BACKGROUND: There is evidence demonstrating an association between infection and venous thromboembolism. We recently identified this association in the postoperative setting; however, the temporal relationship between infection and venous thromboembolism is not well defined
OBJECTIVE: We sought to determine the temporal relationship between venous thromboembolism and postoperative infectious complications in patients undergoing colorectal surgery.
DESIGN, SETTING, AND PATIENTS: A retrospective cohort analysis was performed using data for patients undergoing colorectal surgery in the National Surgical Quality Improvement Project 2010 database.
MAIN OUTCOME MEASURES: The primary outcome measures were the rate and timing of venous thromboembolism and postoperative infection among patients undergoing colorectal surgery during 30 postoperative days.
RESULTS: Of 39,831 patients who underwent colorectal surgery, the overall rate of venous thromboembolism was 2.4% (n = 948); 729 (1.8%) patients were diagnosed with deep vein thrombosis, and 307 (0.77%) patients were diagnosed with pulmonary embolism. Eighty-eight (0.22%) patients were reported as developing both deep vein thrombosis and pulmonary embolism. Following colorectal surgery, the development of a urinary tract infection, pneumonia, organ space surgical site infection, or deep surgical site infection was associated with a significantly increased risk for venous thromboembolism. The majority (52%–85%) of venous thromboembolisms in this population occurred the same day or a median of 3.5 to 8 days following the diagnosis of infection. The approximate relative risk for developing any venous thromboembolism increased each day following the development of each type of infection (range, 0.40%–1.0%) in comparison with patients not developing an infection.
LIMITATIONS: We are unable to account for differences in data collection, prophylaxis, and venous thromboembolism surveillance between hospitals in the database. Additionally, there is limited patient follow-up.
CONCLUSIONS: These findings of a temporal association between infection and venous thromboembolism suggest a potential early indicator for using certain postoperative infectious complications as clinical warning signs that a patient is more likely to develop venous thromboembolism. Further studies into best practices for prevention are warranted.
1Department of Urology, Indiana University School of Medicine, Indianapolis, Indiana
2Department of Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland
3Center for Surgical Trials and Outcomes Research, Johns Hopkins Medical Institutions, Baltimore, Maryland
4Armstrong Institute for Patient Safety and Quality Care, Johns Hopkins Medical Institutions, Baltimore, Maryland
5Department of Medicine, Division of Hematology, Johns Hopkins Medical Institutions, Baltimore, Maryland
Financial Disclosure: None reported.
Correspondence: Susan L. Gearhart, M.D., Associate Professor of Surgery, Colorectal and Oncology Blalock 658, Department of Surgery, 600 North Wolfe St, Baltimore, MD 21287. E-mail: firstname.lastname@example.org