Efficacy of Patient-Controlled Anagesia for Management of Pain after Abdominal Operations.

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Abstract
In order to control pain during the early post-operative period, patient-controlled analgesia (PCA) with buprenorphine as an analgesic drug was applied in 23 patients undergoing abdominal operations. With this "on demand" system, the patient was allowed to self-administer narcotic analgesic medication using a programmable infusion pump. Overdose could be minimized with a mandatory lock-out interval between allowable injections. Average total requirement of buprenorphine was 0.355 mg at 48 hr after operation. Nineteen of the 23 (82.6%) patients characterized their pain control as "excellent" or "good". In these patients there existed high correlation between the total number of patient attempts and the number of successful injections. The PCA system was thought to provide improved pain relief at smaller total drug dosages. In addition, earlier and greater spontaneous physical activity was maintained with PCA therapy. The potential for overdose could be minimized, and thereby PCA appears to be an efficacious and safe method of providing for postoperative pain relief.

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