Abstract

Acute and chronic observations of the fetal electroencephalogram (EEG) in a fetal sheep preparation revealed two distinct patterns of sleep activity consisting of high-voltage slow activity (HVSA) and low-voltage fast activity (LVFA). A decrease in fetal heart rate, cerebral perfusion pressure, and cerebral blood flow was observed consistently during LVFA when compared to HVSA. There was no significant difference in cerebral metabolism during the sleep stages.

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