effects of clonidine premedication upon postoperative shivering and recovery time in patients with and without opium addiction after elective leg fracture surgeries

background opium is a highly addictive agent and the most common narcotic often misused in iran. the pharmacokinetic of anesthetic drugs in patients with opium addiction is one of the great challenges for anesthesiologists. hemodynamic instability and postoperative side effects are of these challenges which should be managed correctly. objectives in this study we aimed to assess the effects of clonidine upon post anesthesia shivering and recovery time in patients with and without opium addiction after general anesthesia to decrease the subsequent complications related to the shivering and elongation of recovery time.rn patients and methods in a randomized clinical trial, 160 patients candidates for elective leg fracture operations under general anesthesia were studied in four groups of 40 patients: group 1 (placebo 1) were patients without addiction who got placebo 90 minutes before the operation. group 2 (placebo 2) were patients with opium addiction which received placebo as group 1. group 3 (clonidine 1) patients without addiction who got clonidine 90 minutes before the operation and group 4 (clonidine 2) who were opium addicted ones which received clonidine as premedication. results none of the patients with and without addiction in clonidine groups had shivering after the operation but in placebo groups shivering was observed and the difference between clonidine and placebo groups was statistically significant (p < 0.01). recovery time in clonidine groups of patients with and without addiction was less than placebo ones (both p < 0.01) which the magnitude of difference was higher in opium addicted than non-addicted patients (p = 0.04). conclusions premedication with clonidine in patients with and without opium addiction can be effective to decrease the incidence of shivering and recovery time after operation.