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st MEP to monitor neurological injury and can serve as a temporary substitution monitoring technique after MEP is lost. Retrospective cohort analysis using the American College of Surgeons National Surgical Quality Improvement Program database. The objective of this study was to investigate the incidence and risk factors of perioperative complications and mortality in patients undergoing adult spinal deformity (ASD) surgery. Although ASD surgery has been associated with a relatively high complication rate, a focus on p