<prompt> Which of the following is true about venous thrombosis?It affects only the deep venous systemMost impoant factor for development of deep venous thrombosis is hospital admissionCoralline thrombus is platelet aggregate surrounded by white blood cellsLung infarction is a common complication of deep venous thrombosis  <response>: Answer- B. Most impoant factor for development of deep venous thrombosis is hospital admissionVenous thrombosis is the formation of a semi-solid coagulum within the venous system and may occur in the superficial system.Patients are at risk of dweloping a post-thrombotic limb and venous ulceration Virchow triad-Changes in the wssel wall endothelial damageStasis, which is diminished blood flow through the veinsCoagulability of blood thrombophiliaThe most impoant factor is a hospital admission for the treatment of a medical or surgcal condition.The coralline thrombus then progresses as a propagated loose red fibrin clot, containing many red cells. 