiated better between syncope and epilepsy than patient-reported factors (accuracy: 96% vs 85%, p = 0.0004). Observer-reported data improved accuracy over differentiation based on patient-reported data alone from 90% to 100% between syncope and epilepsy ( p = 0.005), 76% to 83% between epilepsy and PNES ( p = 0.006), and 93% to 95% between syncope and PNES ( p = 0.098). Conclusions Information from observers can make an important contribution to the differentiation of epilepsy from syncope or PNES but adds less to that of syncope from PNES.
- Published
- 2019
27. Life Is Mostly Fun
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Stephen Howell and Stephen Howell
- Abstract
From the calloused hands of a former coal miner emerges a heartfelt collection that reminds us that even in life's toughest terrains, there is light to be found. Life is Mostly Fun is a tapestry of poems that spin tales of joy, wonder, and yes, the occasional hurdles that prove no match for an unshakeable spirit. With a keen eye for the quirks and humour that colour our everyday existence, the author invites you to join him on a romp through sunny vignettes that will leave you grinning from ear to ear. Yet he also digs deep, unearthing profound truths about our shared human experience that will resonate long after the final line. Whether finding magic in the mundane or plumbing the depths of the soul, these verses celebrate life in all its messy, luminous glory.
- Published
- 2024
28. Headline Indicators for Global Climate Monitoring
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Alex Vermeulen, Anny Cazenave, Stephen Howell, Oksana Tarasova, Matthew D. Palmer, Kirsten Isensee, Matthias Huss, Blair Trewin, Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), and Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)
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Atmospheric Science ,geography ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,0207 environmental engineering ,Ocean acidification ,02 engineering and technology ,Antarctic sea ice ,01 natural sciences ,Glacier mass balance ,Arctic ,[SDU]Sciences of the Universe [physics] ,[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology ,Arrears ,Climatology ,Sea ice ,Environmental science ,Ocean heat content ,020701 environmental engineering ,Sea level ,0105 earth and related environmental sciences - Abstract
The World Meteorological Organization has developed a set of headline indicators for global climate monitoring. These seven indicators are a subset of the existing set of essential climate variables (ECVs) established by the Global Climate Observing System and are intended to provide the most essential parameters representing the state of the climate system. These indicators include global mean surface temperature, global ocean heat content, state of ocean acidification, glacier mass balance, Arctic and Antarctic sea ice extent, global CO2 mole fraction, and global mean sea level. This paper describes how well each of these indicators are currently monitored, including the number and quality of the underlying datasets; the health of those datasets; observation systems used to estimate each indicator; the timeliness of information; and how well recent values can be linked to preindustrial conditions. These aspects vary widely between indicators. While global mean surface temperature is available in close to real time and changes from preindustrial levels can be determined with relatively low uncertainty, this is not the case for many other indicators. Some indicators (e.g., sea ice extent) are largely dependent on satellite data only available in the last 40 years, while some (e.g., ocean acidification) have limited underlying observational bases, and others (e.g., glacial mass balance) with data only available a year or more in arrears.
- Published
- 2021
29. Equity versus efficiency: managing competing values for the public sector leisure professional
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Stephen Howell and Michael McNamee
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Equity (economics) ,Public economics ,business.industry ,Public sector ,Business - Published
- 2020
30. Response to Reviewer #3
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Stephen Howell
- Published
- 2020
31. Response to Reviewer #1
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Stephen Howell
- Published
- 2020
32. Response to Reviewer #2
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Stephen Howell
- Published
- 2020
33. Clinical features which predict neuronal surface autoantibodies in new-onset focal epilepsy: implications for immunotherapies
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Adam E. Handel, Stephen Howell, Patrick Waters, Arjune Sen, T Moloney, Holger Kramer, Jane E. Adcock, Bethan Lang, Andrew Fower, Emma Torzillo, Ronan N. McGinty, Archana Ramesh, and Sarosh R. Irani
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Neuro-Inflammation ,Adult ,Male ,Adolescent ,medicine.medical_treatment ,Nerve Tissue Proteins ,neuroimmunology ,Antibodies ,Cohort Studies ,03 medical and health sciences ,Epilepsy ,Young Adult ,0302 clinical medicine ,Predictive Value of Tests ,Current Literature in Clinical Research ,medicine ,Humans ,030304 developmental biology ,Aged ,Autoantibodies ,Autoimmune encephalitis ,0303 health sciences ,business.industry ,Autoantibody ,Immunotherapy ,Middle Aged ,medicine.disease ,autoimmune encephalitis ,Psychiatry and Mental health ,Mood ,Neuroimmunology ,ROC Curve ,Immunology ,Cohort ,Encephalitis ,Surgery ,Female ,Neurology (clinical) ,Epilepsies, Partial ,business ,030217 neurology & neurosurgery - Abstract
Clinical Features Which Predict Neuronal Surface Autoantibodies in New-Onset Focal Epilepsy: Implications for Immunotherapies McGinty RN, Handel A, Moloney T, et al. J Neurol Neurosurg Psychiatry. 2020;92(3):291-294. doi:10.1136/jnnp-2020-325011Objective:To generate a score which clinically identifies surface-directed autoantibodies in adults with new-onset focal epilepsy and evaluate the value of immunotherapy in this clinical setting.Methods:Prospective clinical and autoantibody evaluations in a cohort of 219 consecutive patients with new-onset focal epilepsy.Results:A total of 10.5% (23/219) of people with new-onset focal epilepsy had detectable serum autoantibodies to known or novel cell surface antigenic targets. Nine of 23 with autoantibodies were diagnosed with encephalitis, by contrast to 0/196 without autoantibodies (P < .0001). Multivariate analysis identified 6 features which predicted autoantibody positivity (area under the curve = 0.83): age ≥54 years, ictal piloerection, lowered self-reported mood, reduced attention, magnetic resonance imaging limbic system changes, and the absence of conventional epilepsy risk factors. Eleven (79%) of 14 patients with detectable autoantibodies, but without encephalitis, showed excellent long-term outcomes (modified Rankin Score = 0) despite no immunotherapy. These outcomes were superior to those of immunotherapy-treated patients with confirmed autoantibody-mediated encephalitis (P < .05).Conclusions:Seizure semiology, cognitive and mood phenotypes, alongside inflammatory investigation findings, aid the identification of surface autoantibodies among unselected people with new-onset focal epilepsy. The excellent immunotherapy-independent outcomes of autoantibody-positive patients without encephalitis suggest immunotherapy administration should be guided by clinical features of encephalitis, rather than autoantibody positivity. Our findings suggest that, in this cohort, immunotherapy-responsive seizure syndromes with autoantibodies largely fall under the umbrella of autoimmune encephalitis. Antibodies Contributing to Focal Epilepsy Signs and Symptoms Score. de Bruijn M, Bastiaansen AEM, Mojzisova H, et al. Ann Neurol. 2021;89(4):698-710. doi:https://doi.org/10.1002/ana.26013.Objective:Diagnosing autoimmune encephalitis (AIE) is difficult in patients with less fulminant diseases such as epilepsy. However, recognition is important, as patients require immunotherapy. This study aims to identify antibodies in patients with focal epilepsy of unknown etiology and to create a score to preselect patients requiring testing.Methods:In this prospective, multicenter cohort study, adults with focal epilepsy of unknown etiology, without recognized AIE, were included, between December 2014 and December 2017, and followed for 1 year. Serum, and if available cerebrospinal fluid, were analyzed using different laboratory techniques. The ACES score was created using factors favoring an autoimmune etiology of seizures (AES), as determined by multivariate logistic regression. The model was externally validated and evaluated using the Concordance (C) statistic.Results:We included 582 patients, with median epilepsy duration of 8 years (interquartile range = 2-18). Twenty (3.4%) patients had AES, of whom 3 had anti-leucine-rich glioma inactivated 1, 3 had anti-contactin-associated protein-like 2, 1 had anti-N-methyl-d-aspartate receptor, and 13 had antiglutamic acid decarboxylase 65 (enzyme-linked immunosorbent assay concentrations >10 000 IU/mL). Risk factors for AES were temporal magnetic resonance imaging hyperintensities (odds ratio [OR] = 255.3, 95% CI = 19.6-3332.2, P < .0001), autoimmune diseases (OR = 13.31, 95% CI = 3.1-56.6, P = .0005), behavioral changes (OR = 12.3, 95% CI = 3.2-49.9, P = .0003), autonomic symptoms (OR = 13.3, 95% CI = 3.1-56.6, P = .0005), cognitive symptoms (OR = 30.6, 95% CI = 2.4-382.7, P = .009), and speech problems (OR = 9.6, 95% CI = 2.0-46.7, P = .005). The internally validated C-statistic was 0.95 and 0.92 in the validation cohort (n = 128). Assigning each factor 1 point, an antibodies contributing to focal epilepsy signs and symptoms (ACES) score ≥2 had a sensitivity of 100% to detect AES, and a specificity of 84.9%.Interpretation:Specific signs point toward AES in focal epilepsy of unknown etiology. The ACES score (cutoff ≥ 2) is useful to select patients requiring antibody testing.
- Published
- 2020
34. Machine learning as a diagnostic decision aid for patients with transient loss of consciousness
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Stephen Howell, Matthias Koepp, Timothy J Heaton, Jenny Jamnadas-Khoda, Matthew C. Walker, Markus Reuber, Alistair Wardrope, Sanjay M. Sisodiya, Steve W Parry, Richard A. Grünewald, and Mark Broadhurst
- Subjects
Pediatrics ,medicine.medical_specialty ,business.industry ,Research ,MEDLINE ,Class iii ,medicine.disease ,Confidence interval ,Secondary care ,03 medical and health sciences ,Epilepsy ,0302 clinical medicine ,medicine ,Psychogenic disease ,030212 general & internal medicine ,Neurology (clinical) ,Medical diagnosis ,business ,030217 neurology & neurosurgery ,Questionnaire study - Abstract
BackgroundTransient loss of consciousness (TLOC) is a common reason for presentation to primary/emergency care; over 90% are because of epilepsy, syncope, or psychogenic non-epileptic seizures (PNES). Misdiagnoses are common, and there are currently no validated decision rules to aid diagnosis and management. We seek to explore the utility of machine-learning techniques to develop a short diagnostic instrument by extracting features with optimal discriminatory values from responses to detailed questionnaires about TLOC manifestations and comorbidities (86 questions to patients, 31 to TLOC witnesses).MethodsMulti-center retrospective self- and witness-report questionnaire study in secondary care settings. Feature selection was performed by an iterative algorithm based on random forest analysis. Data were randomly divided in a 2:1 ratio into training and validation sets (163:86 for all data; 208:92 for analysis excluding witness reports).ResultsThree hundred patients with proven diagnoses (100 each: epilepsy, syncope and PNES) were recruited from epilepsy and syncope services. Two hundred forty-nine completed patient and witness questionnaires: 86 epilepsy (64 female), 84 PNES (61 female), and 79 syncope (59 female). Responses to 36 questions optimally predicted diagnoses. A classifier trained on these features classified 74/86 (86.0% [95% confidence interval 76.9%–92.6%]) of patients correctly in validation (100 [86.7%–100%] syncope, 85.7 [67.3%–96.0%] epilepsy, 75.0 [56.6%–88.5%] PNES). Excluding witness reports, 34 features provided optimal prediction (classifier accuracy of 72/92 [78.3 (68.4%–86.2%)] in validation, 83.8 [68.0%–93.8%] syncope, 81.5 [61.9%–93.7%] epilepsy, 67.9 [47.7%–84.1%] PNES).ConclusionsA tool based on patient symptoms/comorbidities and witness reports separates well between syncope and other common causes of TLOC. It can help to differentiate epilepsy and PNES. Validated decision rules may improve diagnostic processes and reduce misdiagnosis rates.Classification of evidenceThis study provides Class III evidence that for patients with TLOC, patient and witness questionnaires discriminate between syncope, epilepsy and PNES.
- Published
- 2020
35. Novel broad-spectrum activity-based probes to profile malarial cysteine proteases
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Mateo I. Sánchez, Edgar Deu, Dara Davison, Ambrosius P. Snijders, Bethany M. Anderson, Michele S. Y. Tan, Laura E. Edgington-Mitchell, and Stephen Howell
- Subjects
0301 basic medicine ,Plasmodium ,Cell Membrane Permeability ,Cell ,Biochemistry ,Broad spectrum ,0302 clinical medicine ,Cysteine Proteases ,Medicine and Health Sciences ,Sulfones ,Amino Acids ,media_common ,Protozoans ,Chemical Biology & High Throughput ,Multidisciplinary ,biology ,Chemistry ,Organic Compounds ,Tryptophan ,Malarial Parasites ,Eukaryota ,Proteases ,3. Good health ,Enzymes ,medicine.anatomical_structure ,030220 oncology & carcinogenesis ,Physical Sciences ,Medicine ,Research Article ,Drug ,Model organisms ,media_common.quotation_subject ,Science ,Plasmodium falciparum ,Infectious Disease ,Cysteine Proteinase Inhibitors ,Biochemistry & Proteomics ,Antimalarials ,03 medical and health sciences ,Parasite Groups ,medicine ,Parasitic Diseases ,Animals ,Humans ,Sulfur Containing Amino Acids ,Cysteine ,Computational & Systems Biology ,Cathepsin ,Merozoites ,Organic Chemistry ,Organisms ,Chemical Compounds ,Correction ,Biology and Life Sciences ,Proteins ,Cell Biology ,biology.organism_classification ,Tropical Diseases ,Parasitic Protozoans ,Malaria ,Protein profiling ,030104 developmental biology ,Molecular Probes ,Enzymology ,Parasitology ,Apicomplexa - Abstract
Clan CA cysteine proteases, also known as papain-like proteases, play important roles throughout the malaria parasite life cycle and are therefore potential drug targets to treat this disease and prevent its transmission. In order to study the biological function of these proteases and to chemically validate some of them as viable drug targets, highly specific inhibitors need to be developed. This is especially challenging given the large number of clan CA proteases present in Plasmodium species (ten in Plasmodium falciparum), and the difficulty of designing selective inhibitors that do not cross-react with other members of the same family. Additionally, any efforts to develop antimalarial drugs targeting these proteases will also have to take into account potential off-target effects against the 11 human cysteine cathepsins. Activity-based protein profiling has been a very useful tool to determine the specificity of inhibitors against all members of an enzyme family. However, current clan CA proteases broad-spectrum activity-based probes either target endopeptidases or dipeptidyl aminopeptidases, but not both subfamilies efficiently. In this study, we present a new series of dipeptydic vinyl sulfone probes containing a free N-terminal tryptophan and a fluorophore at the P1 position that are able to label both subfamilies efficiently, both in Plasmodium falciparum and in mammalian cells, thus making them better broad-spectrum activity-based probes. We also show that some of these probes are cell permeable and can therefore be used to determine the specificity of inhibitors in living cells. Interestingly, we show that the choice of fluorophore greatly influences the specificity of the probes as well as their cell permeability.
- Published
- 2020
- Full Text
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36. Developing a Suite of Motion-Controlled Games for Upper Extremity Training in Children with Cerebral Palsy: A Proof-of-Concept Study
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Yao-Jen Chang, Wen Chi Wu, Jen Wen Hung, Stephen Howell, Chiung Xia Chou, and Wei Peng Lu
- Subjects
Male ,030506 rehabilitation ,Upper extremity ,Health (social science) ,Computer science ,medicine.medical_treatment ,education ,Proof of Concept Study ,Motion (physics) ,Cerebral palsy ,03 medical and health sciences ,0302 clinical medicine ,Human–computer interaction ,Surveys and Questionnaires ,medicine ,Humans ,Child ,computer.programming_language ,Kinect ,Rehabilitation ,Cerebral Palsy ,Suite ,ComputingMilieux_PERSONALCOMPUTING ,Public Health, Environmental and Occupational Health ,Original Articles ,Scratch ,Extension (predicate logic) ,medicine.disease ,Motion control ,Computer Science Applications ,Treatment Outcome ,Video Games ,Proof of concept ,Child, Preschool ,Female ,0305 other medical science ,human activities ,computer ,Psychomotor Performance ,030217 neurology & neurosurgery - Abstract
Aim: The Scratch programming language allows learner developers to write games. The Kinect2Scratch extension makes Scratch games with bodily motion control possible by connecting to Microsoft's Kinect sensor. This study examined the feasibility and possible efficacy of a suite of motion-controlled games designed for upper extremity (UE) training in children with cerebral palsy (CP) using Kinect2Scratch. Materials and Methods: This is a proof-of-concept study. We developed three games, requiring three UE movement patterns (shoulder holding, reaching, and handclap), for use in children with CP. The primary outcome was feasibility, addressed by adherence, engagement, satisfaction, and safety. The secondary outcome was efficacy, which was evaluated by Quality of Upper Extremities Skills Test (QUEST), Box and Block Test (BBT), Melbourne Assessment 2 (MA2) test, and ABILHAND-kids score. Results: Thirteen children with CP (mean age 6.9 years) received 24 sessions of training (30 minutes per session). The adherence rate was 100%. During the first 2 weeks of training, children had a significantly higher level of participation in Kinect2Scratch training than in conventional rehabilitation [Pittsburgh Participation Scale, median (interquartile range [IQR]), 6 (3–6) vs. 4 (3–6) P = 0.04]. However, during the last 2 weeks of training, there was no significant difference in participation between the Kinect2Scratch and conventional training [Pittsburgh Rehabilitation Participation Scale, median (IQR), 4 (3–5) vs. 4 (3–6) P = 0.55]. Most children enjoyed playing the games. The mean score of enjoyment was 4.54 ± 0.66. There were no adverse events during the training periods. The children had significant improvement in total score of QUEST and MA2. There were no significant improvements in BBT and ABILHAND-kids score. Conclusion: Using Kinect2Scratch games for UE training is a feasible adjunctive program for children with CP.
- Published
- 2018
37. Cognitive behavioural therapy for adults with dissociative seizures (CODES): a pragmatic, multicentre, randomised controlled trial
- Author
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Joanna Murray, Panayiota Petrochilos, Carole Eastwood, James Purnell, Elisa Bruno, R. Simkiss, J. Elvish, S. Memon, Jon Stone, M. Buckley, Lea Ludwig, Fergus J. Rugg-Gunn, Gerald T. Finnerty, D. Alvares, T. Andrews, M. Whittaker, L. Wicks, Iris Mosweu, MJ Edwards, T. Vick, H. Healy, N. Adab, S. Samarasekera, A. Morgan-Boon, R. Chalmers, Dilraj Sokhi, J. Vinnicombe, M. Chowdhury, M. Bennett, Daniel Blackburn, Robert D. C. Elwes, Mark Broadhurst, Susan Duncan, Paul McCrone, A. Meadow, D. Protheroe, G. Saldanha, L. Toplis, R. Armstrong, P. Pullicino, Lina Nashef, Nick Firth, D. Phoenix, W. Pickerell, C. Mitchell, Sofia H Eriksson, Christopher D. Graham, H. Allroggen, Christine Burness, C. Rowbottom, Dhara A. Patel, F. McKevitt, Jon M Dickson, A. M. Abe, Guru Kumar, H. Hunt, J. Thorpe, Hannah R. Cock, T. Pieters, Christopher P. Derry, Sarah J Feehan, Philip E. M. Smith, B Diehl, A. Shetty, Davide Martino, Mark H. Johnson, Jasvinder A. Singh, S. Eriemo, Nick Medford, Jananee Sivagnanasundaram, Iain Perdue, L. Teare, C. Hewamadduma, A. Miorelli, Daniel J. O’Hara, M. Bodani, Joanna Karlsson, G. Cocco, Stjepana Kovac, Gary Price, J. Knibb, R. Taylor, S. Harrison, M. Wickremaratchi, Michalis Koutroumanidis, R. Hadden, Melissa J Maguire, R. Fung, Richard Harding, S. Chong, Markus Reuber, I. Tylova, Gary Dennis, K. Evans, G. Jensch, Mark P. Richardson, F. Chowdury, S. Slaght, M. Innocente, R. Liu, R A Grünewald, C. Rockliffe-Fidler, N. Kock, A. Copping, Harriet Jordan, Elana Day, C. Walsh, Niruj Agrawal, Rohit Saha, K. Cikurel, Julie Read, T. Tahir, T. N. Mitchell, L. Page, Lorea Flores, S. Ellawella, A. Laker, V. Sanchez Sanchez, T. Webb, Sabine Landau, Sahran Higgins, Steven Kemp, A. Hussain, Jennifer Quirk, Norman Poole, Guy D. Leschziner, Killian A. Welch, Alice Brockington, L. Suvorova, A. McGorlick, Stephen Howell, Nandini Mullatti, Alastair M Santhouse, Manny Bagary, Heather Angus-Leppan, V. Moffitt, J. Moriarty, T. Black, K. Scholes, Hannah Callaghan, R. Faruqui, M. Baldellou Lopez, Matthew C. Walker, S. Cope, B. Ridha, Trudie Chalder, R. Devlin, M. Tsakopoulou, Biba R. Stanton, Bridget K MacDonald, C M Ellis, J. Aram, C. Donnelly, Nicholas Moran, A.R.C. Kelso, K. Weyrich, Z. Green-Thompson, Louise Oakley, Emily J. Robinson, Paula Gardiner, A. Atalaia, S. Cooper, G. Watson, Marco Mula, D. Lozsadi, S. Rajakulendran, John D. C. Mellers, S. O'Sullivan, M. Manford, Tim Wehner, Alan Carson, S. Harikrishnan, Izabela Pilecka, K. McKeown, Mahinda Yogarajah, James T. Teo, L. Tedesco, R. Delamont, Dougall McCorry, Khalid Hamandi, Laura H. Goldstein, Lindsey Macgregor, Michele Moore, Paul Shotbolt, and A. Sachar
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Adult ,Male ,Pediatrics ,medicine.medical_specialty ,Visual analogue scale ,Population ,Dissociative Disorders ,Rate ratio ,Severity of Illness Index ,law.invention ,03 medical and health sciences ,Epilepsy ,0302 clinical medicine ,Quality of life ,Randomized controlled trial ,law ,Seizures ,Severity of illness ,Medicine ,Humans ,030212 general & internal medicine ,education ,Biological Psychiatry ,Psychiatric Status Rating Scales ,education.field_of_study ,Depressive Disorder ,Wales ,Cognitive Behavioral Therapy ,business.industry ,Middle Aged ,medicine.disease ,030227 psychiatry ,Intention to Treat Analysis ,Psychiatry and Mental health ,Treatment Outcome ,England ,Scotland ,Patient Satisfaction ,RC Internal medicine ,Quality of Life ,Female ,business ,Psychosocial - Abstract
Background\ud Dissociative seizures are paroxysmal events resembling epilepsy or syncope with characteristic features that allow them to be distinguished from other medical conditions. We aimed to compare the effectiveness of cognitive behavioural therapy (CBT) plus standardised medical care with standardised medical care alone for the reduction of dissociative seizure frequency.\ud \ud Methods\ud In this pragmatic, parallel-arm, multicentre randomised controlled trial, we initially recruited participants at 27 neurology or epilepsy services in England, Scotland, and Wales. Adults (≥18 years) who had dissociative seizures in the previous 8 weeks and no epileptic seizures in the previous 12 months were subsequently randomly assigned (1:1) from 17 liaison or neuropsychiatry services following psychiatric assessment, to receive standardised medical care or CBT plus standardised medical care, using a web-based system. Randomisation was stratified by neuropsychiatry or liaison psychiatry recruitment site. The trial manager, chief investigator, all treating clinicians, and patients were aware of treatment allocation, but outcome data collectors and trial statisticians were unaware of treatment allocation. Patients were followed up 6 months and 12 months after randomisation. The primary outcome was monthly dissociative seizure frequency (ie, frequency in the previous 4 weeks) assessed at 12 months. Secondary outcomes assessed at 12 months were: seizure severity (intensity) and bothersomeness; longest period of seizure freedom in the previous 6 months; complete seizure freedom in the previous 3 months; a greater than 50% reduction in seizure frequency relative to baseline; changes in dissociative seizures (rated by others); health-related quality of life; psychosocial functioning; psychiatric symptoms, psychological distress, and somatic symptom burden; and clinical impression of improvement and satisfaction. p values and statistical significance for outcomes were reported without correction for multiple comparisons as per our protocol. Primary and secondary outcomes were assessed in the intention-to-treat population with multiple imputation for missing observations. This trial is registered with the International Standard Randomised Controlled Trial registry, ISRCTN05681227, and ClinicalTrials.gov, NCT02325544.\ud \ud Findings\ud Between Jan 16, 2015, and May 31, 2017, we randomly assigned 368 patients to receive CBT plus standardised medical care (n=186) or standardised medical care alone (n=182); of whom 313 had primary outcome data at 12 months (156 [84%] of 186 patients in the CBT plus standardised medical care group and 157 [86%] of 182 patients in the standardised medical care group). At 12 months, no significant difference in monthly dissociative seizure frequency was identified between the groups (median 4 seizures [IQR 0–20] in the CBT plus standardised medical care group vs 7 seizures [1–35] in the standardised medical care group; estimated incidence rate ratio [IRR] 0·78 [95% CI 0·56–1·09]; p=0·144). Dissociative seizures were rated as less bothersome in the CBT plus standardised medical care group than the standardised medical care group (estimated mean difference −0·53 [95% CI −0·97 to −0·08]; p=0·020). The CBT plus standardised medical care group had a longer period of dissociative seizure freedom in the previous 6 months (estimated IRR 1·64 [95% CI 1·22 to 2·20]; p=0·001), reported better health-related quality of life on the EuroQoL-5 Dimensions-5 Level Health Today visual analogue scale (estimated mean difference 6·16 [95% CI 1·48 to 10·84]; p=0·010), less impairment in psychosocial functioning on the Work and Social Adjustment Scale (estimated mean difference −4·12 [95% CI −6·35 to −1·89]; p
- Published
- 2019
38. Factors Impacting Ticket Price Paid by Consumers on the Secondary Market for a Major Sporting Event
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Patrick Walsh, Stephen L. Shapiro, Stephen Howell, Chad D. McEvoy, Nels Popp, and Jason M. Simmons
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Basketball ,Variables ,Work (electrical) ,Willingness to pay ,media_common.quotation_subject ,Dynamic pricing ,Attendance ,Variance (accounting) ,Secondary market ,Business ,Marketing ,media_common - Abstract
In an era of dynamically priced tickets, sport marketers benefit from a greater understanding of factors impacting the price consumers are willing to pay. Past research has investigated external factors affecting ticket price on the secondary market, but little work has investigated internal factors and no prior research has utilized actual price paid as a dependent variable. The current study found age, income, prior attendance, timing of purchase, and seat location influenced secondary ticket price paid, explaining 44.9% of the variance, while fan identification and alumni status did not impact the amount patrons paid for tickets to a major college men’s basketball tournament. Subscribe to JASM
- Published
- 2018
39. Looking Back, Moving Forward: A Retrospective Review of Care Trends in an Academic Palliative and Supportive Care Program from 2004 to 2016
- Author
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Chao Hui Sylvia Huang, Rodney Tucker, Jennifer L. Hicks, Ashley Nichols, Jackie Palmore, J. Nicholas Dionne-Odom, Stephen Howell, Gisella Mancarella, Oladele Osisami, Gulcan Bagcivan, Marie Bakitas, and Elizabeth Kvale
- Subjects
Adult ,Male ,medicine.medical_specialty ,Palliative care ,Adolescent ,03 medical and health sciences ,Young Adult ,0302 clinical medicine ,030502 gerontology ,medicine ,Humans ,Longitudinal Studies ,Child ,General Nursing ,Depressive symptoms ,Aged ,Retrospective Studies ,Aged, 80 and over ,Retrospective review ,Academic Medical Centers ,business.industry ,Do not resuscitate ,Palliative Care ,Infant, Newborn ,Infant ,General Medicine ,Emergency department ,Middle Aged ,Anesthesiology and Pain Medicine ,Cross-Sectional Studies ,Median time ,030220 oncology & carcinogenesis ,Family medicine ,Child, Preschool ,Hospice and Palliative Care Nursing ,Alabama ,Brief Reports ,Female ,Rural Health Services ,0305 other medical science ,business ,Care program ,Rural population ,Forecasting - Abstract
Objective: To examine a rural-serving HBPC program's 12-year experience and historical trends to inform future program direction and expansion. Background: There is limited information about longitudinal trends in mature hospital-based palliative care (HBPC) programs serving racially diverse rural populations. Methods: This is a retrospective cross-sectional study of operational and patient-reported outcomes from the University of Alabama at Birmingham (UAB) Center for Palliative and Supportive Care (CPSC) inpatient (n=11,786) and outpatient (n=315) databases from October 2004 to March 2016. Results: Inpatients were a mean age of 63.7 years, male (50.1%), white (62.3%), general medicine referred (19.5%), primarily for goals of care (84.4%); 47.1% had "do not resuscitate/do not intubate" status and 46.9% were transferred to the Palliative Care and Comfort Unit (PCCU) after consultation. Median time from admission to consultation was three days, median PCCU length of stay (LOS) was four days, and median hospital LOS was nine days. Increased emergency department and cardiology referrals were notable in later years. Outpatients' mean age was 53.02 years, 63.5% were female, 76.8% were white, and 75.6% had a cancer diagnosis. Fatigue, pain, and disturbed sleep were the most common symptoms at the time of the visit; 34.6% reported mild-to-moderate depressive symptoms. Of patients reporting pain (64.8%), one-third had 50% or less relief from pain treatment. Discussion: The CPSC, which serves a racially diverse rural population, has demonstrated robust growth. We are poised to scale and spread our lessons learned to underserved communities.
- Published
- 2019
40. Comparison of Kinect2Scratch game-based training and therapist-based training for the improvement of upper extremity functions of patients with chronic stroke: a randomized controlled single-blinded trial
- Author
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Stephen Howell, Wen Chi Wu, Chiung-Xia Chou, Ching-yi Wu, Jen-Wen Hung, Yao-Jen Chang, and Ku-chou Chang
- Subjects
Male ,medicine.medical_specialty ,medicine.medical_treatment ,Population ,Physical Therapy, Sports Therapy and Rehabilitation ,Session (web analytics) ,law.invention ,Upper Extremity ,Disability Evaluation ,Randomized controlled trial ,law ,Intervention (counseling) ,medicine ,Humans ,Single-Blind Method ,education ,Stroke ,Aged ,education.field_of_study ,Rehabilitation ,business.industry ,Stroke Rehabilitation ,Virtual Reality ,Recovery of Function ,Middle Aged ,medicine.disease ,Test (assessment) ,Video Games ,Chronic Disease ,Physical therapy ,Female ,business ,human activities - Abstract
Background Virtual reality and interactive video games could decrease the demands on the time of the therapists. However, the cost of a virtual reality system and the requirement for technical support limits the availability of these systems. Commercial exergames are not specifically designed for therapeutic use, most patients with hemiplegic stroke are either too weak to play the games or develop undesirable compensatory movements. Aim To develop Kinect2Scratch games and compare the effects of training with therapist-based training on upper extremity (UE) function of patients with chronic stroke. Design A randomized controlled single-blinded trial. Setting An outpatient rehabilitation clinic of a tertiary hospital. Population Thirty-three patients with chronic hemiplegic stroke. Methods We developed 8 Kinect2Scratch games. The participants were randomly assigned to either a Kinect2Scratch game group or a therapist-based training group. The training comprised 24 sessions of 30 minutes over 12 weeks. The primary outcome measure was the Fugl-Meyer UE scale and the secondary outcome measures were the Wolf Motor Function Test and Motor Activity Log. Patients were assessed at baseline, after intervention, and at the 3-month follow-up. We used the Pittsburgh participation scale (PPS) to assess the participation level of patients at each training session and an accelerometer to assess the activity counts of the affected UE of patients was used at the 12th and 24th training sessions. Results Seventeen patients were assigned to the Kinect2Scratch group and 16 were assigned to the therapist-based training group. There were no differences between the two groups for any of the outcome measures postintervention and at the 3-month follow-up (all P>0.05). The level of participation was higher in the Kinect2Scratch group than in the therapist-based training group (PPS 5.25 vs. 5.00, P=0.112). The total activity counts of the affected UE was significantly higher in the Kinect2Scratch group than in the therapist-based training group (P Conclusions Kinect2Scratch game training was feasible, with effects similar to those of therapist-based training on UE function of patients with chronic stroke. Clinical rehabilitation impact Kinect2Scratch games are low-cost and easily set-up games, which may serve as a complementary strategy to conventional therapy to decrease therapists' work load.
- Published
- 2019
41. Review of Player Personality Classifications to Inform Game Design
- Author
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Stephen Howell, John O'Mullane, Philip Bourke, Kevin Marshall, and David Murphy
- Subjects
Mood ,Game design ,Personality type ,media_common.quotation_subject ,ComputingMilieux_PERSONALCOMPUTING ,Entertainment industry ,Personality ,Persona ,User interface ,Big Five personality traits ,Psychology ,Cognitive psychology ,media_common - Abstract
Studies have been completed which attempt to detect players' sentiment, and intensify game-play immersion. Emotions, while an indicator of experience, have been proposed to be 'reactive predictions' by the player, during interactions in game-play. Designers arrange core game-play mechanics, visuals and audio atmosphere to create mood. This arrangement of content and mechanics is crucial to ensuring the majority of players correctly choose an emotional context and feel the intended emotion based on stimuli. The proposed work is to identify classifications for players and contexts that improve player sensation thereby deepening game-play immersion, both vicarious and visceral immersion. A player's personality type influences their engagement with game genres and gameplay. The goal of proposed work is to assist designers in understanding the player personality type and design principals that address the preferences of these types. The game experience and user interface can be adapted to better suit a particular type. Players can also adopt a persona differing from their personality traits and this can also have positive outcomes in terms of immersion and engagement with the game and other players.
- Published
- 2018
42. Phenytoin-related ataxia in patients with epilepsy: clinical and radiological characteristics
- Author
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Daniel Aeschlimann, Pascale Aeschlimann, Priya D. Shanmugarajah, Markus Reuber, Nigel Hoggard, Stephen Howell, Richard A. Grünewald, Gary Dennis, and Marios Hadjivassiliou
- Subjects
Male ,Phenytoin ,Cerebellum ,Pediatrics ,medicine.medical_specialty ,Ataxia ,medicine.medical_treatment ,Neuroimaging ,Neurological examination ,Antibodies ,Gliadin ,03 medical and health sciences ,Epilepsy ,Folic Acid ,0302 clinical medicine ,GTP-Binding Proteins ,medicine ,Cerebellar Degeneration ,Humans ,Protein Glutamine gamma Glutamyltransferase 2 ,Longitudinal Studies ,030212 general & internal medicine ,Neurologic Examination ,Transglutaminases ,medicine.diagnostic_test ,Cerebellar ataxia ,business.industry ,Brain ,General Medicine ,medicine.disease ,medicine.anatomical_structure ,Anticonvulsant ,Neurology ,Sensation Disorders ,Anticonvulsants ,Female ,Neurology (clinical) ,medicine.symptom ,business ,030217 neurology & neurosurgery ,medicine.drug - Abstract
Purpose\ud \ud \ud Phenytoin is an effective anticonvulsant for focal epilepsy. Its use can be associated with long-term adverse effects including cerebellar ataxia. Whilst phenytoin is toxic to Purkinje cells in vitro; the clinical and radiological phenotype and mechanism of cerebellar degeneration in vivo remain unclear. We describe the prevalence, clinical and radiological characteristics of phenytoin-related ataxia.\ud \ud \ud \ud Methods\ud \ud \ud Patients with epilepsy receiving treatment with phenytoin were recruited from the Epilepsy clinics at Royal Hallamshire Hospital, Sheffield, UK. Neurological examination was performed on all patients after recruitment. Patients were categorised into those with and without ataxia. We determined the severity of ataxia clinically (SARA score) and the pattern of cerebellar involvement by neuroimaging (MRI volumetry and MR spectroscopy).\ud \ud \ud \ud Results\ud \ud \ud Forty-seven patients were recruited. Median duration of epilepsy was 24 years, median duration of phenytoin treatment was 15 years and current median phenytoin daily dose was 325 mg. Fifty-five percent of patients complained of poor balance. Clinical evidence of ataxia was seen in 40% patients. Gait, stance and heel-shin slide were the predominant features of cerebellar dysfunction. MRI demonstrated structural, volumetric and functional deficits of the cerebellum. Only one patient with ataxia had phenytoin levels above the normal range.\ud \ud \ud \ud Conclusions\ud \ud \ud Cerebellar ataxia is present in 40% of patients with epilepsy and chronic exposure to phenytoin. Patients on long-term phenytoin have reduced cerebellar volume even if they have no clinical evidence of ataxia. Evidence of structural deficits on imaging suggests a predilection for vermian involvement.
- Published
- 2018
43. Constraints of philanthropy on determining the distribution of biodiversity conservation funding
- Author
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Stephen Howell, Peter Kareiva, Eric Larson, and Paul R. Armsworth
- Subjects
0106 biological sciences ,Ecology ,Natural resource economics ,business.industry ,Land trust ,Biodiversity ,Distribution (economics) ,010501 environmental sciences ,010603 evolutionary biology ,01 natural sciences ,Habitat destruction ,Return on investment ,Liberian dollar ,Business ,Protected area ,Organizational effectiveness ,Ecology, Evolution, Behavior and Systematics ,0105 earth and related environmental sciences ,Nature and Landscape Conservation - Abstract
Caught between ongoing habitat destruction and funding shortfalls, conservation organizations are using systematic planning approaches to identify places that offer the highest biodiversity return per dollar invested. However, available tools do not account for the landscape of funding for conservation or quantify the constraints this landscape imposes on conservation outcomes. Using state-level data on philanthropic giving to and investments in land conservation by a large nonprofit organization, we applied linear regression to evaluate whether the spatial distribution of conservation philanthropy better explained expenditures on conservation than maps of biodiversity priorities, which were derived from a planning process internal to the organization and return on investment (ROI) analyses based on data on species richness, land costs, and existing protected areas. Philanthropic fund raising accounted for considerably more spatial variation in conservation spending (r(2) = 0.64) than either of the 2 systematic conservation planning approaches (r(2) = 0.08-0.21). We used results of one of the ROI analyses to evaluate whether increases in flexibility to reallocate funding across space provides conservation gains. Small but plausible "tax" increments of 1-10% on states redistributed to the optimal funding allocation from the ROI analysis could result in gains in endemic species protected of 8.5-80.2%. When such increases in spatial flexibility are not possible, conservation organizations should seek to cultivate increased support for conservation in priority locations. We used lagged correlations of giving to and spending by the organization to evaluate whether investments in habitat protection stimulate future giving to conservation. The most common outcome at the state level was that conservation spending quarters correlated significantly and positively with lagged fund raising quarters. In effect, periods of high fund raising for biodiversity followed (rather than preceded) periods of high expenditure on land conservation projects, identifying one mechanism conservation organizations could explore to seed greater activity in priority locations. Our results demonstrate how limitations on the ability of conservation organizations to reallocate their funding across space can impede organizational effectiveness and elucidate ways conservation planning tools could be more useful if they quantified and incorporated these constraints.
- Published
- 2015
44. Some Challenges Posed by Coal Bed Methane Regional Assessment Modeling
- Author
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Catherine Moore, Leon Erriah, John Doherty, and Stephen Howell
- Subjects
Geological Phenomena ,Engineering ,Water Wells ,Aquifer ,Methane ,chemistry.chemical_compound ,Coal ,Extraction (military) ,Computers in Earth Sciences ,Groundwater ,Water Science and Technology ,geography ,geography.geographical_feature_category ,Petroleum engineering ,business.industry ,Coal mining ,Coal measures ,Models, Theoretical ,chemistry ,Queensland ,Hydrology ,business ,Groundwater model - Abstract
Coal measures (coal bearing rock strata) can contain large reserves of methane. These reserves are being exploited at a rapidly increasing rate in many parts of the world. To extract coal seam gas, thousands of wells are drilled at relatively small spacing to depressurize coal seams to induce desorption and allow subsequent capture of the gas. To manage this process effectively, the effect of coal bed methane (CBM) extraction on regional aquifer systems must be properly understood and managed. Groundwater modeling is an integral part of this management process. However, modeling of CBM impacts presents some unique challenges, as processes that are operative at two very different scales must be adequately represented in the models. The impacts of large-scale gas extraction may be felt over a large area, yet despite the significant upscaling that accompanies construction of a regional model, near-well conditions and processes cannot be ignored. These include the highly heterogeneous nature of many coal measures, and the dual-phase flow of water and gas that is induced by coal seam depressurization. To understand these challenges, a fine-scale model was constructed incorporating a detailed representation of lithological heterogeneity to ensure that near-well processes and conditions could be examined. The detail of this heterogeneity was at a level not previously employed in models built to assess groundwater impacts arising from CBM extraction. A dual-phase reservoir simulator was used to examine depressurization and water desaturation processes in the vicinity of an extractive wellfield within this fine-scale model. A single-phase simulator was then employed so that depressurization errors incurred by neglecting near-well, dual-phase flow could be explored. Two models with fewer lithological details were then constructed in order to examine the nature of depressurization errors incurred by upscaling and to assess the interaction of the upscaling process with the requirement for adequate representation of near-source, dual-phase processes.
- Published
- 2014
45. A genome-wide association study and biological pathway analysis of epilepsy prognosis in a prospective cohort of newly treated epilepsy
- Author
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Raju Yerra, Andrea L. Jorgensen, Mark Kellett, Alison J. Coffey, Paul N Cooper, Margaret Jackson, Hariklia Eleftherohorinou, Terence J. O'Brien, Christopher A. French, Marvin Johnson, Samuel F. Berkovic, Maria De Iorio, David Bentley, Marian Todaro, Tisham De, David Chadwick, Ioanna Tachmazidou, David F. Smith, Munir Pirmohamed, Doug Speed, Clive J. Hoggart, Graeme E. Sills, Philip E. M. Smith, Aarno Palotie, Markus Reuber, Anthony G Marson, David J. Balding, Slavé Petrovski, Stephen Howell, Ingrid E. Scheffer, Meng Tan, and Mark R Newton
- Subjects
Adult ,Male ,medicine.medical_specialty ,Population ,Lamotrigine ,Biology ,Pharmacology ,Phosphatidylinositols ,Polymorphism, Single Nucleotide ,law.invention ,Young Adult ,Epilepsy ,Randomized controlled trial ,law ,Internal medicine ,Genetics ,medicine ,Humans ,Genetic Predisposition to Disease ,Calcium Signaling ,Prospective Studies ,education ,Prospective cohort study ,Molecular Biology ,Genetics (clinical) ,Chromosomes, Human, Pair 15 ,education.field_of_study ,Association Studies Articles ,Genetic Variation ,General Medicine ,Carbamazepine ,Middle Aged ,Prognosis ,Drug Resistant Epilepsy ,medicine.disease ,Treatment Outcome ,Cohort ,Anticonvulsants ,Chromosomes, Human, Pair 6 ,Female ,Chromosomes, Human, Pair 9 ,Genome-Wide Association Study ,medicine.drug - Abstract
We present the analysis of a prospective multicentre study to investigate genetic effects on the prognosis of newly treated epilepsy. Patients with a new clinical diagnosis of epilepsy requiring medication were recruited and followed up prospectively. The clinical outcome was defined as freedom from seizures for a minimum of 12 months in accordance with the consensus statement from the International League Against Epilepsy (ILAE). Genetic effects on remission of seizures after starting treatment were analysed with and without adjustment for significant clinical prognostic factors, and the results from each cohort were combined using a fixed-effects meta-analysis. After quality control (QC), we analysed 889 newly treated epilepsy patients using 472 450 genotyped and 6.9 × 10(6) imputed single-nucleotide polymorphisms. Suggestive evidence for association (defined as Pmeta5.0 × 10(-7)) with remission of seizures after starting treatment was observed at three loci: 6p12.2 (rs492146, Pmeta = 2.1 × 10(-7), OR[G] = 0.57), 9p23 (rs72700966, Pmeta = 3.1 × 10(-7), OR[C] = 2.70) and 15q13.2 (rs143536437, Pmeta = 3.2 × 10(-7), OR[C] = 1.92). Genes of biological interest at these loci include PTPRD and ARHGAP11B (encoding functions implicated in neuronal development) and GSTA4 (a phase II biotransformation enzyme). Pathway analysis using two independent methods implicated a number of pathways in the prognosis of epilepsy, including KEGG categories 'calcium signaling pathway' and 'phosphatidylinositol signaling pathway'. Through a series of power curves, we conclude that it is unlikely any single common variant explains4.4% of the variation in the outcome of newly treated epilepsy.
- Published
- 2013
46. Prevalence of neurologic autoantibodies in cohorts of patients with new and established epilepsy
- Author
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Tanja Brenner, Stephen Howell, Angela Vincent, Y Hart, Martin J. Brodie, Patrick Waters, Bethan Lang, and Graeme J. Sills
- Subjects
Adult ,Male ,medicine.medical_specialty ,Pathology ,Adolescent ,Cross-sectional study ,Glutamate decarboxylase ,Radioimmunoassay ,Nerve Tissue Proteins ,Receptors, N-Methyl-D-Aspartate ,Young Adult ,Epilepsy ,Receptors, Glycine ,Antigen ,Internal medicine ,Prevalence ,medicine ,Humans ,Young adult ,Aged ,Autoantibodies ,Aged, 80 and over ,biology ,Glutamate Decarboxylase ,business.industry ,Autoantibody ,Case-control study ,Middle Aged ,medicine.disease ,Cross-Sectional Studies ,Neurology ,Potassium Channels, Voltage-Gated ,Case-Control Studies ,biology.protein ,Female ,Neurology (clinical) ,Antibody ,business - Abstract
Summary Purpose Autoantibodies to specific neurologic proteins are associated with subacute onset encephalopathies, which often present with seizures that are poorly controlled by conventional antiepileptic drugs (AEDs). Previous cross-sectional studies have found specific neurologic antibodies in a small proportion of people with established epilepsy, but these investigations have seldom included patients with recent diagnosis. Methods We screened two large epilepsy cohorts to investigate the prevalence of multiple autoantibodies in adult patients with either established or newly diagnosed, untreated epilepsy. Key Findings Eleven percent of patients had antibodies to one or more antigen: voltage-gated potassium channel (VGKC) complex proteins (5%), glycine receptors (3%), and glutamic acid decarboxylase (GAD) and N-methyl-d-aspartate (NMDA) receptors (1.7% each). There was no difference in the prevalence of antibodies, individually or collectively, between patients with established and newly diagnosed epilepsy or with generalized or focal epilepsy. There was, however, a significantly higher prevalence of positive antibody titers in patients with focal epilepsy of unknown cause than in those with structural/metabolic focal epilepsy (14.8% vs. 6.3%; p
- Published
- 2013
47. Integration of Palliative Care in the Hospital Setting
- Author
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Rodney Tucker, Stephen Howell, and Colin Wozencraft
- Subjects
System development ,Palliative care ,Nursing ,business.industry ,Hospital setting ,Health care ,Medicine ,Context (language use) ,business ,Medical culture ,Pace - Abstract
Palliative medicine has shown demonstrated benefit for patients with serious illness, their families, and hospital systems. As such, the demand for palliative care services is growing at a fast pace, and health care facilities frequently struggle to develop and implement effective and sustainable methods of providing this care. As with any new system, challenges and barriers naturally exist to instituting palliative care. Undertaking careful assessment, planning, and resource allocation can provide the greatest likelihood of success when developing these novel yet much needed models of care. This summary paper offers a qualitative overview of the potential benefits and the rationale to implement robust palliative care systems. We briefly review the history of palliative medicine in the broadest sense and address several seminal works from the US palliative care literature. Core practices to establish and advance palliative medicine are suggested. Commentary is provided on some of the particular barriers to palliative system development that may need to be addressed in the context of Korean medical culture. Collectively, we hope this overview can contribute to a framework within which such research and development can occur, leading to increasingly effective and sustainable palliative medicine in Korea.
- Published
- 2012
48. Panic symptoms in transient loss of consciousness: Frequency and diagnostic value in psychogenic nonepileptic seizures, epilepsy and syncope
- Author
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Steve W Parry, Markus Reuber, Matthias J. Koepp, G.H. Rawlings, Matthew C. Walker, Mark Broadhurst, Jenny Jamnadas-Khoda, Stephen Howell, R A Grünewald, and Sanjay M. Sisodiya
- Subjects
Adult ,Male ,medicine.medical_specialty ,media_common.quotation_subject ,Unconsciousness ,behavioral disciplines and activities ,Syncope ,Diagnosis, Differential ,03 medical and health sciences ,Epilepsy ,0302 clinical medicine ,Seizures ,Surveys and Questionnaires ,mental disorders ,medicine ,Psychogenic disease ,Humans ,Ictal ,Psychiatry ,media_common ,biology ,Panic disorder ,Syncope (genus) ,Panic ,General Medicine ,Middle Aged ,medicine.disease ,biology.organism_classification ,030227 psychiatry ,Neurology ,Anxiety ,Panic Disorder ,Female ,Neurology (clinical) ,Self Report ,medicine.symptom ,Consciousness ,Psychology ,030217 neurology & neurosurgery - Abstract
Previous studies suggest that ictal panic symptoms are common in patients with psychogenic nonepileptic seizures (PNES). This study investigates the frequency of panic symptoms in PNES and if panic symptoms, just before or during episodes, can help distinguish PNES from the other common causes of transient loss of consciousness (TLOC), syncope and epilepsy.Patients with secure diagnoses of PNES (n=98), epilepsy (n=95) and syncope (n=100) were identified using clinical databases from three United Kingdom hospitals. Patients self-reported the frequency with which they experienced seven symptoms of panic disorder in association with their episodes. A composite panic symptom score was calculated on the basis of the frequency of symptoms.8.2% of patients with PNES reported "never" experiencing any of the seven panic symptoms in their episodes of TLOC. Patients with PNES reported more frequent panic symptoms in their attacks than those with epilepsy (p0.001) or syncope (p0.001), however, patients with PNES were more likely "rarely" or "never" to report five of the seven-ictal panic symptoms than "frequently" or "always" (45-69% versus 13-29%). A receiver operating characteristic analysis demonstrated that the composite panic symptom score distinguished patients with PNES from the other groups (sensitivity 71.1%, specificity 71.2%), but not epilepsy from syncope.Patients with PNES report TLOC associated panic symptoms more commonly than those with epilepsy or syncope. Although panic symptoms are reported infrequently by most patients with PNES, a composite symptom score may contribute to the differentiation between PNES and the other two common causes of TLOC.
- Published
- 2016
49. Manuscript with changes makred in red
- Author
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Stephen Howell
- Published
- 2016
50. Reponse to Reviewer 1
- Author
-
Stephen Howell
- Published
- 2016
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