Which of the following are risk factors for deep venous thrombosis? 1. Duration of surgery more than 30 minutes 2. Prior history of venous thrombosis 3. Age less than forty years 4. Obesity Select the correct answer using the codes given below: Codes:

A.   1, 2 and 3  B. 1, 2 and 4  C. 2, 3 and 4  D. 1, 3 and 4

 

        Ans. B  (Kumar and Clark 4th ed., p 409, 742; Harrison 16th ed., p 1491): The various risk factors for DVT are old age,obesity, immobility, pregnancy and puerperium, trauma or surgery (especially of pelvis, hip or legs), malignancy, prior history of venous thrombosis, OCP, malignancy, infection etc.