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Clinical Neuroscience

MARCH 30, 2019

The yield of electroencephalography in syncope

NALBANTOGLU Mecbure, TAN Ozturk Ozlem

Introduction - Syncope is defined as a brief transient loss of consciousness due to cerebral hypoperfusion. Although the diagnosis of syncope is based on a thorough history and examination, electroencaphalography (EEG) is also an important investigational tool in the differential diagnosis in this group of patients. In this study we aimed to identify the diagnostic value of EEG in patients with syncope. Methods - We retrospectively examined EEG recordings of 288 patients with the diagnosis of syncope referred to the Cankiri State Hospital EEG laboratory, from January 2014 to January 2016. The EEG findings were classified into 6 groups as normal, epileptiform discharges (spike and sharp waves), generalized background slowing, focal slowing, hemispherical asymmetries, and low amplitude EEG tracing. The EEGs were separated according to gender and age. Results - Total of 288 patients were included in this study, 148 were females (51.4%) and 140 (48.6%) were males. Among all the EEG reports, 203 (70.5%) were normal, 8 of them (2.8%) showed generalized background slowing and 7 (2.4%) demonstrated focal slow waves. Epileptiform discharges occured among 13 patients (4.5%). Hemispherical asymmetries were detected in 10 patients (3.5%) and low amplitude EEG tracing in 47 patients (16.3%). There was no significant difference between age groups in EEG findings (p=0.3). Also no significant difference was detected in EEG results by gender (p=0.2). Discussion - Although the diagnosis of syncope, epilepsy and non-epileptic seizures is clinical diagnosis, EEG still remains additional method

Clinical Neuroscience

JUNE 10, 2004

[Diagnosis of epilepsy]

JANSZKY József

[0.5-1% of the population suffers from epilepsy, while another 5% undergoes diagnostic evaluations due to the possibility of epilepsy. In the case of suspected epileptic seizures we face the following questions: Is it an epileptic seizure? The main and most frequent differential- diagnostic problems are the psychogenic non-epileptic seizures ("pseudo-seizures") and the convulsive syncope, which is often caused by heart disorders. Is it epilepsy? After an unprovoked seizure, the information on recurrence risk is an important question. The reoccurrence is more possible if a known etiological factor is present or the EEG shows epileptiform discharges. After an isolated epileptic seizure, the EEG is specific to epilepsy in 30-50% of cases. The EEG should take place within 24 hours postictally. If the EEG shows no epileptiform potentials, a sleep-EEG is required. What is the cause of seizures? Hippocampal sclerosis, benign tumors, and malformations of the cortical development are the most frequent causes of the focal epilepsy. Three potentially life-threatening conditions may cause chronic epilepsy: vascular malformations, tumors, and neuroinfections. The diagnosis in theses cases can usually be achieved by MRI, therefore, MRI is obligatory in all epilepsies starting in adulthood. The presence of epileptogenic lesion has a prognostic significance in treatment. If the MRI shows a circumscribed lesion then the pharmacological treatment will likely to be unsuccessful, while surgery may result in seizure freedom. The new and quantitative MRI techniques, such as volumetry, T2-relaxometry, MR-spectroscopy, and functional MRI play a growing role in the epilepsy diagnosis.]

Lege Artis Medicinae

OCTOBER 20, 2003

[MOTOR VEHICLE ACCIDENT WITH COMPLETE LOSS OF CONSCIOUSNESS DUE TO VASOVAGAL SYNCOPE]

VARGA Emma, WÓRUM Ferenc, SZABÓ Zoltán, VARGA Mihály, BARTA Kitti, LŐRINCZ István

[INTRODUCTION - Vasovagal syncope is one of the most common causes of complete or partial loss of consciousness, thus it might cause harm to the patients themselves or innocent bystanders while driving a car. CASE REPORT - In our case report we introduce the case of a 60-year-old man who was admitted to hospital after a serious motor vehicle accident due to loss of consciousness. We demonstrate the process and results of complete cardiologic and neurological assessment. Our case report illustrates the importance of recognition of patients with a high risk for incapacitating symptoms due to vasodepressor type vaso vagal syncope and the use of head-up tilt-table test to determine the diagnosis and to guide combined management. CONCLUSION - As transient loss of consciousness during driving may cause potentially fatal accident, it has to be taken into consideration during decision making for issue of driving license in patients with vaso vagal syncope.]

Lege Artis Medicinae

AUGUST 20, 2003

[Motor vehicle accident with complete loss of consciousness due to vasovagal syncope]

VARGA Emma, WÓRUM Ferenc, SZABÓ Zoltán, VARGA Mihály, BARTA Kitti, LŐRINCZ István

[INTRODUCTION - Vasovagal syncope is one of the most common causes of complete or partial loss of consciousness, causing harm to drivers or innocent bystanders. CASE REPORT - In our case, we report the case of a 60-year-old man who was admitted to hospital after a serious motor vehicle accident due to loss of consciousness. The process and results of complete cardiologic and neurological assessment are presented. The case report illustrates the importance of recognition of patients with a high risk for incapacitating symptoms due to vasodepressor type vasovagal syncope as well as the use of head-up tilt-table test to determine the diagnosis and also to guide combined management. CONCLUSION - As transient loss of consciousness during driving may cause potentially fatal accident, it has to be taken into consideration during decision making when issuing driving license for patients with vasovagal syncope.]

Lege Artis Medicinae

MARCH 20, 2002

[Cough syncope]

AVRAMOV Katalin, MAYER Péter, KISS Éva, PAPRIKA Dóra, ZÖLLEI Éva, VÉCSEI László, RUDAS László

[Cough syncope is an infrequently diagnosed form of situational syncope. Most of the reported cases occurs among middle-aged or elderly overweight males, suffering from chronic obstructive lung disease. In our report of four cases we demonstrate the underlying mechanism of cough syncope. Hemodynamic recordings at the time of simulated cough attacks demonstrated the equalisation of the arterial and central venous pressures with consequent cerebral hypoperfusion. The first case illustrates the difficulties of the diagnostic work-up and the confounding effects of the co-existing arrhythmia. The second and fourth cases draw attention to the relationship between cough syncope and accidents. All four patients suffered from chronic obstructive pulmonary disease resulting from heavy smoking which seems to be the most important underlying factor of this syndrome.]