Hemachromatosis leads to which cardiomyopathy

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hemochromatosis cardiomyopathy iron

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Hemochromatosis and Cardiomyopathy

Hemochromatosis causes both restrictive and dilated cardiomyopathy, depending on the stage of disease. The key concept is a temporal progression:

Stage 1 - Restrictive Cardiomyopathy (early)

Iron deposits accumulate within cardiomyocytes (intracellular storage), causing myocardial stiffness. This leads to diastolic dysfunction with restrictive hemodynamics and elevated filling pressures. Patients typically present at this stage with exertional dyspnea.

Stage 2 - Dilated Cardiomyopathy (advanced)

With progressive iron loading and myocyte toxicity, the ventricle dilates and systolic (contractile) function declines, producing a dilated cardiomyopathy phenotype with left ventricular systolic dysfunction.

Other Cardiac Manifestations

Conduction defects - heart block
Supraventricular tachyarrhythmias - due to iron deposits in the conduction system
Cardiac involvement is the second leading cause of disease-related death in hereditary hemochromatosis

Key Point for Exams

While the classic answer is restrictive cardiomyopathy (due to iron infiltration within myocytes), advanced/untreated disease progresses to dilated cardiomyopathy. Many sources, including Harrison's (2025), explicitly note: "Hemochromatosis (iron), also with dilated cardiomyopathy phenotype when advanced."

Treatment Response

Importantly, cardiac function - including dyspnea and exercise tolerance - can significantly improve with phlebotomy, especially when initiated before advanced damage occurs.

Sources:

Goldman-Cecil Medicine, Heart Disease in Hemochromatosis chapter
Harrison's Principles of Internal Medicine 22E (2025), Restrictive Cardiomyopathy classification
Yamada's Textbook of Gastroenterology, Cardiac disease in hemochromatosis

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