Summary
There have been no comprehensive studies that have compared the incidence of symptomatic
VTE over a spectrum of different urgent or elective surgical procedures. In this study
we determined the incidence of symptomatic venous thromboembolic events (VTE) within
a 3 month period after 76 different surgical procedures. Using a large administrative
data-base, we analyzed 1,653,275 cases that underwent one of 76 selected surgical
procedures between January 1, 1992 and September 30, 1996. The principal outcomes
were venous thrombosis or pulmonary embolism, during either the initial hospitalization
or a re-hospitalization for VTE within 91 days of the date of surgery. Predictors
of VTE were analyzed using logistic regression. Overall, VTE was diagnosed in 13,533
cases (0.8%, 95% CI = 0.7-0.9%) and of these, 5049 (37%, 95% CI = 36-38%) had pulmonary
embolism. Predictors of VTE included: advancing age (OR=1.1 per 5 year increment in
age, 95% CI =1.1-1.1), Latino ethnicity (OR = 0.9, 95% CI =0.8-0.9), Asian/Pacific
Islander ethnicity (OR = 0.5, 95% CI = 0.4-0.6), presence of a malignancy (OR = 1.7,
95% CI = 1.6-1.8) and prior VTE (OR = 6.2, 95% CI = 5.5-7.0). High-risk procedures
that had an incidence of symptomatic VTE of approximately 2 to 3% included invasive
neurosurgery, total hip arthroplasty, major vascular surgery and radical cystectomy.
Fifty-six percent of all VTE events diagnosed within 91 days of surgery occurred after
discharge. The findings of this study provide a basis for categorizing different surgical
procedures as low, intermediate, high and very high risk for VTE. Because of the high
incidence of VTE diagnosed after hospital discharge, further studies of extended thromboprophylaxis
appear warranted.
Keywords
Thromboembolism - surgery - complications - venous thrombosis - epidemiology