[Clinical studies on prevention of spinal hypotension and aortocaval compression during elective cesarean section (author's transl)].
Maternal blood pressures, maternal and fetal blood-gas values, induction delivery intervals (I-D intervals) and Apgar scores were determined in 60 cases of elective cesarean section under spinal anesthesia. The procedures were as follows: In the right lateral position on an operating table, the intravenous drip infusion of 6 per cent hydroxyethyl starch solution (12 ml/kg) for 30 minutes prior to spinal anesthesia and the intramuscular injection of ephedrine (0.5 mg/kg) 15 minutes before spinal anesthesia were performed. Immediately after the anesthesia, on the left semilateral position the operation was started (group S). The same studies as group S were made in cases of no reduced blood pressure without ephedrine (group E), and cases of combined use of oxygen inhalation (group O and OII). No significant reduction of blood pressure was noted in group S and O. Fetal acid-base status and Apgar scores were favorable and had no correlation with I-D intervals in any groups. It is suggested that the uteroplacental circulation in group O and E was maintained more or less smoothly than that in group S. Oxygen inhalation led to a significant increase in fetal PO2 and the improvement of 5 minutes Apgar score. On performing elective cesarean section under spinal anesthesia, it may be advisable to take the procedures of group OII (Oxygen flow: 31/min., through a nasal cannula) and to make mother respire closing their mouths.
D000137:Acid-Base Imbalance / Q000517:prevention & control; D000775:Anesthesia, Spinal; D002585:Cesarean Section; D005260:Female; D005312:Fetal Blood / Q000378:metabolism; D006801:Humans; D007022:Hypotension / Q000517:prevention & control*; D007231:Infant, Newborn; D007744:Obstetric Labor Complications / Q000517:prevention & control*; D010100:Oxygen / Q000097:blood; D011247:Pregnancy; D013927:Thrombosis / Q000517:prevention & control*; D014682:Vena Cava, Inferior
D010100:Oxygen