Preoperative medication with oral morphine sulphate and postoperative pain.

BACKGROUND: The administration of an analgesic drug prior to nociceptive surgical stimulus could result in a better postoperative pain management. The aim of this study was to evaluate the effect of preoperative oral morphine sulphate on postoperative pain relief. METHODS: Sixty patients undergoing major abdominal surgery were randomly assigned to premedication with 0.5 mg/kg oral morphine sulphate (oral morphine group) or 0.05 mg/kg oral midazolam (active placebo group). Primary outcome was efficacy of morphine premedication on opioid administration of IntraVenous Patient Controlled Analgesia (IVPCA) doses, at 4, 24, and 48 hours after completion of surgery and reducing static and dynamic visual analogue scale (sVAS and dVAS) scores. Secondary outcome was the time needed for the recovery of canalization of the gastro-intestinal tract. It was also evaluated fentanyl intraoperative consumption. Statistical analysis was performed by linear regression and student t test. Values of P<0.05 were considered significant. RESULTS: The two groups were comparable with respect to patient characteristics. At 24 and 48 hours post surgery, administered IVPCA doses were reduced in the oral morphine group compared to the active placebo group (P<0.05). Values of sVAS and dVAS were significantly lower in the oral morphine group compared to the active placebo group at all assessment times (P<0.05). Fentanyl consumption was similar in both groups. Needs of a ketorolac rescue dose was greater in the ap versus the om group (21 patients in the ap vs 9 patients in the om group, P<0.001). Mean gastrointestinal canalization did not significantly differ between groups. CONCLUSIONS: In major abdominal surgery, premedication with oral morphine sulphate produces better postoperative pain control and has an opioid-sparing effect without delaying gastrointestinal canalization time.

Acute left ventricular dysfunction due to Tako-tsubo syndrome after induction of general anesthesia.

Tako-tsubo cardiomyopathy is a recently described form of transient ventricular dysfunction that is not associated with coronary vessels obstruction, although its clinical manifestations are often similar to those of myocardial ischemia. This syndrome is possibly due to an excess of catecholamines, and it is associated with emotional and physical stress and surgery. However, the pathophysiological relation to anaesthesia has not yet been clarified. We report a case of Tako-tsubo cardiomyopathy that ensued immediately after induction of general anaesthesia for elective surgery in a patient submitted to laparoscopic cholecystectomy. The patient was first treated as if affected by myocardial ischemia, but a rapidly performed emergency coronary angiography showed normal epicardial coronary vessels with a significant reduction of left ventricular function. The coronary angiography ruled out the diagnosis of typical myocardial ischemia and allowed for the arrival at the correct diagnosis. The transient ventricular ballooning was attributed to the recently described Tako-tsubo syndrome. Prompt treatment allowed control of symptoms, and the patient was safely treated and discharged on day 15. Although it is difficult to identify the cause of this syndrome, it may be argued that, during general anaesthesia and particularly at induction, the imperfect control of catecholamine excess may induce cardiac damage in predisposed subjects.