All increase the chances of Deep Vein Thrombosis except-
Oral contraceptive pills
Hypeension
Superficial thrombophlebitis
Myocardial Infection
Ans. is 'c' i.e., Superficial thrombophlebitis Superficial thrombophlebitis is localized to the superficial veins. It does not result in deep venous thrombosis or pulmonary embolism. o Oral contraceptive pills : Contributes by increasing blood hypercoagulability o Hypeension : Contributes by endothelial injury which results from the hemodynamic stress associated with hypeension. H.T. may precipitate congestive hea failure and hence stasis. o Myocardial infarction : immobilization following myocardial infarction may account for its high incidence in such cases. This contributes by stasis.