Atrial septal defect paradoxical emboli

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Paradoxical emboli

Venous thrombi (clots in the veins) are quite common. Embolization (dislodgement of thrombi) normally go to the lung and cause pulmonary emboli. In an individual with ASD, these emboli can potentially enter the arterial system. This can cause any phenomenon that is attributed to acute loss of blood to a portion of the body, including cerebrovascular accident (stroke), infarction of the spleen or intestines, or even a distal extremity (i.e.: finger or toe).

This is known as a paradoxical embolus because the clot material paradoxically enters the arterial system instead of going to the lungs.