S.H Taravati - Assistant Professor of Anesthesiology, Afzalipour School of Medicine, Kerman University of Medical Sciences, Kerman, Iran
H Satari - Assistant Professor of Anesthesiology, Afzalipour School of Medicine, Kerman University of Medical Sciences, Kerman, Iran
M KHosravi - Resident of Anesthesiology, Afzalipour School of Medicine, Kerman University of Medical Sciences, Kerman, Iran
M SHabani - Assistant Professor of Physiology, Kerman Neuroscience Research Center, Kerman University of Medical Sciences, Kerman, Iran

Background & Aims: Post operative pain is cause of suffering in most patients and can cause a lot of problems. Analgesic effects of many narcotics have been widely studied. In this study, the effects of methadone and morphine on postoperative pain scale following thoracic surgery in opium addict patients were assessed. Methods: In this clinical trial and double blind study, sixty opium addict patients (ASA I, II), aged ۲۰-۶۵ yr, were randomly allocated into two groups. Thirty minutes before induction of general anesthesia the first group received ۰.۱ mg/kg methadone and the second group received ۰.۱ mg/kg morphine. The two groups were assessed and compared in regard to the intensity of pain and meperidine requirement in the first post operative ۲۴ hr. Results: Intensity of post operative pain and meperidine requirement in the methadone group were significantly lower than those in the morphine group (P<۰.۰۱). Conclusion: Administration of ۰.۱mg/kg methadone as premedication for opium addict patients reduces the post operative pain more than morphine. Therefore, premedication with methadone for opium addict patients undergoing thoracic surgery is recommended.

Methadone, Morphine, Meperidine, Post operative pain, Substance abuse, American Society of, Anesthesiologists