Group FB ( n = 62 ) received intrathecal fentanyl 25 g plus 3 ml of 0.5 % hyperbaric bupivacaine , Group SB ( n = 62 ) received 0.5 ml normal saline plus 3 ml of 0.5 % hyperbaric bupivacaine and Group TB ( n = 62 ) received intrathecal tramadol 25 mg plus 3 ml of 0.5 % hyperbaric bupivacaine .