Patients in group E (epidural anesthesia for Caesarean section) received 750-1000 mL of 0,9% NaCI solution (10-15 mL/kg) as infusion in 20-30 minutes. We conducted epidural anesthesia with 18-gauge Tuohy needle at L3-L4 or L4-L5 epidural space by midline approach at sitting position. 3 -5 minutes after injection of 3 ml lidocaine as test-dose, when the patient has no sign of subarachnoid injection like prickling in lower extremities or of intravascular injection like nausea, vomiting, tachicardia, tinnitus, a 20-gauge epidural catheter was inserted to cephalad. We injected 10 ml of 0.5% bupivacaine via epidural catheter. We let the operation begin when sensory and motor blockade were verified. Oxygen of 100% (3 L. min) was administered throughout the operation via nasal cannula.