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Sixty patients, aged 65–84 yr, undergoing minor urological surgery under spinal anaesthesia remained sitting for 2 (group 1, n=15), 5 (group 2, n=15), 10 (group 3, n=15), or 20 (group 4, n=15) min after completion of the subarachnoid administration of 3 ml of a 0.5% hyperbaric bupivacaine solution. They were then placed in the supine position. Analgesia levels were assessed bilaterally using pinprick...