Minimum effective volume of bupivacaine in spinal anesthesia for elective cesarean section. Does it differ with height? A non-randomized parallel study

The volumes of hyperbaric 0.5% bupivacaine with fentanyl which produced effective spinal block in 90% of parturients undergoing cesarean deliveries were 2.62, 2.76 and 2.8 ml in the 3 different height groups respectively.