Introduction Methods and Results

Natural Insomnia Program

Effective Home Remedies to Cure Insomnia

Get Instant Access

Penicillin Epilepsy Amygdala Kindling Discussion

Primary Generalized Epilepsy Localization-Related Epilepsies Conclusions References introduction

The two main sleep states, nonrapid eye movement (NREM) sleep and rapid eye movement (REM) sleep, have different physiological components and contrasting effects on generalized ictal and interictal discharges (IIDs). Epileptiform discharges are likely to propagate during NREM sleep, including its synchronized electroencephalographic (EEG) transients, such as K-com-

Epilepsy and Sleep: Physiological and Clinical Relationships

Copyright © 2001 by Academic Press. All rights of reproduction in any form reserved.

plexes and sleep spindles, and its transitional "drowsy" EEG arousal periods. In contrast, REM sleep, with its asynchonous cellular discharge patterns and skeletal motor paralysis, is resistant to propagation of epileptic EEG potentials and to clinical motor accompaniment even though focal IID persists at this time.

The contrasting effects of NREM and REM on IIDs and clinically evident seizures are to some extent nonspecific with respect to epileptic syndrome (Shouse et al., 1996), defined by seizure type, etiology, and clinical course (Commission Report, 1989). On the other hand, clinically evident seizures, particularly generalized tonic-clonic or myoclonic convulsions, occur mainly during NREM sleep, mainly during drowsy wakefulness, or randomly in the sleep-wake cycle depending on epileptic syndrome (e.g., Janz, 1962). Interictal discharges are less likely to propagate and to lead to a clinically evident seizure during intact REM sleep than in any other state regardless of epileptic syndrome (e.g., Sammaritano et al., 1991; Shouse et al., 1989, 1996).

The clinical observations raise three questions that this chapter addresses:

(1) Which characteristics of NREM account for the activation of IIDs?

(2) Which characteristics of REM sleep suppress them? (3) How do the physiological mechanisms of specific sleep-waking state components interact with epileptic seizure pathology to provoke clinically evident seizures at different times?

Was this article helpful?

0 0
Sleeping Sound

Sleeping Sound

Get All The Support And Guidance You Need To Be A Success At Sleeping Well. This Book Is One Of The Most Valuable Resources In The World When It Comes To Getting The Rest You Need For Good Health.

Get My Free Ebook

Post a comment