Left lateral vs. supine, wedged position for development of block after combined spinal-epidural anaesthesia for Caesarean section.

Abstract

This prospective, randomised controlled trial compared a spinal block developing in the left lateral position (LL), after sitting a combined spinal-epidural for Caesarean section with the woman sitting -- using intrathecal hyperbaric bupivacaine and fentanyl -- with a block developing in the supine, wedged position (SW). The median (IQR) block onset times for loss of cold sensation to T4 bilaterally for LL and SW women were 15 (13-19) and 12 (10.8-14) min, respectively (p = 0.004). Unilateral blocks did not occur in the left lateral group. There were no other significant differences between groups, except the median [range] 1-min Apgar scores, which were 9 [8-10] and 9 [6-9] in the LL and SW groups, respectively (p = 0.04). In summary, the LL position is associated with a relatively slower block onset, but produces a spinal block with similar characteristics to that obtained in the SW position.