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The Effect of Head Compression on FHR, Brain Metabolism and Function

From the Department of Obstetrics and Gynecology, Cornell University Medical College, 1300 York Avenue, New York, NY 10021.

Abstract

The effect of fetal head compression on heart rate, cerebral metabolism and function was studied in 30 sheep experiments. Cerebral oxygen consumption decreased markedly as cerebral blood flow was significantly impaired by the increase in intracerebral pressure and vascular resistance. A fetal bradycardia or tachycardia occurred in 76% of the experiments. The fetal EEG showed a drop-out of faster frequencies, slowing and a decrease in amplitude prior to the onset of an isoelectric (flat) stage. All parameters recovered rapidly after the episode of cerebral ischemia caused by head compression.

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