Several: Constrictive pericarditis is a condition where the sac around the heart (the pericardium) becomes scarred and shrinks, which does not allow the heart to fill fully. Restrictive cardiomyopathy is a condition where the pericardium is normal, but the heart muscle itself is diseased in a way that does not allow the muscle to relax and the ventricle to fill. The treatment for each is different.
Answered 9/8/2016
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