Effects on systolic arterial pressure at some point after spinal and epidural anesthesia Chart 3.9: Difference in systolic arterial blood pressure over time compared with time T0 - 10 - 5 5 10 15 20 25 30 35 40 45 50 55 60 >60 Chênh lệch mạch theo thời gian so với thời điểm bắt đầu Nhóm I Nhóm II 5 10 15 20 25 30 35 40 45 50 55 60 >60 HATD Nhóm I Nhóm II Group I Group II Group I Group II mmHg 17 We found that systolic arterial pressure after anesthesia was significantly reduced compared to the time T0 in both groups with statistical significance with 99% confidence level (p <0.01).