Group R war received ropivacaine 0.5% 10mg while group B war received bupivacaine 0.5% 10mg and both groups combined sufentanil 5μg.
Nhóm R ropivacaine 0,5% 10mg, nhóm B bupivacaine 0,5% 10mg, cả 2 nhóm đều kết hợp sufentanil 5µg.