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以下由机器智能翻译，仅供参考。 1. The Relationship of Spinal Anesthesia Dosing Based on Thecal Sac Area to Anesthetic Failure in Lumbar Surgery 基于椎管囊面积的椎管内麻醉剂量与腰椎手术麻醉失败的关系 Greater thecal sac volumes are associated with an increased risk of spinal anesthesia (SA) failure. The thecal sac cross-sectional area accurately predicts thecal sac volume. The thecal sac area may be used to adjust the dose and prevent anesthetic failure. We aim to assess the rate of SA failure in a prospective cohort of lumbar surgery patients who receive an individualized dose of bupivacaine based on preoperative measurement of their thecal sac area. Adjusting the dose of SA according to thecal sac area significantly reduces the rate of SA failure in patients undergoing lumbar spine surgery. 椎囊容积越大，脊髓麻醉（SA）失败的风险越高。椎囊横截面积可准确预测椎囊体积。椎囊区域可用于调整剂量并防止
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