Notice: Users may be experiencing issues with displaying some pages on stanfordhealthcare.org. We are working closely with our technical teams to resolve the issue as quickly as possible. Thank you for your patience.
Venous blood clots may be the result of the following:
Disease or injury to the veins in the legs
Immobility for any reason
Inherited disorders or inherited predisposition
Autoimmune disorders that predispose to clotting
Pooling (stasis) of blood in the legs and subsequent clotting can result in varicose veins. Clots in the legs may break loose and travel to the lungs, causing pulmonary clots that can result in respiratory distress, pain, and in extreme cases, death.
Arterial blood clots may be the result of arteriosclerosis (hardening of the arteries where fatty or calcium deposits cause the arterial walls to thicken) of blood vessels (clots tend to form on abnormal blood vessel surfaces).
When arterial blood clots occurs in the coronary arteries (the two that come from the aorta to provide blood to the heart muscle), it can lead to heart attacks. When arterial blood clots occurs in the cerebral (brain) circulation, it can lead to strokes or lack of oxygen to other organs.
Open trials refer to studies currently recruiting participants or that may recruit participants in the near future. Closed trials are not currently enrolling, but similar studies may open in the future.
Closed trials are not currently enrolling, but may open in the future.