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要旨
脊髄くも膜下麻酔で施行した5-アミノレブリン酸(5-aminolevulinic acid:5-ALA)内服下の経尿道的膀胱腫瘍切除術(transurethral resection of bladder tumor:TUR-Bt)における術中低血圧の危険因子を後ろ向きに検討した。当院で2020年7月から2023年12月に脊髄くも膜下麻酔で5-ALA内服下TUR-Btを施行した患者は93名であった。術中低血圧の定義を平均血圧(mean blood pressure:mBP)65mmHg未満として,術中低血圧群が74名,非低血圧群が19名となった。多変量解析で,術前麻酔高>第10胸椎(オッズ比3.234,P=0.024),プロポフォールによる鎮静(オッズ比8.607,P=0.012)と手術室入室時mBP<95mmHg(オッズ比3.977,P=0.021)が独立した危険因子であった。脊髄くも膜下麻酔で使用した局所麻酔薬の比重や投与量,穿刺椎間などは危険因子にならなかった。
Background:The risk factors for intraoperative hypotension in a transurethral resection of bladder tumor(TUR-Bt)with 5-aminolevulinic acid(5-ALA)performed under spinal subarachnoid anesthesia are unclear.
Methods:We retrospectively analyzed the cases of the patients who underwent a TUR-Bt with spinal anesthesia under 5-ALA during the period from July 2020 to December 2023 at our institution. Intraoperative hypotension was defined as mean blood pressure(mBP)<65 mmHg. We divided the patients into two groups according to the presence or absence of intraoperative hypotension, and we performed univariate and multivariate analyses using mixed models for variables such as patient background, anesthesia, surgery, and the perioperative period(including the baricity and volume of the local anesthetic used, and the puncture level).
Results:The study population was 93 patients:74 in the hypotensive group and 19 in the non-hypotensive group. The univariate analysis showed significant between-group differences in the estimated glomerular filtration rate(eGFR), preoperative anesthetic level>Th10, the use of sedation with propofol, and mBP at the patient’s entry to the operating room. The multivariate analysis identified the following as independent risk factors for intraoperative hypotension:preoperative anesthetic level>Th10(odds ratio[OR]3.234, P=0.024), sedation with propofol(OR 8.607, P=0.012), and mBP<95 mmHg at the patient’s entry to the operating room(OR 3.977, P=0.021).
Conclusion:Risk factors for intraoperative hypotension in spinal anesthesia did not include the baricity or volume of the local anesthetic used or the level of puncture.

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