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The effects of epidural morphine on the postoperative urinary excretion of catecholamines were studied in patients who underwent upper abdominal sur gery. Either preservative-free morphine, 2 mg in 20 ml of saline (morphine group) or 20 ml of normal saline (saline group) was injected epidurally through a catheter placed in the space between Th 7-8 during surgery. Urine samples were collected just after induction and 5 hours postoperatively. Catecholamines were analyzed with high-performancedoi:10.2302/kjm.34.25 fatcat:ecjaywzpv5aglgmbtaj4j24nia