It's not clear what causes spontaneous coronary artery dissection (SCAD).

Spontaneous coronary artery dissection (SCAD) causes a superficial tear inside an artery. When the inner layers of the artery separate from the outer layers, blood can pool in the area between the layers. The pressure of the pooling blood can make a short tear much longer. And blood trapped between the layers can form a blood clot.

Spontaneous coronary artery dissection (SCAD) may slow blood flow through the artery to the heart, which makes the heart work harder. Or blood flow through the artery can be completely stopped, causing heart muscle to die (heart attack).

Oct. 09, 2014

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