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Your search keyword '"Velakoulis, Dennis"' showing total 163 results
Start Over Author "Velakoulis, Dennis" Publisher elsevier b.v.
163 results on '"Velakoulis, Dennis"'

2. Neuropsychological function in psychosis of epilepsy

Author

Allebone, James, Kanaan, Richard A., Rayner, Genevieve, Maller, Jerome, O’Brien, Terence J., Mullen, Saul A., Cook, Mark, Adams, Sophia J., Vogrin, Simon, Vaughan, David N., Kwan, Patrick, Berkovic, Samuel F., D’Souza, Wendyl J., Jackson, Graeme, Velakoulis, Dennis, and Wilson, Sarah J.

Published
2023
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9. The clinical utility of exome sequencing and extended bioinformatic analyses in adolescents and adults with a broad range of neurological phenotypes: an Australian perspective

Author

Eratne, Dhamidhu, Schneider, Amy, Lynch, Ella, Martyn, Melissa, Velakoulis, Dennis, Fahey, Michael, Kwan, Patrick, Leventer, Richard, Rafehi, Haloom, Chong, Belinda, Stark, Zornitza, Lunke, Sebastian, Phelan, Dean G., O'Keefe, Melanie, Siemering, Kirby, West, Kirsty, Sexton, Adrienne, Jarmolowicz, Anna, Taylor, Jessica A., Schultz, Joshua, Purvis, Rebecca, Uebergang, Eloise, Chalinor, Heather, Creighton, Belinda, Gelfand, Nikki, Saks, Tamar, Prawer, Yael, Smagarinsky, Yana, Pan, Tianxin, Goranitis, Ilias, Ademi, Zanfina, Gaff, Clara, Huq, Aamira, Walsh, Maie, James, Paul A., Krzesinski, Emma I., Wallis, Mathew, Stutterd, Chloe A., Bahlo, Melanie, Delatycki, Martin B., and Berkovic, Samuel F.

Published
2021
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26. Increased cortical thickness in nodes of the cognitive control and default mode networks in psychosis of epilepsy.

Author

Allebone, James, Wilson, Sarah J, Bradlow, Richard C J, Maller, Jerome, O'Brien, Terry, Mullen, Saul A, Cook, Mark, Adams, Sophia J, Vogrin, Simon, Vaughan, David N, Connelly, Alan, Kwan, Patrick, Berkovic, Samuel F, D'Souza, Wendyl J, Jackson, Graeme, Velakoulis, Dennis, and Kanaan, Richard A

Abstract

Objective: To explore the cortical morphological associations of the psychoses of epilepsy.Methods: Psychosis of epilepsy (POE) has two main subtypes - postictal psychosis and interictal psychosis. We used automated surface-based analysis of magnetic resonance images to compare cortical thickness, area, and volume across the whole brain between: (i) all patients with POE (n = 23) relative to epilepsy-without psychosis controls (EC; n = 23), (ii) patients with interictal psychosis (n = 10) or postictal psychosis (n = 13) relative to EC, and (iii) patients with postictal psychosis (n = 13) relative to patients with interictal psychosis (n = 10).Results: POE is characterised by cortical thickening relative to EC, occurring primarily in nodes of the cognitive control network; (rostral anterior cingulate, caudal anterior cingulate, middle frontal gyrus), and the default mode network (posterior cingulate, medial paracentral gyrus, and precuneus). Patients with interictal psychosis displayed cortical thickening in the left hemisphere in occipital and temporal regions relative to EC (lateral occipital cortex, lingual, fusiform, and inferior temporal gyri), which was evident to a lesser extent in postictal psychosis patients. There were no significant differences in cortical thickness, area, or volume between the postictal psychosis and EC groups, or between the postictal psychosis and interictal psychosis groups. However, prior to correction for multiple comparisons, both the interictal psychosis and postictal psychosis groups displayed cortical thickening relative to EC in highly similar regions to those identified in the POE group overall.Significance: The results show cortical thickening in POE overall, primarily in nodes of the cognitive control and default mode networks, compared to patients with epilepsy without psychosis. Additional thickening in temporal and occipital neocortex implicated in the dorsal and ventral visual pathways may differentiate interictal psychosis from postictal psychosis. A novel mechanism for cortical thickening in POE is proposed whereby normal synaptic pruning processes are interrupted by seizure onset. [ABSTRACT FROM AUTHOR]

Published
2022
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45. Personality profiles differ between patients with epileptic seizures and patients with psychogenic non-epileptic seizures.

Author

Leong, Michelle, Wang, Albert D, Trainor, David, Johnstone, Ben, Rayner, Genevieve, Kalincik, Tomas, Roos, Izanne, Kwan, Patrick, O'Brien, Terence J, Velakoulis, Dennis, and Malpas, Charles B

Abstract

Purpose: Psychogenic non-epileptic seizures (PNES) and epileptic seizures (ES) are often difficult to differentiate, leading to incorrect or delayed diagnosis. The aim of the study was to determine whether patients of these two diagnostic groups possess different personality profiles, and whether they could be used to efficiently screen for PNES in clinical settings.Methods: Collection of data was conducted on 305 patients who completed the NEO-Five Factor Inventory questionnaire during a Video EEG Monitoring admission to the Royal Melbourne Hospital between 2002-2017. Personality differences were investigated using Bayesian linear mixed effects models, with receiver operating characteristic curve analysis computed to evaluate diagnostic accuracy.Results: The 'openness to experience' domain (BF10 = 21.55, d = -0.43 [95% CI -0.71, -0.17]) and the 'aesthetic interest' facet (B10 = 7.98, d= -0.39 [95% CI -0.66, -0.12]) were the only personality factors demonstrating strong evidence for a group difference, with patients with PNES having higher scores compared to the ES group. ES patients had lower scores on these measures compared to the normal population, while PNES patients did not. Both openness to experience and aesthetic interest showed poor sensitivities (53%, 46% respectively) and specificities (69%, 46% respectively) for classifying PNES and ES patients.Conclusion: While openness and aesthetic interests differ greatly between PNES and ES groups, low sensitivity and specificity suggests their use is limited in a clinical setting. Nevertheless, these findings open up new avenues of research using modern personality models to further understand patients with epilepsy and related presentations. [ABSTRACT FROM AUTHOR]

Published
2019
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47. MRI morphology of the hippocampus in drug-resistant temporal lobe epilepsy: Shape inflation of left hippocampus and correlation of right-sided hippocampal volume and shape with visuospatial function in patients with right-sided TLE.

Author

Yoo, Jae-Gon, Jakabek, David, Ljung, Hanna, Velakoulis, Dennis, van Westen, Danielle, Looi, Jeffrey C.L., and Källén, Kristina

Abstract

• Treatment-resistant temporal lobe epilepsy patients may have hippocampal surgery. • Pre-surgery MRI measurements of hippocampal shape & volume can quantify morphology. • Contralateral shape inflation of the left hippocampus in right-sided TLE was found. • This inflation may result from functional compensation &/or abnormal tissue. • Right-sided TLE hippocampal structure is correlated with visuospatial function. We sought to quantify the morphology in vivo of hippocampi in patients with drug resistant temporal lobe epilepsy (TLE) via magnetic resonance imaging (MRI), prior to temporal lobe resection, and the correlation of surface-based shape analysis of morphology and clinical cognitive function. Thirty patients with drug-resistant TLE and twenty healthy controls underwent clinical neuropsychological testing, and brain MRI at Lund University Hospital prior to hippocampal resection. A neuroradiologist categorised radiological findings into normal hippocampus, subtle changes or definite hippocampal sclerosis. We manually segmented MRI of the hippocampus of participants using ANALYZE 11.0 software; and analysed hippocampal shape using SPHARM-PDM software. For radiologist visual-ratings of definite left hippocampal sclerosis in those with left-sided TLE, hippocampal volumes were significantly smaller compared to normal controls. In right-sided TLE we found contralateral shape inflation of the left hippocampus, partially confirming previous shape analytic studies of the hippocampus in TLE. We found significant correlation of volume and surface deflation of the right hippocampus in right-sided TLE with reduced performance on the two right-lateralised visuospatial memory tests, the Rey Complex Figure Test (Immediate and Delayed recall) and the Recognition Memory Test for faces. Decreased hippocampal volume was correlated with poorer performance on these tasks. The morphology of the hippocampus can be quantified via neuroimaging shape analysis in TLE. Contralateral shape inflation of the left hippocampus in right-sided TLE is intriguing, and may result from functional compensation and/or abnormal tissue. In right-sided TLE, hippocampal structural integrity, quantified as hippocampal shape, is correlated with lateralised visuospatial function. [ABSTRACT FROM AUTHOR]

Published
2019
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48. Supranutritional Sodium Selenate Supplementation Delivers Selenium to the Central Nervous System: Results from a Randomized Controlled Pilot Trial in Alzheimer's Disease.

Author

Cardoso, Barbara R., Roberts, Blaine R., Malpas, Charles B., Vivash, Lucy, Genc, Sila, Saling, Michael M., Desmond, Patricia, Steward, Christopher, Hicks, Rodney J., Callahan, Jason, Brodtmann, Amy, Collins, Steven, Macfarlane, Stephen, Corcoran, Niall M, Hovens, Christopher M., Velakoulis, Dennis, O'Brien, Terence J., Hare, Dominic J., and Bush, Ashley I.

Abstract

Insufficient supply of selenium to antioxidant enzymes in the brain may contribute to Alzheimer's disease (AD) pathophysiology; therefore, oral supplementation may potentially slow neurodegeneration. We examined selenium and selenoproteins in serum and cerebrospinal fluid (CSF) from a dual-dose 24-week randomized controlled trial of sodium selenate in AD patients, to assess tolerability, and efficacy of selenate in modulating selenium concentration in the central nervous system (CNS). A pilot study of 40 AD cases was randomized to placebo, nutritional (0.32 mg sodium selenate, 3 times daily), or supranutritional (10 mg, 3 times daily) groups. We measured total selenium, selenoproteins, and inorganic selenium levels, in serum and CSF, and compared against cognitive outcomes. Supranutritional selenium supplementation was well tolerated and yielded a significant (p < 0.001) but variable (95% CI = 13.4-24.8 μg/L) increase in CSF selenium, distributed across selenoproteins and inorganic species. Reclassifying subjects as either responsive or non-responsive based on elevation in CSF selenium concentrations revealed that responsive group did not deteriorate in Mini-Mental Status Examination (MMSE) as non-responsive group (p = 0.03). Pooled analysis of all samples revealed that CSF selenium could predict change in MMSE performance (Spearman's rho = 0.403; p = 0.023). High-dose sodium selenate supplementation is well tolerated and can modulate CNS selenium concentration, although individual variation in selenium metabolism must be considered to optimize potential benefits in AD. The Vel002 study is listed on the Australian and New Zealand Clinical Trials Registry ( http://www.anzctr.org.au /), ID: ACTRN12611001200976. [ABSTRACT FROM AUTHOR]

Published
2019
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