How does the procedure work?

No large cut is needed to take the tissue samples. Instead, a thin, flexible catheter is guided through a vein, usually in the groin or neck, towards the heart. A tiny pair of forceps at the tip of the catheter removes very small pieces of heart muscle. The procedure takes place in a specialist examination room called a cardiac catheterisation laboratory. It is usually carried out under local anaesthetic, so the area around the insertion point remains pain-free. During the procedure, the heartbeat and circulation are monitored continuously.

The whole thing usually takes only a few minutes. The samples that are taken are then examined in the laboratory under a microscope and with special stains, to make diseased changes, inflammation, or deposits visible.

What are the risks?

As with any medical procedure, there are certain risks with a myocardial biopsy. The most common include minor bruising at the insertion site or mild heart rhythm disturbances during the procedure. Very rarely, more significant bleeding, injury to the heart, or inflammation can occur. In specialist centres and with experienced doctors, the risk of serious complications is extremely low. After the examination, a short period of monitoring is usually needed before leaving the clinic.

Why is this examination sometimes necessary?

Sometimes a disease of the heart muscle can only be confirmed with certainty by examining the tissue directly. For example, viruses, bacteria, or immune cells in the heart muscle can trigger inflammation that is not always clearly visible in blood tests or imaging methods. In certain rare conditions where proteins or other substances build up in the heart, the biopsy also provides important information that is crucial for further treatment.

After a heart transplant, the myocardial biopsy is used to detect possible rejection early, before symptoms appear. This means that targeted treatment can be started in good time.

What happens after a myocardial biopsy?

After the procedure, there is usually a short observation period. During this time, checks are made to ensure there is no further bleeding and that the heart continues to beat steadily. The results of the tissue examination are usually available after a few days. They determine whether further treatment is needed, and if so, what kind. In many cases, the myocardial biopsy brings clarity about the cause of the symptoms and makes targeted treatment possible.

The idea of a piece of heart muscle being removed may feel worrying at first. However, the sample taken is very small and has no effect on how the heart works. The examination is only recommended when it is truly necessary and other methods are not enough to establish a diagnosis with certainty.

A myocardial biopsy is therefore a specialist procedure that is used in a targeted way when the precise investigation of heart muscle diseases is needed. The information gained is often crucial for the right treatment and can help to prevent serious complications.