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BACKGROUND: Clonidine is an alpha(2) adrenoreceptor and imidazoline receptor agonist, which has analgesic, sedative, and minimum alveolar anesthetic concentration-sparing effects. It has been used orally, IV, and epidurally. In spinal surgery, there is a reluctance to use local anesthetic-based epidural analgesia postoperatively because of fears of masking important signs of nerve root or spinal cord injury. METHODS: We randomized 66 patients undergoing uncomplicated decompressive spinal surgery to receive an epidural infusion of either clonidine (Group C) or saline placebo (Group P) postoperatively. Morphine consumption by patient-controlled analgesia device was recorded for 36 h. RESULTS: Morphine consumption was significantly lower in Group C. The mean consumption at 36 h was 35 mg (95% confidence interval 21-50 mg) in Group C, compared with 61 mg (95% confidence interval 48-74 mg) in the control group. Nausea was significantly reduced in Group C (6.5%), when compared with placebo (38.2%). CONCLUSION: Low-dose epidural clonidine significantly reduced the demand for morphine and reduced postoperative nausea with few side effects.

Original publication

DOI

10.1213/ane.0b013e31818e61b8

Type

Journal article

Journal

Anesth Analg

Publication Date

02/2009

Volume

108

Pages

631 - 634

Keywords

Adrenergic alpha-Agonists, Adult, Aged, Analgesia, Epidural, Blood Pressure, Clonidine, Double-Blind Method, Female, Heart Rate, Humans, Hypnotics and Sedatives, Linear Models, Male, Middle Aged, Morphine, Pain Measurement, Pain, Postoperative, Pilot Projects, Postoperative Nausea and Vomiting, Preanesthetic Medication, Spine, Urinary Retention