Effects of High Spinal Anesthesia on Cerebral Circulation and Metabolism in Man12

Mean arterial blood pressureThe MABP in the normotensive group fell from 93 to 63 mm.Hg during high spinal anes- thesia.The decrease in mean blood pressure for the four hypertensives was from 158 to 79 mm.Hg.In the double control group the change was from 100 to 106 mm.Hg.The marked decrease in the normotensive spinal anesthesia group is highly significant when compared to the variation in the double controls. The cerebral blood flowThe mean CBF in the normotensive group did not change significantly during high spinal anes- thesia.The prespinal value was 45 ml. per 100