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A Holter monitor is a small wearable device that records the heart's electrical activity during daily life. It works like a longer version of an electrocardiogram, or ECG. Most Holter monitors are worn for 24 to 48 hours, though some monitoring plans last longer. The recording helps clinicians look for irregular heart rhythms that might not appear during a short office test.
read more about holter monitor ...Sticky electrodes are placed on the chest and connected to a small recorder. The monitor collects heart rhythm data while you walk, sleep, work, and do normal activities. Some models use fewer wires or a patch design. After the monitoring period, the device is returned or uploaded so the care team can review the recording.
A clinician might order a Holter monitor for palpitations, dizziness, fainting, chest fluttering, or suspected rhythm changes. It can also check how well heart rhythm treatment is working. The device gives a longer look at your heartbeat than a standard ECG. Symptom notes can help match what you felt with what the monitor recorded.
Follow the instructions for bathing, exercise, sleeping, and device care. Some monitors should not get wet, while other designs have different rules. Keep a symptom diary if your care team asks for one, including the time and what you were doing. Avoid removing electrodes unless you were told how to replace them safely.
After the monitoring period, the recorded data is reviewed for rhythm changes, heart rate patterns, pauses, or skipped beats. Results are compared with your symptoms and medical history. A normal result does not always rule out occasional rhythm problems, especially if symptoms did not happen during the test. Your clinician can recommend follow-up testing or treatment if needed.
No. Wearing the device should not hurt, though the adhesive patches can irritate some skin. Tell your care team if you have sensitive skin or a known adhesive allergy.
Only shower if your care team says your specific monitor can get wet. Some devices must stay dry for the full monitoring period.
Write down symptoms such as palpitations, dizziness, shortness of breath, chest discomfort, or faintness. Include the time, activity, and how long the symptom lasted.
Follow the instructions you were given for reattaching or replacing electrodes. If you are not sure what to do, contact the clinic or testing center.
Holter Monitor. Mayo Clinic. https://www.mayoclinic.org/tests-procedures/holter-monitor/about/pac-20385039. Date Accessed May 26, 2026.
Holter Monitor. Johns Hopkins Medicine. https://www.hopkinsmedicine.org/health/treatment-tests-and-therapies/holter-monitor. Date Accessed May 26, 2026.
Holter Monitor (24h). MedlinePlus Medical Encyclopedia. https://medlineplus.gov/ency/article/003877.htm. Date Accessed May 26, 2026.
Holter Monitor. American Heart Association. https://www.heart.org/en/health-topics/arrhythmia/symptoms-diagnosis--monitoring-of-arrhythmia/holter-monitor. Date Accessed May 26, 2026.
Ambulatory ECG Monitoring. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK597374/. Date Accessed May 26, 2026.