Heart Biopsy (Endomyocardial Biopsy): Procedure, Risks and Results
Updated: 2 days ago
Written and medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: November 2026 · How we review
Quick Answer
A heart biopsy, also called an endomyocardial or cardiac biopsy, removes tiny pieces of tissue from the inner lining of the heart muscle for examination under a microscope. It's used to check for rejection after a heart transplant and to diagnose conditions such as myocarditis and cardiomyopathy. Serious complications occur in fewer than 1% of cases.
What the research says
Serious complications are rare: in 3,048 heart biopsies over 11 years, there were no deaths, and major complications occurred in 0.12% of earlier procedures and none of the later, carefully tracked ones (Holzmann M et al., Circulation, 2008) [2]
Sampling both sides can help diagnosis: in 755 people, major complications occurred in 0.64% of left-sided and 0.82% of right-sided biopsies, and biopsy of both heart chambers gave a diagnosis more often (79.3% vs. 67.3%) (Yilmaz A et al., Circulation, 2010) [3]
Key takeaways
A heart biopsy takes tiny samples of heart muscle through a catheter.
It's used to check transplant rejection and diagnose heart muscle diseases.
You're awake with a sedative and local anesthetic.
The procedure takes about an hour.
Serious complications happen in fewer than 1% of cases.
What is a heart biopsy?
Some heart muscle diseases look similar on imaging tests such as an echocardiogram or cardiac MRI, and only a tissue sample can show the exact cause. A pathologist examines the samples for inflammation, scarring, abnormal protein deposits or signs of rejection. The procedure is similar to cardiac catheterization. Sources: [1]
Why it's done
A biopsy can pinpoint the cause of heart muscle disease.
Checking for rejection after a heart transplant, often weekly at first, then every 6 weeks to 3 months for at least a year.
Diagnosing myocarditis, cardiomyopathy, including hypertrophic cardiomyopathy, and unexplained heart failure.
Diagnosing ATTR amyloidosis or sarcoidosis.
Checking heart damage from chemotherapy.
Evaluating heart tumors. Sources: [1]
How to prepare
Give your provider a current list of medicines and supplements.
You may need to stop blood thinners beforehand.
You may need to fast for a set time.
Arrange for someone to drive you home. Sources: [1]
What happens during the procedure
The procedure takes about an hour.
You receive a sedative to relax and a local anesthetic at the insertion site, usually in the neck or groin.
A catheter is threaded through a blood vessel to the heart, guided by fluoroscopy (X-ray) or an echocardiogram.
A bioptome snips several tiny tissue samples.
The catheter is removed and a pressure bandage is applied. Sources: [1]
You may feel pressure or slight discomfort but shouldn't feel pain. Sources: [1]
Risks
Your care team monitors you closely afterward.
Type | Examples | How often |
Minor | Bruising or bleeding at the insertion site | Fewer than 6% |
Serious | Irregular heartbeat, blood clots, vessel damage, collapsed lung, fluid around the heart, tricuspid valve leak, infection | Fewer than 1% |
People with conditions such as heart valve disease may face a higher risk. Sources: [1, 2, 3]
Recovery and results
You're monitored for a few hours, often with a chest X-ray to check for a collapsed lung or bleeding. Avoid heavy lifting and strenuous activity for 24 hours; most people return to work the next day. Results can be ready in 24 to 48 hours. Call your provider or get help for dizziness, an irregular pulse, shortness of breath, fever, chills or signs of a heart attack or stroke. Sources: [1]
Conclusion
A heart biopsy gives a direct look at your heart muscle cells. It's the most reliable way to detect transplant rejection and to pinpoint certain heart muscle diseases, so your care team can choose the right treatment.
Keep learning: read about cardiac amyloidosis and cardiac catheterization.
Frequently asked questions
What is a heart biopsy?
A procedure that takes tiny samples of heart muscle for testing.
Why is a heart biopsy done?
To check transplant rejection and diagnose heart muscle diseases.
Will I be awake?
Yes, with a sedative and local anesthetic.
Does it hurt?
You may feel pressure but shouldn't feel pain.
How long does it take?
About an hour.
What is a bioptome?
A small tweezer-like tool that snips heart tissue samples.
What are the risks?
Bruising is most common; serious problems occur in fewer than 1%.
How long is recovery?
Most people return to normal activities the next day.
When will I get results?
Often within 24 to 48 hours.
How often do transplant patients need biopsies?
Often weekly at first, then every 6 weeks to 3 months for at least a year.
Related Reading
Cardiac PYP Scan: Testing for ATTR Cardiac Amyloidosis explains the nuclear scan used to diagnose ATTR cardiac amyloidosis.
What Is Cardiac Amyloidosis? Symptoms, Causes, Diagnosis and Treatment a heart condition a biopsy can diagnose.
Cardiac Catheterization (Heart Cath): Why It's Done, Procedure, Risks and Recovery a similar catheter-based heart procedure.
Heart MRI (Cardiac MRI): What It Shows, How to Prepare, What Happens and Results an imaging test of the heart muscle.
Echocardiogram: Types, What to Expect, Results and Risks ultrasound of the heart.
Heart Failure: Symptoms, Causes & Treatment Guide a condition that may need a biopsy to find the cause.
References
Cleveland Clinic. Heart Biopsy (Cardiac Biopsy): Procedure Details, Results and Recovery. Cleveland Clinic. Last updated May 20, 2022. https://my.clevelandclinic.org/health/diagnostics/17255-myocardial-biopsy
Holzmann M, Nicko A, Kühl U, et al. Complication rate of right ventricular endomyocardial biopsy via the femoral approach: a retrospective and prospective study analyzing 3048 diagnostic procedures over an 11-year period. Circulation. 2008;118(17):1722-1728. PMID 18838566. https://doi.org/10.1161/CIRCULATIONAHA.107.743427
Yilmaz A, Kindermann I, Kindermann M, et al. Comparative evaluation of left and right ventricular endomyocardial biopsy: differences in complication rate and diagnostic performance. Circulation. 2010;122(9):900-909. PMID 20713901. https://doi.org/10.1161/CIRCULATIONAHA.109.924167
Medical disclaimer
This article is for general education only and does not replace advice from a qualified healthcare professional. Talk to your doctor about your own diagnosis and treatment, and seek emergency care right away for severe or sudden symptoms.
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