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Restrictive cardiomyopathy (RCM) is a form of cardiomyopathy in which the walls are rigid,[1] and the heart is restricted from stretching and filling with blood properly.
It is the least common cardiomyopathy.[citation needed]
Rhythmicity and contractility of the heart may be normal, but the stiff walls of the heart chambers (atria and ventricles) keep them from adequately filling, reducing preload and end-diastolic volume.
So blood flow is reduced, and blood that would normally enter the heart is backed up in the circulatory system. In time, restrictive cardiomyopathy patients develop diastolic dysfunction and eventually heart failure.
It is possible to divide the causes into primary and secondary.[2]
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