LAUSR

Abstract For postoperative acute pain during mastectomy, a few studies have reported the usefulness of an intraoperative local anesthesia instillation technique in which analgesics are injected through a drain placed under the skin, intraoperatively. This study presented a novel administration method, and the efficacy of local instillation anesthesia in male-type chest wall contouring surgery was assessed. Fifty-four patients underwent chest wall contouring surgery under general anesthesia. The 27 patients in each of the study and control groups, with our instillation technique and without the technique were compared, in terms of the maximum numerical rating scale (NRS) score within 24 h after surgery, the postoperative analgesic use frequency, and dosage until 6 d. The analgesic used was a mixture of 5 ml 1% lidocaine hydrochloride, epinephrine (0.05 mg), 10 ml 0.75% bupivacaine, and 10 ml saline. Thereon, 25 ml analgesia was administered from the left and right drain (15-Fr J-VACTM) and infiltrated for 15 min. Both NRS scores of postanesthesia care unit (PACU) discharge and the maximum NRS score within 24 h after PACU discharge were significantly lower in the study group than in the control group (p < 0.001, p = 0.048). The frequency of analgesics administered within 24 h after surgery was significantly lower in the study group than in the control group (p = 0.025). Our anesthesia instillation method for chest wall contouring surgery was effective in relieving acute pain occurring within 24 h after surgery and can be a useful analgesic administration method.