2604.01656 POSTOP-VTE v1: Transparent Pre-Validation Framework for Post-Operative VTE Risk in Major Abdominal Surgery
POSTOP-VTE v1: We present a pre-validation composite scoring framework for symptomatic, imaging-confirmed VTE within 90 days in adult patients undergoing major abdominal surgery (open or laparoscopic) with LOS >=1 day. Published literature reports 90-day VTE incidence 1-5% depending on cancer status and procedure type [Bahl 2010; Merkow 2011], with effect sizes for individual modifiers reported inconsistently across study designs and grading conventions.