{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T23:26:41Z","timestamp":1792193201942,"version":"4.4.0"},"reference-count":57,"publisher":"American Medical Association (AMA)","issue":"11","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JAMA Otolaryngol Head Neck Surg"],"published-print":{"date-parts":[[2022,11,1]]},"abstract":"<jats:sec id=\"ab-ooi220055-4\"><jats:title>Importance<\/jats:title><jats:p>Venous thromboembolism (VTE) is a severe complication after free tissue transfer to the head and neck (H&amp;amp;amp;N). Enoxaparin 30 mg twice daily (BID) is a common regimen for chemoprophylaxis. However, differences in enoxaparin metabolism based on body weight may influence its efficacy and safety profile.<\/jats:p><\/jats:sec><jats:sec id=\"ab-ooi220055-5\"><jats:title>Objective<\/jats:title><jats:p>To assess the association between BMI and postoperative VTE and hematoma rates in patients treated with prophylactic enoxaparin 30 mg BID.<\/jats:p><\/jats:sec><jats:sec id=\"ab-ooi220055-6\"><jats:title>Design, Setting, and Participants<\/jats:title><jats:p>This was a retrospective review of a prospectively collected cohort from 2012 to 2022. Postoperative VTE, hematoma, and free flap pedicle thrombosis were recorded within 30 days of index surgery. The setting was a tertiary academic referral center. Participants included patients undergoing H&amp;amp;amp;N reconstruction with free flaps that received fixed-dose subcutaneous enoxaparin 30 mg BID postoperatively. Statistical analysis was conducted from April to May 2022.<\/jats:p><\/jats:sec><jats:sec id=\"ab-ooi220055-7\"><jats:title>Main Outcomes and Measures<\/jats:title><jats:p>Outcomes include incidence of VTE, hematoma, and flap pedicle thrombosis events within 30 days of the surgery. Univariate and multivariable regression models were used to evaluate associations between BMI and other patient factors with these outcomes.<\/jats:p><\/jats:sec><jats:sec id=\"ab-ooi220055-8\"><jats:title>Results<\/jats:title><jats:p>Among the 765 patients included, 262 (34.24%) were female; mean (SD) age was 60.85 (12.64) years; and mean (SD) BMI was 26.36 (6.29). The rates of VTE and hematoma in the cohort were 3.92% (30 patients) and 5.09% (39 patients), respectively. After adjusting for patient factors, BMI was the only factor associated with VTE (OR, 1.07; 95% CI, 1.015-1.129). Obesity (BMI &amp;amp;gt;30) was associated with increased odds of VTE (OR, 2.782; 95% CI, 1.197-6.564). Hematoma was not associated with BMI (OR, 0.988; 95% CI, 0.937-1.041). Caprini score of at least 9 was not associated with VTE (OR, 1.259; 95% CI, 0.428-3.701).<\/jats:p><\/jats:sec><jats:sec id=\"ab-ooi220055-9\"><jats:title>Conclusions and Relevance<\/jats:title><jats:p>This cohort study found that obesity was associated with an increased risk of VTE in patients after microvascular H&amp;amp;amp;N reconstruction and while on standard postoperative chemoprophylaxis regimens. This association may suggest insufficient VTE prophylaxis in this group and a potential indication for weight-based dosing.<\/jats:p><\/jats:sec>","DOI":"10.1001\/jamaoto.2022.2551","type":"journal-article","created":{"date-parts":[[2022,10,6]],"date-time":"2022-10-06T15:35:07Z","timestamp":1665070507000},"page":"1051","source":"Crossref","is-referenced-by-count":16,"title":["Assessment of BMI and Venous Thromboembolism Rates in Patients on Standard Chemoprophylaxis Regimens After Undergoing Free Tissue Transfer to the Head and Neck"],"prefix":"10.1001","volume":"148","author":[{"given":"Rakan","family":"Saadoun","sequence":"first","affiliation":[{"name":"Department of Plastic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania"},{"name":"Faculty of Medicine Mannheim, Ruprecht Karls University Heidelberg, Mannheim, Germany"},{"name":"Department of Otorhinolaryngology\u2013Head and Neck Surgery, University Medical Centre Mannheim, Mannheim, 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