Connection: This is a genetic abnormality that allows an artery to feed directly into a vein (instead of gradually perfusing tissue before being returned to the venous capillaries). This direct A-V communication creates what is called a shunt, and if large enough may cause volume overload on the heart, which may lead to hear chamber enlargement and even failure. At the site of the AVM, bleeding may result.
Answered 12/17/2014
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