On correlating the fetal heart and brain in the sheep. I. Following recovery from operation II. Following maternal hemorrhage

Fetal sheep brain wave changes during recovery from operations and fetal heart rate and brain wave changes during acute maternal hemorrhage are described. During the first 24 hours after operation, there was a change in fetal brain wave with increasing amplitudes and faster frequencies of brain waves. A fully recovered EEG was not present for at least 24 hours. During acute maternal hemorrhage the heart changes were primarily those of heart rate irregularity with bradycardia being the most common pattern. Brain wave changes occurred early and progressed through a pattern of slower frequencies and decreasing amplitudes to an isoelectric state which always preceded terminal bradycardia.