Fig. 1. The percentage of patients who did not request analgesia after tourniquet deflation is shown. Patients in the intravenous regional anesthesia clonidine group had a signigicantly longer period of subjective comfort when they required no analgesics compared with the control and intravenous clonidine groups ( P < 0.0001). The control and intravenous clonidine groups were not significantly different.