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What is restrictive cardiomyopathy (RCM)?

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What is restrictive cardiomyopathy (RCM)?

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Restrictive cardiomyopathy (RCM) refers to a group of disorders in which the heart chambers are unable to fill properly with blood because of stiffness of the heart muscle. It presents in the same way as HCM, except that the ventricle becomes smaller not due to thickening of the walls, but due to fibrosis (scarring) of the heart muscle. The heart cannot relax normally in diastole (the time between heartbeats). Usually cats with RCM have a dramatically enlarged right atrium and are in congestive heart failure when diagnosed. Unfortunately, RCM is the least understood of the feline cardiomyopathies and the prognosis for cats with RCM is poorer than for those with HCM.

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