Abstract
Summary The nycthemeral organization of the waking-sleep cycle is studied in control rats and in rats with an end-to-side portacaval shunt. In control rats, no modification was observed in the waking-sleep cycle throughout the experimental period neither during the diurnal nor nocturnal period. In rats with portacaval shunts, diurnal and nocturnal electrophysiological modifications are observed during the postoperative period, which affect principally the total duration, the number of phases and the mean duration of the phases of waking, slow-wave sleep and paradoxical sleep. These results are in accordance to previous work, showing that the electrophysiological expression of experimental hepatic encephalopathy is both diurnal and nocturnal. The principla neurophysiological, biochemical and neurochemical hypotheses which might explain the apparition and installation of these representative and electrophysiological disturbances of post-shunt encephalopathy are discussed.
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