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What Are the Risks of Using a Holter or Event Monitor?

The sticky patches used to attach the sensors (electrodes) to your chest have a small risk of skin irritation. You also may have an allergic reaction to the paste or gel that's sometimes used to attach the patches. The irritation will go away once the patches are removed.

If you're using an implantable loop recorder, you may get an infection or have pain where the device is placed under the skin. Your doctor can prescribe medicine to treat these problems.

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Clinical Trials

Clinical trials are research studies that explore whether a medical strategy, treatment, or device is safe and effective for humans.

March 16, 2012 Last Updated Icon

The NHLBI updates Health Topics articles on a biennial cycle based on a thorough review of research findings and new literature. The articles also are updated as needed if important new research is published. The date on each Health Topics article reflects when the content was originally posted or last revised.