[Spread of spinal anesthesia with 0.5% isobaric bupivacaine].

The effects of age, weight, height, weight.height ratio, and body mass index on the spread of spinal anesthesia with 3.0 ml of 0.5% isobaric bupivacaine was examined in 185 patients. No significant correlation was found between the spread of analgesia and the age, weight, height, weight.height ratio, or body mass index. A significant correlation was found between the decrease in mean arterial pressure and the height of sensory analgesia (rho = -0.21, P < 0.05) as well as the aging (rho = -0.35, P < 0.001).