COMPARISON OF THE ANALGESIC EFFECTS OF INTRATHECAL CLONIDINE AND INTRATHECAL MORPHINE AFTER SPINAL ANAESTHESIA IN PATIENTS UNDERGOING TOTAL HIP REPLACEMENT

• Published in: British Journal of Anaesthesia Vol. 71; no. 5; pp. 661 - 664
• Main Authors: FOGARTY, D.J., CARABINE, U.A., MILLIGAN, K.R.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 01.11.1993; Oxford University Press
• Subjects: Adult; Aged; Aged, 80 and over; Anaesthetic techniques: spinal; Anaesthetics local: bupivacaine; Analgesics; Analgesics morphine; Anesthesia, Spinal; Biological and medical sciences; Bupivacaine; Clonidine - administration & dosage; Clonidine - adverse effects; Female; Hip Prosthesis; Humans; Injections, Spinal; Male; Medical sciences; Middle Aged; Morphine - administration & dosage; Morphine - adverse effects; Neuropharmacology; Pain Measurement; Pain, Postoperative - drug therapy; Pharmacology. Drug treatments; Pharmacology: clonidine; Analgesics morphine; Anaesthetics local: bupivacaine; Pharmacology: clonidine; Anaesthetic techniques: spinal; Human; Postoperative; α2-Adrenergic receptor; Agonist; Morphine; Opiates; Narcotic analgesic; Intrathecal administration; Chemotherapy; Analgesic; Orthopedic surgery; Pain; Treatment; Comparative study
• ISSN: 0007-0912; 1471-6771
• DOI: 10.1093/bja/71.5.661

We have studied the anaesthetic and analgesic properties of intrathecal clonidine and intrathecal morphine in patients undergoing total hip replacement under spinal anaesthesia. After routine spinal anaesthesia with 0.5% plain bupivacaine 2.75 ml, patients were allocated randomly to receive intrathecal clonidine, morphine or saline (control) as adjuvant to the bupivacaine. Postoperative analgesic effects were measured by consumption of morphine via patient-controlled analgesia and visual analogue pain scores. Both intrathecal clonidine and intrathecal morphine prolonged the time to first analgesia compared with saline (mean 278 (SD 93.2) min, 498 (282.4) min and 54 (61.9) min, respectively) (P < 0.001). Total morphine consumption on the first night after operation was significantly less in the intrathecal morphine group. There were no differences between the donidine and the control group. Intrathecal clonidine prolonged the duration of spinal analgesia, but was markedly inferior to the intrathecal morphine in providing subsequent postoperative analgesia. (Br. J. Anaesth. 1993; 71: 661–664)