Changes in posterior breathing frequency cause epidural - spinal anesthesia and sedation at some point in time Chart 3.5: Difference in breathing rate over time compared with the time T0 - 0, 5 0, 5 1, 5 5 10 15 20 25 30 35 40 45 50 55 60 nhom I nhom II Group I Group II 15 The above chart shows that the breathing rate in group I decreased after spinal anesthesia at the time after spinal anesthesia at 25 minutes to 45 minutes with significant reduction in time (p<0.05).