73 results on '"David C. Spencer"'
Search Results
2. Southern African Journal of HIV Medicine August 2021
- Author
-
David C. Spencer
- Subjects
unaids targets for 2030 ,hiv/aids ,southern africa ,2030 ,21st anniversary ,southern african hiv clinicians’ society ,Public aspects of medicine ,RA1-1270 ,Infectious and parasitic diseases ,RC109-216 - Abstract
No abstract available.
- Published
- 2021
- Full Text
- View/download PDF
3. Editorial
- Author
-
David C. Spencer
- Subjects
Public aspects of medicine ,RA1-1270 ,Infectious and parasitic diseases ,RC109-216 - Abstract
No Abstract available.
- Published
- 2020
- Full Text
- View/download PDF
4. Infectious disease consultations at a South African academic hospital: A 6-month assessment of inpatient consultations
- Author
-
Lauren Richards, David C. Spencer, Jeremy S. Nel, and Prudence Ive
- Subjects
infectious diseases ,inpatient ,consultations ,south africa ,hiv ,tb. ,Infectious and parasitic diseases ,RC109-216 - Abstract
Background: Infectious diseases (IDs) dominate the disease profile in South Africa (SA) and the ID department is increasingly valuable. There has been little evaluation of the IDs consultation services in SA hospitals. Methods: A qualitative review of ID inpatient consultations was performed over 6 months at a SA tertiary hospital. Prospectively entered data from each consultation were recorded on a computerised database and retrospectively analysed. Results: 749 ID consultations were analysed, 4.8% of hospital admissions. Most consultations included initiation of antiretroviral therapy (ART) (27.8%), lipoarabinomannan antigen testing (24.8%) and change of ART (21.6%). Of patients reviewed, 93.3% were human immunodeficiency virus (HIV) positive and the median CD4 count was 52 cells/mm3. The infectious diagnoses (excluding HIV) most frequently encountered were pulmonary and abdominal tuberculosis (TB) and acute gastroenteritis. When all subcategories of TB infection were combined, 42.9% were found to have TB. Patients had predominantly one (45.4%) or two (30.2%) infectious diagnoses in addition to HIV. Some (12%) had three infectious diagnoses during their admission. The number of diagnoses, both infectious (odds ratio [OR] 2.00; 95% confidence interval [CI] 1.11–3.60) and non-infectious (OR 2.27; 95% CI 1.25–4.11), was associated with increased odds of death. Conclusion: The IDs department sees a high volume of patients compared to most developed countries. HIV, TB and their management dominate the workload. This study shows that HIV patients still have significant morbidity and mortality. The complexity of these patients indicates that specific expertise is required beyond that of the general physician.
- Published
- 2020
- Full Text
- View/download PDF
5. The Editor’s review of articles published from August to December 2019 in the Southern African Journal of HIV Medicine
- Author
-
David C. Spencer
- Subjects
Public aspects of medicine ,RA1-1270 ,Infectious and parasitic diseases ,RC109-216 - Abstract
No abstract available.
- Published
- 2020
- Full Text
- View/download PDF
6. Dr Dennis Sifris: In memorium
- Author
-
David C. Spencer
- Subjects
memorium ,pioneer ,dr dennis sifris ,hiv in south africa ,medical community ,Public aspects of medicine ,RA1-1270 ,Infectious and parasitic diseases ,RC109-216 - Abstract
No abstract available.
- Published
- 2020
- Full Text
- View/download PDF
7. Mentored peer review of standardized manuscripts as a teaching tool for residents: a pilot randomized controlled multi-center study
- Author
-
Victoria S. S. Wong, Roy E. Strowd, Rebeca Aragón-García, Yeseon Park Moon, Blair Ford, Sheryl R. Haut, Joseph S. Kass, Zachary N. London, MaryAnn Mays, Tracey A. Milligan, Raymond S. Price, Patrick S. Reynolds, Linda M. Selwa, David C. Spencer, and Mitchell S. V. Elkind
- Subjects
Peer review ,Training ,Education ,Medical residency ,General Works - Abstract
Abstract Background There is increasing need for peer reviewers as the scientific literature grows. Formal education in biostatistics and research methodology during residency training is lacking. In this pilot study, we addressed these issues by evaluating a novel method of teaching residents about biostatistics and research methodology using peer review of standardized manuscripts. We hypothesized that mentored peer review would improve resident knowledge and perception of these concepts more than non-mentored peer review, while improving review quality. Methods A partially blinded, randomized, controlled multi-center study was performed. Seventy-eight neurology residents from nine US neurology programs were randomized to receive mentoring from a local faculty member or not. Within a year, residents reviewed a baseline manuscript and four subsequent manuscripts, all with introduced errors designed to teach fundamental review concepts. In the mentored group, mentors discussed completed reviews with residents. Primary outcome measure was change in knowledge score between pre- and post-tests, measuring epidemiology and biostatistics knowledge. Secondary outcome measures included level of confidence in the use and interpretation of statistical concepts before and after intervention, and RQI score for baseline and final manuscripts. Results Sixty-four residents (82%) completed initial review with gradual decline in completion on subsequent reviews. Change in primary outcome, the difference between pre- and post-test knowledge scores, did not differ between mentored (−8.5%) and non-mentored (−13.9%) residents (p = 0.48). Significant differences in secondary outcomes (using 5-point Likert scale, 5 = strongly agree) included mentored residents reporting enhanced understanding of research methodology (3.69 vs 2.61; p = 0.001), understanding of manuscripts (3.73 vs 2.87; p = 0.006), and application of study results to clinical practice (3.65 vs 2.78; p = 0.005) compared to non-mentored residents. There was no difference between groups in level of interest in peer review (3.00 vs 3.09; p = 0.72) or the quality of manuscript review assessed by the Review Quality Instrument (RQI) (3.25 vs 3.06; p = 0.50). Conclusions We used mentored peer review of standardized manuscripts to teach biostatistics and research methodology and introduce the peer review process to residents. Though knowledge level did not change, mentored residents had enhanced perception in their abilities to understand research methodology and manuscripts and apply study results to clinical practice.
- Published
- 2017
- Full Text
- View/download PDF
8. Palliative care guidelines for the management of HIV-infected people in South Africa
- Author
-
David C. Spencer, René Krause, Theresa Rossouw, Mahomed-Yunus S. Moosa, Selma Browde, Esnath Maramba, Lauren Jankelowitz, Muhangwi B. Mulaudzi, Mpho Ratishikana-Moloko, Oluwarotimi F. Modupe, and Adam Mahomed
- Subjects
Public aspects of medicine ,RA1-1270 ,Infectious and parasitic diseases ,RC109-216 - Abstract
No abstract available.
- Published
- 2019
- Full Text
- View/download PDF
9. Editorial
- Author
-
David C. Spencer
- Subjects
Public aspects of medicine ,RA1-1270 ,Infectious and parasitic diseases ,RC109-216 - Abstract
No abstract available.
- Published
- 2019
- Full Text
- View/download PDF
10. HIV-Associated Disseminated Emmonsiosis, Johannesburg, South Africa
- Author
-
Wesley G. van Hougenhouck-Tulleken, Nectarios S. Papavarnavas, Jeremy S. Nel, Lauren Y. Blackburn, Nelesh P. Govender, David C. Spencer, and Christopher K. Lippincott
- Subjects
Emmonsia sp. ,emmonsiosis ,HIV-associated ,fungal infection ,South Africa ,adiaspiromycosis ,Medicine ,Infectious and parasitic diseases ,RC109-216 - Published
- 2014
- Full Text
- View/download PDF
11. Exercise, Air Pollution, and Brain Health
- Author
-
David C. Spencer
- Subjects
Neurology (clinical) - Published
- 2022
- Full Text
- View/download PDF
12. The Editor’s review of articles published from August to December 2019 in the Southern African Journal of HIV Medicine
- Author
-
David C. Spencer
- Subjects
2019-20 coronavirus outbreak ,medicine.medical_specialty ,education.field_of_study ,Coronavirus disease 2019 (COVID-19) ,business.industry ,Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) ,lcsh:Public aspects of medicine ,Population ,Human immunodeficiency virus (HIV) ,lcsh:RA1-1270 ,medicine.disease_cause ,medicine.disease ,Editorial ,Infectious Diseases ,Acquired immunodeficiency syndrome (AIDS) ,Family medicine ,medicine ,education ,business - Abstract
No abstract available.
- Published
- 2023
13. Epileptologists infrequently discuss the risk of intubation with patients with epilepsy in the United States
- Author
-
Andrew J. Solomon, Robert Macauley, and David C. Spencer
- Subjects
Adult ,Advance care planning ,medicine.medical_treatment ,Context (language use) ,Status epilepticus ,03 medical and health sciences ,Epilepsy ,0302 clinical medicine ,Surveys and Questionnaires ,Intubation, Intratracheal ,Humans ,Medicine ,Intubation ,030212 general & internal medicine ,Advanced and Specialized Nursing ,Response rate (survey) ,Mechanical ventilation ,business.industry ,medicine.disease ,Directive ,United States ,nervous system diseases ,Anesthesiology and Pain Medicine ,Medical emergency ,medicine.symptom ,Advance Directives ,business ,030217 neurology & neurosurgery - Abstract
BACKGROUND The aim of this study was to assess how frequently epileptologists discuss advance directives regarding intubation and mechanical ventilation with patients with epilepsy. A secondary aim was to understand the attitudes of neurologists toward discussion and implementation of such advance directives in epilepsy care. METHODS An online study survey was developed and distributed by email invitation to 210 neurologists at academic epilepsy and neurophysiology programs in the United States in December 2018. RESULTS Seventy-seven neurologists, 95% with a clinical practice focus of epilepsy in adults, participated in the study (37% response rate). Three percent reported discussion of risk of intubation with "every" or a "majority" of patients newly diagnosed with epilepsy. Seventy-seven percent indicated a neurologist was the "most appropriate provider to have discussions concerning mechanical ventilation with patients with epilepsy." Twenty-five percent "strongly agreed" that "every patient with epilepsy should have an advance directive specifying their preferences concerning mechanical ventilation in the setting of treatment for seizures." A majority favored overriding a hypothetical patient's advance directive specifying no intubation in the context of airway compromise as a consequence of status epilepticus and its treatment. CONCLUSIONS Epileptologists infrequently discuss the risk of intubation and mechanical ventilation with patients with epilepsy. Many felt that such discussions are unnecessary with most patients, but also best led by a neurologist. Neurologists with expertise in epilepsy may favor overriding advance directives in the setting of status epilepticus. Further data is needed surrounding discussion and implementation of advance care planning in patients with epilepsy.
- Published
- 2021
- Full Text
- View/download PDF
14. Concurrent brain-responsive and vagus nerve stimulation for treatment of drug-resistant focal epilepsy
- Author
-
Mesha-Gay Brown, Stefan Sillau, Danielle McDermott, Lia D. Ernst, David C. Spencer, Dario J. Englot, Hernán F.J. González, Proleta Datta, Ioannis Karakis, Danielle Becker, John D. Rolston, Amir Arain, Vikram R. Rao, Michael Doherty, Alexandra Urban, and Cornelia Drees
- Subjects
Adult ,Behavioral Neuroscience ,Drug Resistant Epilepsy ,Treatment Outcome ,Neurology ,Vagus Nerve Stimulation ,Brain ,Humans ,Vagus Nerve ,Neurology (clinical) ,Epilepsies, Partial ,Retrospective Studies - Abstract
Clinical trials of a brain-responsive neurostimulator, RNS® System (RNS), excluded patients with a vagus nerve stimulator, VNS® System (VNS). The goal of this study was to evaluate seizure outcomes and safety of concurrent RNS and VNS stimulation in adults with drug-resistant focal-onset seizures.A retrospective multicenter chart review was performed on all patients with an active VNS and RNS who were treated for a minimum of 6 months with both systems concurrently. Frequency of disabling seizures at baseline before RNS, at 1 year after RNS placement, and at last follow-up were used to calculate the change in seizure frequency after treatment. Data on adverse events and complications related to each device were collected.Sixty-four patients from 10 epilepsy centers met inclusion criteria. All but one patient received RNS after VNS. The median follow-up time after RNS implantation was 28 months. Analysis of the entire population of patients with active VNS and RNS systems revealed a median reduction in seizure frequency at 1 year post-RNS placement of 43% with a responder rate of 49%, and at last follow-up a 64% median reduction with a 67% responder rate. No negative interactions were reported from the concurrent use of VNS and RNS. Stimulation-related side-effects were reported more frequently in association with VNS (30%) than with RNS (2%).Our findings suggest that concurrent treatment with VNS and RNS is safe and that the addition of RNS to VNS can further reduce seizure frequency.
- Published
- 2021
15. Transcranial magnetic stimulation for the treatment of epilepsy
- Author
-
Ricky Chen, David C. Spencer, Sarah J Nolan, and Jennifer Weston
- Subjects
0301 basic medicine ,medicine.medical_specialty ,Drug Resistant Epilepsy ,Population ,Placebo ,law.invention ,03 medical and health sciences ,Epilepsy ,0302 clinical medicine ,Randomized controlled trial ,Quality of life ,law ,Internal medicine ,medicine ,Humans ,Pharmacology (medical) ,education ,Adverse effect ,Randomized Controlled Trials as Topic ,education.field_of_study ,business.industry ,Electroencephalography ,medicine.disease ,Transcranial Magnetic Stimulation ,Clinical trial ,030104 developmental biology ,Physical therapy ,business ,030217 neurology & neurosurgery - Abstract
BACKGROUND: Epilepsy is a highly prevalent neurological condition characterised by repeated unprovoked seizures with various aetiologies. Although antiepileptic medications produce clinical improvement in many individuals, nearly a third of individuals have drug‐resistant epilepsy that carries significant morbidity and mortality, and even individuals who have clinical improvement from antiepileptic medications often report iatrogenic symptoms. There remains a need for non‐invasive and more effective therapies for this population. Transcranial magnetic stimulation (TMS) uses electromagnetic coils to excite or inhibit neurons, with repetitive pulses at low‐frequency producing an inhibitory effect that could conceivably reduce cortical excitability associated with epilepsy. This is an updated version of the original Cochrane Review published in 2016. OBJECTIVES: To assess the evidence for the use of TMS in individuals with drug‐resistant epilepsy compared with other available treatments in reducing seizure frequency, improving quality of life, reducing epileptiform discharges, antiepileptic medication use, and side effects. SEARCH METHODS: For the latest update, we searched the Cochrane Register of Studies (CRS Web) and MEDLINE (Ovid 1946 to 2 June 2020). CRS Web includes randomised or quasi‐randomised controlled trials from PubMed, Embase, ClinicalTrials.gov, the World Health Organization International Clinical Trials Registry Platform (WHO ICTRP), the Cochrane Central Register of Controlled Trials (CENTRAL), and the specialised registers of Cochrane Review Groups including Epilepsy. SELECTION CRITERIA: We included randomised controlled trials that were double‐blinded, single‐blinded, or unblinded, and placebo controlled, no treatment, or active controlled, which used repetitive transcranial magnetic stimulation (rTMS) without restriction of frequency, coil, duration or intensity on participants with drug‐resistant epilepsy. DATA COLLECTION AND ANALYSIS: We extracted information from each trial including methodological data; participant demographics including baseline seizure frequency, type of epileptic drugs taken; intervention details and intervention groups for comparison; potential biases; and outcomes and time points, primarily change in seizure frequency or responder rates, as well as quality of life and epileptiform discharges, adverse effects, and changes in medication use. MAIN RESULTS: The original search revealed 274 records from the databases that after selection provided seven full‐text relevant studies for inclusion. The latest search identified 179 new records from the databases that after evaluation against the inclusion and exclusion criteria provided one additional full‐text relevant study. The eight included studies (241 participants) were all randomised trials; seven of the studies were blinded. Methodological and design information in the included studies was unclear, particularly relating to randomisation and allocation concealment methods. We were not able to combine the results of the trials in analysis due to differences in the studies' designs. For the current update, two of the eight studies analysed showed a statistically significant reduction in seizure rate from baseline (72% and 78.9% reduction of seizures per week from the baseline rate, respectively), whilst the other six studies showed no statistically significant difference in seizure frequency following rTMS treatment compared with controls (low‐certainty evidence). One study assessed quality of life and found that more participants showed improvement in quality of life scores with active treatments compared to the sham treatment, but this only involved seven participants (very low‐certainty evidence). Four studies evaluated our secondary endpoint of mean number of epileptic discharges, three of which showed a statistically significant reduction in discharges after active rTMS treatment. Adverse effects were uncommon in the studies and typically involved headache, dizziness, and tinnitus; however increased seizure frequency did occur in a small number of individuals. The included trials reported no significant changes in medication use. Overall the risk of bias was either low or unclear, and the certainty of the evidence was low to very low. AUTHORS' CONCLUSIONS: Overall, we judged the certainty of evidence for the primary outcomes of this review to be low to very low. We found some evidence to suggest that rTMS is safe but some adverse events were experienced. The variability in technique and outcome reporting prevented meta‐analysis, and the evidence for efficacy of rTMS for seizure reduction is still lacking, despite reasonable evidence that it is effective at reducing epileptiform discharges.
- Published
- 2021
- Full Text
- View/download PDF
16. Safety and efficacy of midazolam nasal spray for the treatment of intermittent bouts of increased seizure activity in the epilepsy monitoring unit: A double-blind, randomized, placebo-controlled trial
- Author
-
David C. Spencer, Saurabh R. Sinha, James W. Wheless, Eun Jung Choi, Aliceson King, Tze Chiang Meng, William E Pullman, Jody M. Cleveland, Peter J. Van Ess, and David J Sequeira
- Subjects
0301 basic medicine ,Adult ,Male ,Adolescent ,medicine.medical_treatment ,Midazolam ,Population ,Placebo-controlled study ,Placebo ,03 medical and health sciences ,Epilepsy ,Young Adult ,0302 clinical medicine ,Double-Blind Method ,Seizures ,medicine ,Humans ,education ,Adverse effect ,Child ,GABA Modulators ,Administration, Intranasal ,Monitoring, Physiologic ,education.field_of_study ,business.industry ,Headache ,Nasal Sprays ,Middle Aged ,medicine.disease ,030104 developmental biology ,Treatment Outcome ,Neurology ,Tolerability ,Nasal spray ,Anesthesia ,Anticonvulsants ,Female ,Neurology (clinical) ,business ,030217 neurology & neurosurgery ,medicine.drug - Abstract
Objective Midazolam nasal spray (MDZ-NS) is indicated for acute treatment of intermittent, stereotypic episodes of frequent seizure activity (ie, seizure clusters, acute repetitive seizures) that are distinct from a patient's usual seizure pattern, in patients 12 years of age and older with epilepsy. This trial evaluated safety and efficacy of MDZ-NS in patients with epilepsy who were admitted to the epilepsy monitoring unit for seizure characterization/presurgical evaluation. Methods In this randomized, double-blind, placebo-controlled phase 3 trial (P261-301; NCT01999777), eligible patients with ≥2 seizures in the 6-hour window preceding trial medication administration for whom treatment was appropriate based on investigator's judgment were randomized (1:1) to MDZ-NS 5 mg or placebo. Efficacy outcomes were proportion of patients seizure-free for 6 hours after treatment and time to first seizure within 6 hours. Safety and tolerability outcomes included treatment-emergent adverse events (TEAEs). Results Sixty-two patients were randomized (MDZ-NS n = 31; placebo n = 31), received trial medication, and completed the trial. A higher proportion of patients on MDZ-NS than placebo were seizure-free for 6 hours following treatment (54.8% vs 38.7%); however, the 16.1% difference was not statistically significant (P = .1972). The Kaplan-Meier curve of time to first seizure showed separation of both groups in favor of MDZ-NS from ~1.5 hours post-dose and throughout the 6-hour Treatment phase. Median time to first seizure was not estimable for MDZ-NS (>50% of patients had no seizure) and 3.9 hours for placebo (P = .1388). TEAEs with MDZ-NS were generally comparable to those with placebo. There were no deaths, serious TEAEs, or discontinuations due to TEAEs. Significance Although the observed treatment difference may be clinically meaningful, statistical significance was not demonstrated. Results suggest that MDZ-NS 5 mg may provide improvement over placebo, with efficacy maintained for ≥6 hours post-dose. MDZ-NS was well tolerated in this population.
- Published
- 2020
17. High Cryptococcal Antigen Titers in Blood Are Predictive of Subclinical Cryptococcal Meningitis Among Human Immunodeficiency Virus-Infected Patients
- Author
-
Joseph N Jarvis, Tanvier Omar, Adeboye Adelekan, Nelesh P. Govender, Erika Britz, Tom Chiller, Ivy Rukasha, David C. Spencer, Jeremy Nel, Sello Mashamaite, Charlotte Sriruttan, Thomas S. Harrison, and Rachel M Wake
- Subjects
Adult ,Male ,0301 basic medicine ,Microbiology (medical) ,medicine.medical_specialty ,Antifungal Agents ,Antigens, Fungal ,030106 microbiology ,Cryptococcus ,HIV Infections ,Meningitis, Cryptococcal ,Asymptomatic ,South Africa ,03 medical and health sciences ,0302 clinical medicine ,Predictive Value of Tests ,Antiretroviral Therapy, Highly Active ,Internal medicine ,Prevalence ,Humans ,Mass Screening ,Medicine ,Prospective Studies ,030212 general & internal medicine ,Articles and Commentaries ,Asymptomatic Infections ,Mass screening ,Retrospective Studies ,Subclinical infection ,biology ,business.industry ,Mortality rate ,Middle Aged ,biology.organism_classification ,medicine.disease ,CD4 Lymphocyte Count ,Infectious Diseases ,Predictive value of tests ,Immunology ,Female ,medicine.symptom ,business ,Meningitis ,Fluconazole ,medicine.drug - Abstract
Background\ud High mortality rates among asymptomatic cryptococcal antigen (CrAg)–positive patients identified through CrAg screening, despite preemptive fluconazole treatment, may be due to undiagnosed cryptococcal meningitis.\ud \ud Methods\ud Symptoms were reviewed in CrAg-positive patients identified by screening 19233 individuals with human immunodeficiency virus infection and CD4 cell counts 160 (sensitivity, 88.2%; specificity, 82.1%); the odds ratio for concurrent cryptococcal meningitis was 34.5 (95% confidence interval, 8.3–143.1; P < .001).\ud \ud Conclusions\ud About a third of asymptomatic CrAg-positive patients have concurrent cryptococcal meningitis. More effective clinical assessment strategies and antifungal regimens are required for CrAg-positive patients, including investigation for cryptococcal meningitis irrespective of symptoms. Where it is not possible to perform lumbar punctures in all CrAg-positive patients, blood CrAg titers should be used to target those most at risk of cryptococcal meningitis.
- Published
- 2017
- Full Text
- View/download PDF
18. Brain-responsive neurostimulation in patients with medically intractable seizures arising from eloquent and other neocortical areas
- Author
-
Raj D. Sheth, David G. Vossler, Gregory A. Worrell, Richard S. Zimmerman, Ritu Kapur, Barbara C. Jobst, Gregory L. Barkley, Eli M. Mizrahi, Robert B. Duckrow, Michael C. Smith, Anthony M. Murro, Andrew J. Cole, Robert E. Wharen, Ian Miller, Robert E. Gross, Martha J. Morrell, Jane G. Boggs, Jonathan C. Edwards, Michel J. Berg, Eric B. Geller, Kimford J. Meador, Daniel Yoshor, Tara L. Skarpaas, Alica M. Goldman, Paul Rutecki, David King-Stephens, Vicenta Salanova, A. James Fessler, William O. Tatum, Shraddha Srinivasan, Katherine H. Noe, David C. Spencer, Ryder P. Gwinn, Christianne N. Heck, Nathan B. Fountain, Sydney S. Cash, Stephan Eisenschenk, Gregory K. Bergey, Douglas Labar, Carl W. Bazil, Dileep Nair, Robert R. Goodman, Christopher Skidmore, Yong D. Park, Michael Duchowny, Lawrence J. Hirsch, W. R. Marsh, Piotr W. Olejniczak, Paul C. Van Ness, and Aamr A. Herekar
- Subjects
Adult ,Male ,Drug Resistant Epilepsy ,Deep brain stimulation ,Adolescent ,Deep Brain Stimulation ,medicine.medical_treatment ,Responsive neurostimulation device ,Electric Stimulation Therapy ,Neocortex ,Epilepsy, Partial, Motor ,Young Adult ,03 medical and health sciences ,Epilepsy ,Epilepsy, Complex Partial ,0302 clinical medicine ,medicine ,Humans ,Epilepsy surgery ,030212 general & internal medicine ,Neurostimulation ,Cerebral Cortex ,Brain Mapping ,medicine.diagnostic_test ,Electroencephalography ,Magnetic resonance imaging ,Middle Aged ,medicine.disease ,Electrodes, Implanted ,Neurology ,Brain stimulation ,Anesthesia ,Feasibility Studies ,Female ,Epilepsies, Partial ,Epilepsy, Tonic-Clonic ,Neurology (clinical) ,Psychology ,030217 neurology & neurosurgery ,Vagus nerve stimulation ,Follow-Up Studies - Abstract
SummaryObjective Evaluate the seizure-reduction response and safety of brain-responsive stimulation in adults with medically intractable partial-onset seizures of neocortical origin. Methods Patients with partial seizures of neocortical origin were identified from prospective clinical trials of a brain-responsive neurostimulator (RNS System, NeuroPace). The seizure reduction over years 2–6 postimplantation was calculated by assessing the seizure frequency compared to a preimplantation baseline. Safety was assessed based on reported adverse events. Additional analyses considered safety and seizure reduction according to lobe and functional area (e.g., eloquent cortex) of seizure onset. Results There were 126 patients with seizures of neocortical onset. The average follow-up was 6.1 implant years. The median percent seizure reduction was 70% in patients with frontal and parietal seizure onsets, 58% in those with temporal neocortical onsets, and 51% in those with multilobar onsets (last observation carried forward [LOCF] analysis). Twenty-six percent of patients experienced at least one seizure-free period of 6 months or longer and 14% experienced at least one seizure-free period of 1 year or longer. Patients with lesions on magnetic resonance imaging (MRI; 77% reduction, LOCF) and those with normal MRI findings (45% reduction, LOCF) benefitted, although the treatment response was more robust in patients with an MRI lesion (p = 0.02, generalized estimating equation [GEE]). There were no differences in the seizure reduction in patients with and without prior epilepsy surgery or vagus nerve stimulation. Stimulation parameters used for treatment did not cause acute or chronic neurologic deficits, even in eloquent cortical areas. The rates of infection (0.017 per patient implant year) and perioperative hemorrhage (0.8%) were not greater than with other neurostimulation devices. Significance Brain-responsive stimulation represents a safe and effective treatment option for patients with medically intractable epilepsy, including adults with seizures of neocortical onset, and those with onsets from eloquent cortex.
- Published
- 2017
- Full Text
- View/download PDF
19. Electrocorticographic events from long-term ambulatory brain recordings can potentially supplement seizure diaries
- Author
-
Beata Jarosiewicz, Martha J. Morrell, Mark Quigg, Tara L. Skarpaas, David C. Spencer, and Nathan B. Fountain
- Subjects
0301 basic medicine ,Adult ,Male ,medicine.medical_specialty ,Drug Resistant Epilepsy ,medicine.medical_treatment ,Concordance ,Deep Brain Stimulation ,law.invention ,03 medical and health sciences ,Epilepsy ,0302 clinical medicine ,Randomized controlled trial ,law ,Seizures ,Internal medicine ,otorhinolaryngologic diseases ,medicine ,Humans ,Generalized estimating equation ,Neurostimulation ,Electrocorticography ,Retrospective Studies ,medicine.diagnostic_test ,business.industry ,Electroencephalography ,Middle Aged ,medicine.disease ,030104 developmental biology ,Implantable Neurostimulators ,Treatment Outcome ,Neurology ,Ambulatory ,Adjunctive treatment ,Female ,Neurology (clinical) ,business ,030217 neurology & neurosurgery - Abstract
Purpose To determine the feasibility of using epileptiform events detected by continuous electrocorticographic monitoring via a brain-responsive neurostimulation system to supplement patient-maintained seizure diaries. Methods Data were retrospectively analyzed from a randomized controlled trial of brain-responsive neurostimulation (RNS® System) for adjunctive treatment of medically intractable focal onset seizures in 191 subjects. The long-term (≥3 months) correspondence between daily counts of diary-reported seizures and device-recorded “long epileptiform events” (LEs), a proxy for electrographic seizures (ESs), was assessed using cross-correlation and logistic generalized estimating equation models. Results Diary-reported seizures and LEs significantly co-varied across days in 124 patients whose detection settings were held constant, with a significantly higher correlation in 54 patients (44 %) whose LEs were usually ESs (high concordance patients). There were more days in which LEs were detected than days in which patients reported a seizure (positive predictive value (PPV): 34 %). On days when there were no LEs, there were typically no diary-reported seizures (negative predictive value (NPV): 90 %). In patients with a high concordance between LEs and ESs, the PPV and NPV were both slightly higher, 43 % (35–52 %) and 93 % (95 % CI: 86–97 %) respectively. Conclusion Although LEs can substantially outnumber diary reported seizures, the high across-day correlation and strong NPV between LEs and diary seizures suggests that LEs recorded by the RNS® System could potentially supplement seizure diaries by providing an objective biomarker for relative seizure burden.
- Published
- 2019
20. Practice guideline summary: Use of fMRI in the presurgical evaluation of patients with epilepsy
- Author
-
William H. Theodore, Jeffrey R. Binder, William D. Gaillard, David Gloss, Jeffrey G. Ojemann, Jerzy P. Szaflarski, Sara J. Swanson, Jacqueline A. French, David C. Spencer, Scott K. Holland, and Alexandra J. Golby
- Subjects
Research Report ,medicine.medical_specialty ,Neurology ,Spatial memory ,Lateralization of brain function ,030218 nuclear medicine & medical imaging ,Temporal lobe ,Special Article ,03 medical and health sciences ,Epilepsy ,0302 clinical medicine ,Physical medicine and rehabilitation ,Humans ,Medicine ,Epilepsy surgery ,business.industry ,Academies and Institutes ,Guideline ,medicine.disease ,Magnetic Resonance Imaging ,United States ,Neurology (clinical) ,Verbal memory ,business ,030217 neurology & neurosurgery - Abstract
Objective:To assess the diagnostic accuracy and prognostic value of functional MRI (fMRI) in determining lateralization and predicting postsurgical language and memory outcomes.Methods:An 11-member panel evaluated and rated available evidence according to the 2004 American Academy of Neurology process. At least 2 panelists reviewed the full text of 172 articles and selected 37 for data extraction. Case reports, reports with Results and recommendations:The use of fMRI may be considered an option for lateralizing language functions in place of intracarotid amobarbital procedure (IAP) in patients with medial temporal lobe epilepsy (MTLE; Level C), temporal epilepsy in general (Level C), or extratemporal epilepsy (Level C). For patients with temporal neocortical epilepsy or temporal tumors, the evidence is insufficient (Level U). fMRI may be considered to predict postsurgical language deficits after anterior temporal lobe resection (Level C). The use of fMRI may be considered for lateralizing memory functions in place of IAP in patients with MTLE (Level C) but is of unclear utility in other epilepsy types (Level U). fMRI of verbal memory or language encoding should be considered for predicting verbal memory outcome (Level B). fMRI using nonverbal memory encoding may be considered for predicting visuospatial memory outcomes (Level C). Presurgical fMRI could be an adequate alternative to IAP memory testing for predicting verbal memory outcome (Level C). Clinicians should carefully advise patients of the risks and benefits of fMRI vs IAP during discussions concerning choice of specific modality in each case.
- Published
- 2017
- Full Text
- View/download PDF
21. Does Disseminated Nontuberculous Mycobacterial Disease Cause False-Positive Determine TB-LAM Lateral Flow Assay Results? A Retrospective Review
- Author
-
Jeremy Nel, Christopher K Lippincott, David C. Spencer, Prudence Ive, Ian Sanne, and Rebecca Berhanu
- Subjects
0301 basic medicine ,Microbiology (medical) ,medicine.medical_specialty ,Tuberculosis ,030106 microbiology ,Disease ,03 medical and health sciences ,0302 clinical medicine ,Tuberculosis diagnosis ,immune system diseases ,hemic and lymphatic diseases ,Internal medicine ,medicine ,030212 general & internal medicine ,Lipoarabinomannan ,biology ,business.industry ,Retrospective cohort study ,Mycobacterial disease ,bacterial infections and mycoses ,biology.organism_classification ,medicine.disease ,Infectious Diseases ,Immunology ,Coinfection ,lipids (amino acids, peptides, and proteins) ,Nontuberculous mycobacteria ,business - Abstract
We retrospectively reviewed the Determine TB-LAM lateral flow assay (LF-LAM) results among human immunodeficiency virus-infected patients with disseminated nontuberculous mycobacterial (NTM) disease. LF-LAM was positive in 19 of 21 patients without evidence of tuberculosis (TB) coinfection. Although TB-NTM coinfection may have been underdiagnosed, our results suggest that disseminated NTM disease may cause false-positive LF-LAM results.
- Published
- 2017
- Full Text
- View/download PDF
22. Celebrating 20 Years
- Author
-
Lara Jehi, Michael Wong, Steve C. Danzer, and David C. Spencer
- Subjects
Editorial ,business.industry ,Medicine ,Neurology (clinical) ,Ancient history ,business - Published
- 2020
23. Epilepsy-Specific Citation Classics Revisited
- Author
-
Gary L. Westbrook, David C. Spencer, and Marissa Kellogg
- Subjects
0301 basic medicine ,Current Review In Clinical Science ,business.industry ,MEDLINE ,Library science ,Citation classics ,medicine.disease ,03 medical and health sciences ,Epilepsy ,030104 developmental biology ,0302 clinical medicine ,Medicine ,Neurology (clinical) ,business ,030217 neurology & neurosurgery - Published
- 2018
24. Lateralization of mesial temporal lobe epilepsy with chronic ambulatory electrocorticography
- Author
-
Alica M. Goldman, Robert E. Wharen, Gregory A. Worrell, Barbara C. Jobst, Paul C. Van Ness, Toni Sadler, Robert E. Gross, Dileep Nair, David C. Spencer, Gregory L. Barkley, Yong D. Park, Nathan B. Fountain, Michel J. Berg, Andrew J. Cole, Felice T. Sun, Lawrence J. Hirsch, Eric B. Geller, Donald C. Shields, Martha J. Morrell, Michael R. Sperling, Marvin A. Rossi, Kenneth D. Laxer, Jonathan C. Edwards, Stephan Eisenschenk, Ryder P. Gwinn, Christianne N. Heck, Gregory K. Bergey, Paul Rutecki, Emily A. Mirro, David King-Stephens, Ian Miller, Vicenta Salanova, and Peter B. Weber
- Subjects
EEG monitoring ,Adult ,Male ,medicine.medical_specialty ,Adolescent ,Responsive neurostimulation device ,Electroencephalography ,Audiology ,Hippocampus ,Functional Laterality ,Lateralization of brain function ,Temporal lobe ,Young Adult ,Epilepsy ,medicine ,Humans ,Longitudinal Studies ,Ambulatory EEG ,Electrocorticography ,Retrospective Studies ,Full-Length Original Research ,Intracranial EEG ,medicine.diagnostic_test ,Middle Aged ,medicine.disease ,Brain Waves ,Magnetic Resonance Imaging ,Electrodes, Implanted ,medicine.anatomical_structure ,Epilepsy, Temporal Lobe ,Neurology ,Localization ,Scalp ,Anesthesia ,Ambulatory ,Electrocardiography, Ambulatory ,Responsive stimulation ,Female ,Neurology (clinical) ,Psychology ,psychological phenomena and processes - Abstract
Objective Patients with suspected mesial temporal lobe (MTL) epilepsy typically undergo inpatient video–electroencephalography (EEG) monitoring with scalp and/or intracranial electrodes for 1 to 2 weeks to localize and lateralize the seizure focus or foci. Chronic ambulatory electrocorticography (ECoG) in patients with MTL epilepsy may provide additional information about seizure lateralization. This analysis describes data obtained from chronic ambulatory ECoG in patients with suspected bilateral MTL epilepsy in order to assess the time required to determine the seizure lateralization and whether this information could influence treatment decisions. Methods Ambulatory ECoG was reviewed in patients with suspected bilateral MTL epilepsy who were among a larger cohort with intractable epilepsy participating in a randomized controlled trial of responsive neurostimulation. Subjects were implanted with bilateral MTL leads and a cranially implanted neurostimulator programmed to detect abnormal interictal and ictal ECoG activity. ECoG data stored by the neurostimulator were reviewed to determine the lateralization of electrographic seizures and the interval of time until independent bilateral MTL electrographic seizures were recorded. Results Eighty-two subjects were implanted with bilateral MTL leads and followed for 4.7 years on average (median 4.9 years). Independent bilateral MTL electrographic seizures were recorded in 84%. The average time to record bilateral electrographic seizures in the ambulatory setting was 41.6 days (median 13 days, range 0–376 days). Sixteen percent had only unilateral electrographic seizures after an average of 4.6 years of recording. Significance About one third of the subjects implanted with bilateral MTL electrodes required >1 month of chronic ambulatory ECoG before the first contralateral MTL electrographic seizure was recorded. Some patients with suspected bilateral MTL seizures had only unilateral electrographic seizures. Chronic ambulatory ECoG in patients with suspected bilateral MTL seizures provides data in a naturalistic setting, may complement data from inpatient video-EEG monitoring, and can contribute to treatment decisions.
- Published
- 2015
- Full Text
- View/download PDF
25. Interrater reliability in interpretation of electrocorticographic seizure detections of the responsive neurostimulator
- Author
-
Victoria S. S. Wong, Barbara C. Jobst, Mark Quigg, David C. Spencer, Emily A. Mirro, Sarah Brown, Nathan B. Fountain, and Felice T. Sun
- Subjects
Adult ,Male ,medicine.medical_specialty ,Responsive neurostimulation device ,Audiology ,Electroencephalography ,law.invention ,Randomized controlled trial ,law ,medicine ,Humans ,EEG ,Electrocorticography ,neoplasms ,Retrospective Studies ,partial seizures ,medicine.diagnostic_test ,Full‐Length Original Research ,Brain electrical stimulation ,Kappa score ,Reproducibility of Results ,Focal epilepsy ,medicine.disease ,Seizure detection ,Brain Waves ,Inter-rater reliability ,Implantable Neurostimulators ,Treatment Outcome ,Neurology ,Anesthesia ,Ambulatory ,Female ,Neurology (clinical) ,Epilepsies, Partial ,Psychology - Abstract
Summary Objective Electrocorticographic (ECoG) recordings from patients with medically intractable partial-onset seizures treated with a responsive neurostimulator system (the RNS System) that detects and stores physician-specified ECoG events provide a new data resource. Interpretation of these recordings has not yet been validated. The purpose was to evaluate the interrater interpretation of chronic ambulatory ECoG recordings obtained by the RNS System. Methods Five pairs of five experts independently classified 7,221 ECoG recordings obtained from 128 patients with medically intractable partial seizures who participated in a randomized controlled trial of the safety and efficacy of the RNS System. ECoG detections—“long episodes” or “saturations”—were classified as “seizures” or “not seizures” based on a reference definition. Interrater agreement rates and kappa score reliabilities were calculated between rater pairs from the ECoG sample as a whole and within individual patients who had more than the median number of individual ECoG recordings. Results The overall interrater agreement was 79%, with a reliability κ = 0.57 (moderate agreement). Agreement between pairs of reviewers ranged from 0.69 to 0.85. Agreement rates were 94% or better for 50% of patients. Only 25% of patients had ECoG recordings agreement rates worse than 75%. ECoGs with mixed interpretations (one reviewer “seizure”/the other—“not seizure”) consisted of periods of low amplitude activity that evolved in amplitude or periodic discharges near 2 Hz. Significance Although reliability as a whole was moderate, for the majority of patients, detections yielded highly reliably interpreted events of either electrographic seizures or nonictal epileptiform activity.
- Published
- 2015
26. Long-term treatment with responsive brain stimulation in adults with refractory partial seizures
- Author
-
Robert B. Duckrow, Robert E. Gross, Donald C. Shields, Andrew Massey, Douglas Labar, Jonathan C. Edwards, David King-Stephens, Paul C. Van Ness, Michel J. Berg, Paul Rutecki, Shraddha Srinivasan, Piotr W. Olejniczak, Ryder P. Gwinn, Martha J. Morrell, Cairn G. Seale, Andrew J. Cole, Sydney S. Cash, Lawrence J. Hirsch, Barbara C. Jobst, Michael C. Smith, Robert E. Wharen, Stephan Eisenschenk, Gregory K. Bergey, Tracy A. Courtney, David C. Spencer, Cormac A. O'Donovan, Anthony M. Murro, Alica M. Goldman, Katherine H. Noe, Michael Duchowny, Nathan B. Fountain, Gregory A. Worrell, Eric B. Geller, Gregory L. Barkley, Eli M. Mizrahi, Dileep Nair, Christopher Skidmore, Felice T. Sun, Vicenta Salanova, and Christianne N. Heck
- Subjects
Adult ,Male ,Time Factors ,Deep brain stimulation ,Adolescent ,Deep Brain Stimulation ,medicine.medical_treatment ,Responsive neurostimulation device ,law.invention ,Young Adult ,03 medical and health sciences ,Epilepsy ,0302 clinical medicine ,Double-Blind Method ,Randomized controlled trial ,Refractory ,law ,medicine ,Humans ,Prospective Studies ,Prospective cohort study ,Neurostimulation ,Aged ,030304 developmental biology ,0303 health sciences ,business.industry ,Middle Aged ,medicine.disease ,3. Good health ,Treatment Outcome ,Brain stimulation ,Anesthesia ,Female ,Epilepsies, Partial ,Neurology (clinical) ,business ,030217 neurology & neurosurgery ,Follow-Up Studies - Abstract
The long-term efficacy and safety of responsive direct neurostimulation was assessed in adults with medically refractory partial onset seizures.All participants were treated with a cranially implanted responsive neurostimulator that delivers stimulation to 1 or 2 seizure foci via chronically implanted electrodes when specific electrocorticographic patterns are detected (RNS System). Participants had completed a 2-year primarily open-label safety study (n = 65) or a 2-year randomized blinded controlled safety and efficacy study (n = 191); 230 participants transitioned into an ongoing 7-year study to assess safety and efficacy.The average participant was 34 (±11.4) years old with epilepsy for 19.6 (±11.4) years. The median preimplant frequency of disabling partial or generalized tonic-clonic seizures was 10.2 seizures a month. The median percent seizure reduction in the randomized blinded controlled trial was 44% at 1 year and 53% at 2 years (p0.0001, generalized estimating equation) and ranged from 48% to 66% over postimplant years 3 through 6 in the long-term study. Improvements in quality of life were maintained (p0.05). The most common serious device-related adverse events over the mean 5.4 years of follow-up were implant site infection (9.0%) involving soft tissue and neurostimulator explantation (4.7%).The RNS System is the first direct brain responsive neurostimulator. Acute and sustained efficacy and safety were demonstrated in adults with medically refractory partial onset seizures arising from 1 or 2 foci over a mean follow-up of 5.4 years. This experience supports the RNS System as a treatment option for refractory partial seizures.This study provides Class IV evidence that for adults with medically refractory partial onset seizures, responsive direct cortical stimulation reduces seizures and improves quality of life over a mean follow-up of 5.4 years.
- Published
- 2015
- Full Text
- View/download PDF
27. Responsive Neurostimulation and Cognition
- Author
-
David C. Spencer
- Subjects
business.industry ,05 social sciences ,Cognition ,03 medical and health sciences ,0302 clinical medicine ,Text mining ,Medicine ,0501 psychology and cognitive sciences ,050102 behavioral science & comparative psychology ,Neurology (clinical) ,business ,Responsive neurostimulation ,Neuroscience ,Current Literature In Clinical Science ,030217 neurology & neurosurgery - Published
- 2016
- Full Text
- View/download PDF
28. Brain-responsive neurostimulation in patients with medically intractable mesial temporal lobe epilepsy
- Author
-
Douglas Labar, Dileep Nair, Christopher Skidmore, Felice T. Sun, David C. Spencer, Martha J. Morrell, Daniel Yoshor, Eric B. Geller, Gregory L. Barkley, Tara L. Skarpaas, Eli M. Mizrahi, Nathan B. Fountain, David King-Stephens, Sydney S. Cash, James Fessler, Michael J. Berg, Gregory A. Worrell, David G. Vossler, Barbara C. Jobst, Ryder P. Gwinn, William O. Tatum, Christianne N. Heck, Andrew J. Cole, Raj D. Sheth, Shraddha Srinivasan, Carl W. Bazil, Stephan Eisenschenk, Aamar Herekar, Richard S. Zimmerman, Gregory K. Bergey, Michael C. Smith, James W. Leiphart, Robert E. Wharen, Robert E. Gross, Robert B. Duckrow, Jonathan C. Edwards, Paul C. Van Ness, Donald C. Shields, Paul Rutecki, W. Richard Marsh, Vicenta Salanova, Kimford J. Meador, Lawrence J. Hirsch, Anthony M. Murro, Alicia M. Goldman, Robert R. Goodman, Kathy Cicora, Yong D. Park, and Katherine H. Noe
- Subjects
0301 basic medicine ,Adult ,Male ,Drug Resistant Epilepsy ,Deep brain stimulation ,Adolescent ,medicine.medical_treatment ,Responsive neurostimulation device ,Deep Brain Stimulation ,Electric Stimulation Therapy ,Electroencephalography ,Temporal lobe ,03 medical and health sciences ,Epilepsy ,Young Adult ,0302 clinical medicine ,medicine ,Humans ,Dominance, Cerebral ,Neurostimulation ,medicine.diagnostic_test ,business.industry ,Brain ,Middle Aged ,medicine.disease ,Long-Term Care ,Electrodes, Implanted ,030104 developmental biology ,Neurology ,Epilepsy, Temporal Lobe ,Anesthesia ,Feasibility Studies ,Female ,Neurology (clinical) ,Epilepsies, Partial ,business ,030217 neurology & neurosurgery ,Vagus nerve stimulation ,Follow-Up Studies - Abstract
SummaryObjective Evaluate the seizure-reduction response and safety of mesial temporal lobe (MTL) brain-responsive stimulation in adults with medically intractable partial-onset seizures of mesial temporal lobe origin. Methods Subjects with mesial temporal lobe epilepsy (MTLE) were identified from prospective clinical trials of a brain-responsive neurostimulator (RNS System, NeuroPace). The seizure reduction over years 2–6 postimplantation was calculated by assessing the seizure frequency compared to a preimplantation baseline. Safety was assessed based on reported adverse events. Results There were 111 subjects with MTLE; 72% of subjects had bilateral MTL onsets and 28% had unilateral onsets. Subjects had one to four leads placed; only two leads could be connected to the device. Seventy-six subjects had depth leads only, 29 had both depth and strip leads, and 6 had only strip leads. The mean follow-up was 6.1 ± (standard deviation) 2.2 years. The median percent seizure reduction was 70% (last observation carried forward). Twenty-nine percent of subjects experienced at least one seizure-free period of 6 months or longer, and 15% experienced at least one seizure-free period of 1 year or longer. There was no difference in seizure reduction in subjects with and without mesial temporal sclerosis (MTS), bilateral MTL onsets, prior resection, prior intracranial monitoring, and prior vagus nerve stimulation. In addition, seizure reduction was not dependent on the location of depth leads relative to the hippocampus. The most frequent serious device-related adverse event was soft tissue implant-site infection (overall rate, including events categorized as device-related, uncertain, or not device-related: 0.03 per implant year, which is not greater than with other neurostimulation devices). Significance Brain-responsive stimulation represents a safe and effective treatment option for patients with medically intractable epilepsy, including patients with unilateral or bilateral MTLE who are not candidates for temporal lobectomy or who have failed a prior MTL resection.
- Published
- 2017
29. Drug-Resistant Epilepsy: Is it Really Sometimes RRMS (Relapsing-Remitting Multiple Seizures)?
- Author
-
David C. Spencer
- Subjects
0301 basic medicine ,medicine.medical_specialty ,business.industry ,MEDLINE ,Current Literature in Clinical Science ,Drug Resistant Epilepsy ,03 medical and health sciences ,030104 developmental biology ,0302 clinical medicine ,Relapsing remitting ,Internal medicine ,Medicine ,Neurology (clinical) ,business ,030217 neurology & neurosurgery - Published
- 2017
30. Levetiracetam in Men With Epilepsy: Testosterone Is Left Alone But Sperm Count Is Paramount
- Author
-
David C. Spencer
- Subjects
Adult ,Male ,medicine.medical_specialty ,Levetiracetam ,Adolescent ,Statistics as Topic ,Current Literature in Clinical Science ,03 medical and health sciences ,Epilepsy ,Young Adult ,0302 clinical medicine ,Text mining ,Internal medicine ,Testis ,medicine ,Humans ,Gonadal Steroid Hormones ,030219 obstetrics & reproductive medicine ,Sperm Count ,business.industry ,Testosterone (patch) ,Ultrasonography, Doppler ,medicine.disease ,Sperm ,Piracetam ,Endocrinology ,Anticonvulsants ,Neurology (clinical) ,business ,030217 neurology & neurosurgery ,medicine.drug - Abstract
Epilepsy has an impact on the reproductive system. Males with epilepsy have lower fertility rates, hypo-sexuality and reduced potency compared with the general population. Anti-epileptic drugs and epilepsy itself are thought to be responsible for this reduced fertility. LEV is a second-generation anti-epileptic agent with low incidences of both adverse effects and drug-drug interactions. In this study, we have investigated the effects of LEV treatment on sex hormones and sperm parameters in newly diagnosed epilepsy patients.We recruited 26 males with newly diagnosed epilepsy and introduced LEV monotherapy. Patients were divided into two groups depending on whether they had partial or generalized seizures. We acquired the results of pre- and post-treatment sperm analyses and serum sex hormone levels. We also recorded the maximum dose, daily dose and treatment duration for each individual. Pre- and post-treatment comparisons and correlations between both sperm and sex hormone parameters and both treatment duration and dose were determined.Pre- and post-treatment sex hormone levels were not significantly different. The total sperm count, percentage of normal morphology and functional sperm count tested after treatment were significantly lower in both groups compared with pre-treatment values (p0.05). There was a moderate correlation between daily dose and reduction in functional sperm count (r: 0.41, p: 0.034).Our findings confirm that LEV treatment of newly diagnosed epilepsy patients decreases sperm parameters without altering sex hormone levels. Our results may guide the choice of anti-epileptic drug treatment among men with epilepsy.
- Published
- 2017
31. Circadian and ultradian patterns of epileptiform discharges differ by seizure-onset location during long-term ambulatory intracranial monitoring
- Author
-
Mark Quigg, Felice T. Sun, Victoria S. S. Wong, David C. Spencer, Sarah Brown, Nathan B. Fountain, Barbara C. Jobst, and Emily A. Mirro
- Subjects
0301 basic medicine ,Adult ,Male ,medicine.medical_specialty ,Adolescent ,Responsive neurostimulation device ,Period (gene) ,Monitoring, Ambulatory ,Electroencephalography ,Audiology ,03 medical and health sciences ,Epilepsy ,Young Adult ,0302 clinical medicine ,Rhythm ,Seizures ,medicine ,Humans ,Circadian rhythm ,Longitudinal Studies ,Ultradian rhythm ,Aged ,Retrospective Studies ,Cerebral Cortex ,medicine.diagnostic_test ,Middle Aged ,medicine.disease ,Brain Waves ,Circadian Rhythm ,030104 developmental biology ,Neurology ,Ambulatory ,Anticonvulsants ,Female ,Neurology (clinical) ,Psychology ,Neuroscience ,030217 neurology & neurosurgery - Abstract
SummaryObjective Previous studies reporting circadian patterns of epileptiform activity and seizures are limited by (1) short-term recording in an epilepsy monitoring unit (EMU) with altered antiepileptic drugs (AEDs) and sleep, or (2) subjective seizure diary reports. We studied circadian patterns using long-term ambulatory intracranial recordings captured by the NeuroPace RNS System. Methods Retrospective study of RNS System trial participants with stable detection parameters over a continuous 84-day period. We analyzed all detections and long device–detected epileptiform events (long episodes) and defined a subset of subjects in whom long episodes represented electrographic seizures (LE-SZ). Spectrum resampling determined the dominant frequency periodicity and cosinor analysis identified significant circadian peaks in detected activity. Chi-square analysis was used to compare subjects grouped by region of seizure onset. Results In the 134 subjects, detections showed a strongly circadian and uniform pattern irrespective of region of onset that peaked during normal sleep hours. In contrast, long episodes and LE-SZ patterns varied by region. Neocortical regions had a monophasic, nocturnally dominant rhythm, whereas limbic regions showed a more complex pattern and diurnal peak. Rhythms in some individual limbic subjects were best fit by a dual oscillator (circadian + ultradian) model. Significance Epileptiform activity has a strong 24 h periodicity with peak nocturnal occurrence. Limbic and neocortical epilepsy show divergent circadian influences. These findings confirm that circadian patterns of epileptiform activity vary by seizure-onset zone, with implications for treatment and safety, including SUDEP.
- Published
- 2016
32. Auras Are Frequent in Patients with Generalized Epilepsy
- Author
-
David C. Spencer
- Subjects
Information retrieval ,Text mining ,business.industry ,Medicine ,In patient ,Neurology (clinical) ,Generalized epilepsy ,business ,medicine.disease - Published
- 2015
- Full Text
- View/download PDF
33. MRI (Minimum Recommended Imaging) in Epilepsy
- Author
-
David C. Spencer
- Subjects
medicine.medical_specialty ,Epilepsy ,Text mining ,business.industry ,Medicine ,Medical physics ,Neurology (clinical) ,business ,medicine.disease - Published
- 2014
- Full Text
- View/download PDF
34. Long-term risk of stroke in children treated with growth hormone for short stature: Looking at the big picture
- Author
-
David C. Spencer
- Subjects
Adult ,Pituitary gland ,medicine.medical_specialty ,Growth hormone ,Short stature ,Many body ,stomatognathic system ,Risk Factors ,Internal medicine ,medicine ,Humans ,Registries ,Child ,Stroke ,Growth Disorders ,Human Growth Hormone ,business.industry ,Thyroid ,medicine.disease ,Body Height ,Long term risk ,medicine.anatomical_structure ,Endocrinology ,Neurology (clinical) ,medicine.symptom ,business - Abstract
Growth hormone (GH) is one of several substances produced in a gland near the base of the brain called the pituitary gland. The pituitary gland is sometimes called the “master gland” because the substances that it produces have effects on many body systems. For example, it sends signals to the thyroid, ovaries, and adrenal glands to regulate their output. It also regulates growth by producing GH.
- Published
- 2014
- Full Text
- View/download PDF
35. Hope for New Treatments for Acute Repetitive Seizures
- Author
-
David C. Spencer
- Subjects
medicine.medical_specialty ,business.industry ,medicine ,MEDLINE ,Neurology (clinical) ,Intensive care medicine ,business - Published
- 2014
- Full Text
- View/download PDF
36. Measuring the Value of Epilepsy Nurses
- Author
-
David C. Spencer and Mimi Callanan
- Subjects
medicine.medical_specialty ,business.industry ,030204 cardiovascular system & hematology ,medicine.disease ,03 medical and health sciences ,Epilepsy ,0302 clinical medicine ,Medicine ,Neurology (clinical) ,business ,Psychiatry ,Value (mathematics) ,030217 neurology & neurosurgery ,Current Literature In Clinical Science - Published
- 2016
37. Inspecting Resecting: Examining 20-Year Trends in Epilepsy Surgery
- Author
-
David C. Spencer
- Subjects
0301 basic medicine ,medicine.medical_specialty ,business.industry ,Current Literature in Clinical Science ,Surgery ,03 medical and health sciences ,030104 developmental biology ,0302 clinical medicine ,Text mining ,Medicine ,Epilepsy surgery ,Neurology (clinical) ,business ,030217 neurology & neurosurgery - Published
- 2016
38. Guidelines You Can Sink Your Teeth Into
- Author
-
David C. Spencer
- Subjects
geography ,Information retrieval ,geography.geographical_feature_category ,Text mining ,business.industry ,Medicine ,Neurology (clinical) ,It's Current ,business ,Sink (geography) - Published
- 2015
39. Seizures and Epileptiform Activity in Early Alzheimer Disease: How Hard Should We be Looking?
- Author
-
David C. Spencer
- Subjects
business.industry ,medicine ,Neurology (clinical) ,Alzheimer's disease ,medicine.disease ,business ,Neuroscience - Published
- 2014
- Full Text
- View/download PDF
40. A NORSE with No Name
- Author
-
David C. Spencer
- Subjects
0301 basic medicine ,03 medical and health sciences ,Norse mythology ,030104 developmental biology ,0302 clinical medicine ,business.industry ,Medicine ,Current Literature in Clinical Science ,Neurology (clinical) ,business ,030217 neurology & neurosurgery ,Classics - Published
- 2016
- Full Text
- View/download PDF
41. PRES-ing for Answers about Long-Term Seizure Risk in Patients with Posterior Reversible Encephalopathy Syndrome
- Author
-
David C. Spencer
- Subjects
Pediatrics ,medicine.medical_specialty ,Text mining ,business.industry ,medicine ,MEDLINE ,Posterior reversible encephalopathy syndrome ,In patient ,Neurology (clinical) ,medicine.disease ,business ,Bioinformatics ,Term (time) - Published
- 2015
- Full Text
- View/download PDF
42. Periodic Assessment of the Use of Continuous EEG Monitoring
- Author
-
David C. Spencer
- Subjects
Information retrieval ,Text mining ,business.industry ,Computer science ,Neurology (clinical) ,Data mining ,business ,computer.software_genre ,computer ,Eeg monitoring - Published
- 2015
- Full Text
- View/download PDF
43. Phased implementation of screening for cryptococcal disease in South Africa
- Author
-
Zukiswa Pinini, Verushka Chetty, Monika Roy, Samuel Oladoyinbo, Wendy S. Stevens, Yogan Pillay, W D Francois Venter, Waasila Jassat, David Cameron, Graeme Meintjes, Tom Chiller, Thapelo Maotoe, David C. Spencer, Thobile Mbengashe, and Nelesh P. Govender
- Subjects
medicine.medical_specialty ,business.industry ,Incidence (epidemiology) ,Incidence ,General Medicine ,Disease ,Meningitis, Cryptococcal ,Surgery ,Patient management ,Screening programme ,Survival Rate ,Cryptococcus ,South Africa ,Health care ,medicine ,Antiretroviral treatment ,Humans ,Mass Screening ,Intensive care medicine ,business ,Cryptococcal meningitis ,Clinical treatment - Abstract
In South Africa, the incidence of HIV-associated cryptococcal meningitis remains high despite the increased coverage of antiretroviral treatment, and in routine care settings, the disease is associated with a case-fatality ratio of more than 50%. Laboratory-based screening and pre-emptive antifungal treatment of cryptococcal disease have been suggested for routine implementation as part of the National Strategic Plan for HIV, STIs and TB, 2012 - 2016. In the first phase of a national screening programme, screening will begin at almost 500 healthcare facilities in the Gauteng and Free State provinces, and NHLS laboratories will reflexively test the remnant specimen of any blood sample with a CD4+ T-lymphocyte count
- Published
- 2012
44. SUDEP: Sudden Unexpected Death in Epilepsy on Placebo?
- Author
-
David C, Spencer
- Subjects
Current Literature In Clinical Science - Published
- 2012
45. Radiation therapy for non-aids associated (classic and endemic African) and epidemic Kaposi's sarcoma
- Author
-
Abraham Kuten, Werner R. Bezwoda, Roy Lakier, Patrick MacPhail, Moshe Stein, David C. Spencer, and Janet Dale
- Subjects
Adult ,Male ,Cancer Research ,medicine.medical_specialty ,medicine.medical_treatment ,Acquired immunodeficiency syndrome (AIDS) ,Immunopathology ,medicine ,Mucositis ,Humans ,Radiology, Nuclear Medicine and imaging ,Sida ,Sarcoma, Kaposi ,Aged ,Retrospective Studies ,Aged, 80 and over ,Acquired Immunodeficiency Syndrome ,Radiation ,biology ,business.industry ,Middle Aged ,medicine.disease ,biology.organism_classification ,Symptomatic relief ,Dermatology ,Surgery ,Radiation therapy ,Oncology ,Africa ,Female ,Sarcoma ,Complication ,business ,Follow-Up Studies - Abstract
Purpose : A retrospective analysis of patients with non-AIDS and AIDS-related Kaposi's sarcoma, who were treated with radiation therapy. Methods and Materials : Between 1978 and 1992, 56 patients with one of the three major types (classical, endemic, epidemic) of Kaposi's sarcoma received radiation therapy as their sole treatment modality. Extent of fields, daily fractionation, and total dose were applied on a clinical basis. These lesions received superficial x-ray therapy, Co-60 teletherapy, or 6–8 MeV electron beams. Field sizes depended on extent of the lesion. Total dose administration ranged from 8–12 Gy in one exposure, or a total of 24–30 Gy fractionated over 2–3 weeks. Results : The majority of patients responded to radiation therapy. Symptomatic relief was achieved in 80–100% of patients irrespective of the type of Kaposi's sarcoma, treatment modality, or schedule. Side effects were tolerable in all but three patients with epidemic type Kaposi's sarcoma, who developed severe mucositis. Conclusion : Radiotherapy is the most useful mode of palliative treatment for all forms of Kaposi's sarcoma in southern African patients.
- Published
- 1994
- Full Text
- View/download PDF
46. The 2010 South African guidelines for the management of HIV and AIDS: a review
- Author
-
Desmond J. Martin, Theresa M. Rossouw, Karin Louise Richter, Theunis Johannes Avenant, and David C. Spencer
- Subjects
Program evaluation ,medicine.medical_specialty ,Pathology ,Population ,Developing country ,HIV Infections ,South Africa ,Acquired immunodeficiency syndrome (AIDS) ,medicine ,Humans ,education ,education.field_of_study ,Acquired Immunodeficiency Syndrome ,Scope (project management) ,business.industry ,General Medicine ,Guideline ,Millennium Development Goals ,medicine.disease ,Transparency (behavior) ,CD4 Lymphocyte Count ,Anti-Retroviral Agents ,Caregivers ,Family medicine ,Disease Progression ,business - Abstract
BackgroundSouth African (SA) National Department of Health (DoH) released new guidelines for the management of HIV/AIDS in April 2010. We discuss here controversial issues and operational challenges in the guidelines; the stimulation of debate and contributing to future guidelines; the timing of initiation of antiretroviral treatment, scope and timing of laboratory monitoring and testing of concomitant conditions, operational challenges such as paediatric HIV treatment and nurse-driven care, and procedures relating to the guidelines such as the need for transparency of the guideline committee and the standard of evidence used to develop the guidelines. We welcome comment and sharing of further insights that will contribute to future guidelines. Our motivation stems from the facts that South Africa’s HIV epidemic is not abating; its Millennium Development Goals are not being met; and child and maternal mortality are worse than they were in 1990. 1
- Published
- 2011
47. Radiation therapy in endemic (African) Kaposi's sarcoma
- Author
-
Werner R. Bezwoda, Paul Ruff, Roy Lakier, Abraham Kuten, David C. Spencer, and Moshe Stein
- Subjects
Cancer Research ,medicine.medical_specialty ,Skin Neoplasms ,medicine.medical_treatment ,Disease ,Human immunodeficiency virus negative ,South Africa ,HIV Seronegativity ,medicine ,Humans ,Radiology, Nuclear Medicine and imaging ,Sarcoma, Kaposi ,Kaposi's sarcoma ,Retrospective Studies ,Response rate (survey) ,Radiation ,business.industry ,Radiotherapy Dosage ,medicine.disease ,Dermatology ,Single fraction ,Surgery ,Radiation therapy ,Oncology ,Sarcoma ,business ,Negroid - Abstract
Purpose : Evaluating the role of radiation therapy in the treatment of the endemic, African variant of Kaposi's sarcoma. A retrospective analysis. Methods and Materials : Between 1978 and 1990, 28 symptomatic African patients with the African Human Immunodeficiency Virus negative type of Kaposi's sarcoma were referred to the Johannesburg General Hospital. Following staging, all patients were treated with radiation therapy. Doses ranged between 8–10 Gy (single fraction) or 14–24 Gy fractionated over 1–3 weeks. Results : Complete and partial regression of cutaneous lesions was achieved in 9 (32%) and 15 (54%) patients, retrospectively. A complete/near-complete alleviation of symptoms was achieved in all patients. Response rate and duration of response was not influenced by age, radiation modality or schedule. Side effects were minimal. Conclusion : Our study emphasizes the high radiosensitivity of the endemic, African type of Kaposi's sarcoma, indicating its usefulness as the treatment of choice for this disease.
- Published
- 1993
- Full Text
- View/download PDF
48. B(I)RD Watching: A Way to Stratify Seizure Risk?
- Author
-
David C. Spencer
- Subjects
medicine.medical_specialty ,business.industry ,Emergency medicine ,medicine ,Neurology (clinical) ,business - Published
- 2014
- Full Text
- View/download PDF
49. Changing treatments for bacterial meningitis
- Author
-
David C. Spencer
- Subjects
National health ,Pediatrics ,medicine.medical_specialty ,medicine.drug_class ,business.industry ,Antibiotics ,medicine.disease ,Anti-Bacterial Agents ,Meningitis, Bacterial ,medicine ,Humans ,Bacterial meningitis ,Steroids ,Neurology (clinical) ,business ,Large group ,Meningitis ,Dexamethasone ,medicine.drug - Abstract
In their article “Nationwide implementation of adjunctive dexamethasone therapy for pneumoccal meningitis” ( Neurology 2010;75:1533–1539), Brouwer and coworkers sought to determine whether adults with bacterial meningitis did better when treated with both steroid medication and antibiotics compared with antibiotics alone. When someone is brought to the emergency room with bacterial meningitis, they are quickly given antibiotics while the doctors do more tests to be certain of the type of infection. Recently, it was found that children with certain kinds of bacterial meningitis did better if they were treated with steroid medications along with antibiotics. Some studies have shown that steroids also help adults with bacterial meningitis. In earlier studies in adults, it seemed that adding steroids to antibiotics helped most in a common type of bacterial meningitis called pneumococcal meningitis (PM). In this study, the authors compared a large group of adults with PM who received mostly antibiotics alone to a large group who were treated with steroids and antibiotics. This way, the authors could see which group did better. ### HOW DID THE AUTHORS DO THE STUDY? The study was done in the Netherlands, where there is a national health care system. This made it easier to do the study for 2 reasons: almost all of the laboratory samples to diagnose …
- Published
- 2010
50. Are epilepsy surgery guidelines being followed?
- Author
-
Patreece Suen, Maya Lewinsohn, David C. Spencer, and Gina Phillipi
- Subjects
medicine.medical_specialty ,Academic Medical Centers ,Neurology ,business.industry ,General surgery ,Good control ,Guideline ,Articles ,medicine.disease ,Neurosurgical Procedures ,Clinical Practice ,Epilepsy ,Drug treatment ,Pharmacotherapy ,Epilepsy, Temporal Lobe ,Practice Guidelines as Topic ,Medicine ,Humans ,Epilepsy surgery ,Neurology (clinical) ,Guideline Adherence ,business ,Referral and Consultation - Abstract
Most patients with epilepsy have good control of seizures using medications. However, up to 1/3 of epilepsy patients still have seizures despite trying several medications. Evidence has shown that surgery can be an effective way of treating temporal lobe epilepsy (TLE) that does not respond to medications. In 2003, this led the American Academy of Neurology (AAN) to recommend that patients with TLE whose seizures did not respond to drug treatment should consider surgery. They released a clinical practice guideline (CPG) to alert doctors to this information. The goal of the study by Haneef et al.1 was to find out if the AAN′s recommendations led to quicker referrals to epilepsy centers. The researchers collected data about epilepsy patients sent to their center (University of California, Los Angeles) between January 1995 and September 1998, and compared them to information about patients sent 10 years later (between January 2005 and September 2008). They were interested in seeing whether the guidelines resulted in earlier referrals of patients for epilepsy surgery. To focus on possible surgery candidates, they did not include patients who were referred for other reasons such as those who just recently started having seizures or those who had epilepsy surgery before. The time it took for doctors to refer epilepsy patients for surgery evaluation was defined as the length of unsuccessful drug therapy. For their report, the …
- Published
- 2010
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.