What causes venous thromboembolism (VTE)?

Updated: Nov 05, 2020
  • Author: Vera A De Palo, MD, MBA, FCCP; Chief Editor: Vinod K Panchbhavi, MD, FACS  more...
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Answer

Risk factors for thromboembolic disease can be divided into a number of categories, including patient-related factors, disease states, surgical factors, and hematologic disorders. Risk is additive.

Patient-related factors include age older than 40 years, obesity, varicose veins, the use of estrogen in pharmacologic doses (ie, oral contraceptives or hormone replacement therapy), and immobility.

Disease states such as malignancy, congestive heart failure, nephrotic syndrome, recent myocardial infarction, inflammatory bowel disease, spinal cord injury with paralysis, and pelvic, hip, or long-bone fracture confer increased risk of thromboembolic disease.

Surgical factors are related to procedure type and procedure duration. Among patients who have undergone hip surgery, 50% have a proximal DVT on the same side as the hip surgery. This is thought to be due to a twisting of the femoral vein during total hip replacement. The incidence of DVT is higher in patients who have undergone knee surgery. [9]

In a study of patients following pelvic surgery, 40-80% had calf DVT, and 10-20% had thigh vein thromboses. Fatal PE developed in 1-5% of patients. The risk for thromboembolic disease has been shown to be increased with coronary artery bypass grafting (CABG), urologic surgery, and neurosurgery. [12]


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