What Is Cardiomyopathy?

Plain English

Cardiomyopathy means there is a problem with the heart muscle itself. The heart muscle may become too weak, too thick, too stiff, stretched out, or replaced with scar-like tissue. The heart may have trouble pumping blood forward, relaxing and filling properly, or maintaining a steady rhythm.

Why it matters

Cardiomyopathy can affect how well the heart pumps, fills, and maintains a normal rhythm. It can lead to heart failure, low ejection fraction, irregular rhythms, atrial fibrillation, ventricular arrhythmias, blood clots, stroke risk in some cases, valve problems, or sudden cardiac arrest risk in some types.

Key numbers and tests

Important tests include ejection fraction, echocardiogram, cardiac MRI, EKG, Holter or event monitors, BNP or NT-proBNP, troponin, blood pressure, kidney function, electrolytes, thyroid labs, and genetic testing or family screening when inherited cardiomyopathy is suspected.

Symptoms

Common symptoms include shortness of breath, fatigue, reduced exercise tolerance, swelling, chest discomfort, palpitations, irregular heartbeat, dizziness, fainting, and trouble breathing when lying flat. Urgent symptoms include chest pain, fainting, severe shortness of breath, blue lips, sudden weakness, stroke-like symptoms, sudden collapse, or very fast or irregular heartbeat with severe symptoms.

How it can progress

A person may have inherited risk or risk factors, then early heart muscle changes, abnormal test findings, symptoms, and in advanced disease may develop heart failure, arrhythmias, blood clots, valve problems, or need for devices, procedures, or advanced heart failure care.

Common types

Common types include dilated cardiomyopathy, hypertrophic cardiomyopathy, restrictive cardiomyopathy, arrhythmogenic cardiomyopathy, ischemic cardiomyopathy, nonischemic cardiomyopathy, peripartum cardiomyopathy, and stress-induced cardiomyopathy.

Outlook

Outlook depends on type, cause, ejection fraction, symptoms, rhythm findings, family history, age, kidney function, blood pressure, and response to treatment. Some people remain stable, some improve with treatment, and others may progress and need advanced care.

How diet and exercise help

Reducing sodium when recommended, following fluid guidance if prescribed, choosing heart-healthy foods, limiting ultra-processed foods and alcohol, supporting healthy weight, and personalized safe activity can support heart muscle health alongside medical care.

Metrics to monitor

Home metrics include blood pressure, heart rate, palpitations, shortness of breath, swelling, daily weight, activity tolerance, chest discomfort, dizziness, medication adherence, alcohol intake, and sleep quality. Report-based metrics include ejection fraction, chamber size, wall thickness, valve findings, cardiac MRI findings, EKG, Holter findings, BNP, troponin, kidney function, electrolytes, thyroid labs, genetic testing, blood pressure trends, A1C, and cholesterol.

Common questions

What is cardiomyopathy?

Cardiomyopathy is a disease of the heart muscle that can make the heart enlarged, thickened, stiff, weak, or scarred, which may make it harder for the heart to pump blood effectively.

Is cardiomyopathy the same as heart failure?

No. Cardiomyopathy is a heart muscle disease. It can lead to heart failure in some people, but not everyone with cardiomyopathy has heart failure.

What are the main types of cardiomyopathy?

Common types include dilated, hypertrophic, restrictive, and arrhythmogenic cardiomyopathy. Doctors may also describe it as ischemic or nonischemic depending on the cause.

Is cardiomyopathy genetic?

Some types of cardiomyopathy are genetic. Family screening or genetic counseling may be recommended when inherited cardiomyopathy is suspected.