The Fentanyl group received 0.5 % hyperbaric bupivacaine 0.2 mL + fentanyl 20 g +5 % dextrose 1.4 mL , and the Sufentanil group received 0.5 % hyperbaric bupivacaine 0.2 mL + sufentanil 5 g +5 % dextrose 1.7 mL intrathecally .