Risk factors for post-discharge venous thromboembolism in patients undergoing colorectal resection: a NSQIP analysis
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Extended thromboprophylaxis after abdominal and pelvic cancer surgery to prevent venous thromboembolic events (VTE) is recommended but adherence is sub-optimal. Identifying patients at highest risk for post-discharge events may allow for selective extended thromboprophylaxis. The aim of our study was to identify the different risk factors of venous thromboembolism for in-hospital and post-discharge events.
The American College of Surgeons-National Surgical Quality Improvement Program (ACS-NSQIP) 2012–2016 database was queried for all patients having colorectal resection. Primary outcome was postoperative VTE occurrence within 30 days. A multinomial logistic regression was performed to identify in-hospital and post-discharge predictors of VTE, adjusting for potential confounders.
Out of 260,258 patients, 5381 (2.1%) developed VTE. A total of 3442 (1.3%) were diagnosed during the initial hospital stay and 1929 (0.8%) post-discharge. Risk factors for in-hospital and post-discharge VTE were different as patients with an in-hospital event were more likely to be older, male, known for preoperative steroid use, have poor functional status, significant weight loss, preoperative sepsis, prolonged operative time, undergoing an emergency operation. In the post-discharge setting, steroid use, poor functional status, preoperative sepsis, and postoperative complications remained significant. Postoperative complications were the strongest predictor of in-hospital and post-discharge VTE. Patients with inflammatory bowel disease had a higher risk of VTE than patients with malignancy for both in-patient and post-discharge events.
Patients at high-risk for post-discharge events have different characteristics than those who develop VTE in-hospital. Identifying this specific subset of patients at highest risk for post-discharge VTE may allow for the selective use of prolonged thromboprophylaxis.
KeywordsColorectal surgery Venous thromboembolism Extended prophylaxis Colorectal cancer Inflammatory bowel disease.
Conception and design of study: Alhassan, Trepanier. Acquisition of data: Alhassan, Chaudhury, Lee. Analysis and/or interpretation of data: Alhassan, Trepanier, Sabapathy, Chaudhury, Liberman, Charlebois, Stein, Lee. Drafting of manuscript: Alhassan, Trepanier. Revising the manuscript for critical content: Sabapathy, Chaudhury, Liberman, Charlebois, Stein, Lee. Approval of the final version to be published: Alhassan, Trepanier, Sabapathy, Chaudhury, Liberman, Charlebois, Stein, Lee.
Compliance with ethical standards
Conflict of interest
Dr. Liberman is on the medical advisory committee on ERAS for Merck, and on the advisory committee meeting for Novadaq. Dr. Lee is the recipient of an unrestricted educational grant from Johnson & Johnson. Drs. Alhassan, Trepanier, Sabapathy, Chaudhury, Charlebois, and Stein have no conflicts of interest or financial ties to disclose.
The study protocol was approved by the local institutional review board.
The need for informed consent was waived due to the retrospective nature of the study.
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