Effects of deprivation of the quick-wave sleep in rats with inherited predisposition to audiogenic convulsions

In experiments on rats of Krushinskii-Molodkina line (KM) with genetic predisposition to audiogenic convulsions, effects of the 3- and 6-h periods of the absence of the quick-wave sleep (QS) were studied in animals under natural conditions as well as of selective deprivations of QS on EEG spectral characteristics in the wakening-sleep cycle, on organization of the cycle, and on intensity of convulsive symptoms. The QS deprivation for 3, 6, 9, and 12 h was produced by the classic methods of small platforms or of soft awakening. The data are presented about changes of the cycle parameters in the course of natural and experimental deprivations as well as about the dynamics of restoration of the cycle structure for 12 h of the post-deprivation period. It was established that during and after the QS deprivations (by any duration), in EEG of the hippocampus, caudate nucleus, medial central nucleus of thalamus, somato-sensory, visual and auditory cortex of the KM rat brain, no appearance of the paroxysmal fires was revealed in any of the states of the wakening-sleep cycle. It was also found that the selective QS deprivation did not affect duration of the latent period and parameters of the generalized tonic-clonic audiogenic convulsions. It is stated that in rats of the KM line that have the hidden convulsive syndrome, the used kinds and methods of QS deprivation fail to activate the epileptiform manifestations.