Publications by authors named "Viswanathan Lg"

A 16-year-old adolescent girl presented with progressive walking imbalance, uncoordination of her limbs, impaired proprioceptive sensation distal to her wrists and ankles, and sensorineural hearing loss. Her evaluation revealed diffuse cerebellar atrophy, a demyelinating neuropathy, and hypergonadotropic hypogonadism. In this article, we present a systematic approach to a patient with early-onset ataxia, cerebellar atrophy, and demyelinating neuropathy.

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  • The study investigated how COVID-19 disruptions affected neuroscience research projects and young researchers in India through an online survey targeting medical trainees, post-docs, PhD students, and early career faculty.
  • A total of 504 valid responses revealed that over 83% of participants experienced negative impacts on their research, with one-third noting delays and many adapting their methodologies due to the pandemic.
  • The findings highlighted significant challenges, particularly for those involved in prospective studies, emphasizing the need for focused support for neuroscience research in the post-pandemic landscape.
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  • Magnetoencephalography (MEG) can help identify regions of seizure activity in patients with drug-resistant epilepsy (DRE) who have normal MRI scans.
  • A study of 73 patients showed that MEG effectively localized seizure sources in 70% of cases, with a moderate agreement in findings when compared to video electroencephalography (VEEG).
  • The results suggest that MEG is a valuable tool for presurgical evaluations in DRE patients, especially when MRI results are inconclusive.
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Background: The analysis of EEG demands expertise and keen observation to distinguish epileptiform discharges from benign epileptiform variants (BEVs), a frequent source of erroneous interpretation. The prevalence of BEVs varies based on geographical, racial, and ethnic characteristics. However, most data on BEVs originates from Western populations, and additional studies on different cohorts would enrich the existing literature.

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  • Subacute sclerosing panencephalitis (SSPE) is a serious neurological disorder linked to persistent measles virus infection, with its effects on heart function remaining inadequately studied.
  • This research involved 30 SSPE patients and matched controls in Southern India, evaluating heart rate variability (HRV) through detailed electrocardiogram analysis.
  • The results showed that SSPE patients had significantly lower HRV compared to controls, indicating autonomic dysfunction, which may correlate with the severity of the disease.
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Objective: The alpha rhythm has been a subject of research for the past few decades. Right-left alpha amplitude asymmetry is a common phenomenon. Several explanations have been proposed to explain this asymmetry, including differences in skull thickness.

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  • Approximately 40% of pediatric epilepsies are genetic, with sodium channel mutations being a common cause, particularly noted in the SCN1A gene, which is associated with various epilepsy types.
  • This study analyzed 23 children with sodium channel mutations attending a center in Southern India, documenting their clinical signs, EEG results, and treatment impacts.
  • The most frequent seizure type was focal with impaired awareness, and associated non-epileptic features included microcephaly and movement disorders, highlighting the need for personalized management in affected patients.
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Objectives: This study aimed to localise the eloquent cortex and measure evoked field (EF) parameters using magnetoencephalography in patients with epilepsy and tumours near the eloquent cortex.

Methods: A total of 41 patients (26 with drug-refractory epilepsy and 15 with tumours), with a mean age of 33 years, were recruited. Visual evoked field (VEF), auditory evoked field (AEF), sensory evoked field (SSEF), and motor-evoked field (MEF) latencies, amplitudes, and localisation were compared with those of a control population.

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Background: A third of people with juvenile myoclonic epilepsy (JME) are drug-resistant. Three-quarters have a seizure relapse when attempting to withdraw anti-seizure medication (ASM) after achieving seizure-freedom. It is currently impossible to predict who is likely to become drug-resistant and safely withdraw treatment.

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  • Corpus callosotomy (CC) is a surgical procedure that aims to help patients with drug-resistant epilepsy (DRE) by stopping drop attacks and preventing falls.* -
  • A study reviewed the records of 17 patients who underwent CC, with a majority being young children, and noted improvements in seizure control post-surgery, including complete cessation of drop attacks in all patients.* -
  • The findings suggest that complete CC is more effective for controlling drop attacks compared to partial CC and can lead to a significant reduction in overall seizure frequency.*
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Background: High-level evidence for using steroids in epileptic encephalopathy (EE), other than West syndrome (WS), is lacking. This study investigated the efficacy and safety of pulse intravenous methylprednisolone (IVMP) in EE other than WS.

Methods: This is an open-label evaluator-blinded randomised controlled study.

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Introduction: Video Electroencephalography (VEEG) is crucial for presurgical evaluation of Drug Refractory Epilepsy (DRE). The yield of VEEG in large volume centers, particularly those situated in Low-and Middle-Income countries (LMIC) is not well studied.

Methodology: We studied 1200 adults with drug resistant focal epilepsy whose seizures were recorded during VEEG in the epilepsy monitoring unit.

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Ring 20 syndrome is a rare cause of refractory epilepsy and non-convulsive status epilepticus in children. We report a patient with Ring 20 syndrome with refractory focal seizures and non-convulsive status epilepticus who showed good treatment response with intravenous steroids. We wish to highlight that intravenous pulse methylprednisolone is a useful treatment strategy in this setting.

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Background: Parieto-occipital (PO) gliosis secondary to perinatal insult, is often associated with neurologic sequelae such as epilepsy, which can be drug resistant.

Objective: To evaluate the spectrum of epilepsy among patients presenting with seizures in association with PO gliosis and to determine factors that influence the development of epileptic encephalopathy (EE) in these patients.

Methods: We retrospectively evaluated patients aged < 16 years with drug refractory epilepsy and PO gliosis who underwent video electroencephalography (Video EEG).

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Background: Posterior quadrant disconnection (PQD) is an under-utilized surgical technique in the management of refractory epilepsy. There is a dearth of data pertinent to post-PQD seizure outcomes.

Methods: This retrospective study analyzed patients with drug-resistant childhood-onset epilepsy who underwent PQD at our center from 2009 to 2018.

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Objective: P300 is an event-related potential, being explored as an objective tool to assess cognition. This study aimed to investigate the characteristics of auditory and visual P300 in patients with TLE having unilateral HS using electroencephalography (EEG) and to study its correlation with cognition.

Methods: This is a cross-sectional case-control study, where P300 characteristics in thirty patients with unilateral hippocampal sclerosis with refractory epilepsy were compared with fifteen age-, gender-, and years of education-matched healthy controls (M: F-10:5, mean age-28 ± 4.

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  • NMDA receptor encephalitis (NMDARE) is the most common autoimmune encephalitis characterized by symptoms like altered consciousness, seizures, psychiatric issues, and movement disorders, with EEG providing diagnostic insights for some patients.* -
  • In a study of 48 NMDARE patients, younger patients experienced seizures, and the predominant EEG patterns observed included diffuse slowing and generalized rhythmic delta activity, with most findings being non-specific and few cases of unique patterns.* -
  • The study concluded that while EEG findings in NMDARE are varied and often non-specific, they can still be valuable when combined with clinical symptoms for accurate diagnosis and treatment planning.*
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