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This prospective observer-blinded clinical trial is designed to evaluate the effectiveness and the safety of 0.5% ropivacaine 30ml (150mg) administrated via subcutaneous infiltration at incision with or without combination of intraperitoneal spray for analgesia after laparoscopically assisted gastrointestinal surgery.Ninety ASA grade I–III patients were randomized into three groups: Group R1 (29 patients)...
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