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Journal Article
Research Support, Non-U.S. Gov't
Electrophysiologic assessment of autonomic function in epilepsy.
Sudden unexpected death associated with epilepsy (SUDEP) is an important clinical problem. Peri-ictal autonomic dysfunction is thought to play a role in SUDEP and few means exist for clinical identification of patients at risk. Sympathetic function was assessed by measuring sympathetic skin responses (SSR) elicited in the hand by auditory or tactile stimulation or by inspiration. Parasympathetic function was assessed by recording the R-R interval (RRI) and determining its variability in subsequent heartbeats. Fifty epilepsy patients had significantly greater SSR amplitudes and latencies than controls. The RRI was shorter in patients than in controls and the mean successive difference (MSD) was less, but significance was not reached. Twenty patients at possible risk for SUDEP (male, generalized seizures, intermittent medication noncompliance, drug and alcohol abuse, traumatic or structural aetiology) differed significantly from controls in SSR and RRI. Epilepsy patients may differ in autonomic function from the general population, and these differences may be relevant to SUDEP. The SSR and the RRI may be a simple means of assessing autonomic function in epilepsy outpatients.
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