Recording of every heartbeat over 24-48 hours (longer if needed) using a small pocket-sized device. It is used to capture intermittent palpitations, fainting episodes, and silent rhythm disturbances.
Indication
- Complaints of intermittent palpitations, skipped beats, or irregular pulse
- Investigation of unexplained dizziness, lightheadedness, or fainting (syncope) episodes
- Diagnosis of atrial fibrillation and other rhythm disturbances and assessment of their frequency
- Search for occult atrial fibrillation after a stroke
- Evaluation of device function in patients with a pacemaker or implantable cardioverter-defibrillator (ICD)
- Follow-up of the efficacy and side effects of antiarrhythmic drug therapy
- Evaluation of suspected silent ischemia (asymptomatic reduction in coronary blood flow)
Preparation
- The skin should be clean and free of oil; do not apply cream, lotion, or oil to the chest
- In men, hair on the electrode areas may be shaved to improve electrode adhesion and signal quality
- The device is not water resistant; showering or bathing is not possible while it is worn, so complete bathing beforehand
- Wear loose, front-buttoned clothing so the device cables do not get tangled
- Bring previous ECG, echocardiography, and physician notes with you
How it's performed
- Several small adhesive electrodes are placed on the chest and connected to a pocket-sized recording device
- The device is worn on a belt or shoulder strap; recording starts immediately
- You are asked to continue your daily life (work, walking, sleeping) as usual during the recording period
- You keep a diary, noting the time of any palpitations, dizziness, or chest pain you experience
- When the period ends, the device is returned; the specialist correlates your symptom times with the rhythm tracings
- If 24 hours is not enough, recordings of 48-72 hours, 7 days, or an event recorder may be recommended
Post-procedure
- The physician's report is usually completed within a few days; every beat in the recording is reviewed by computer and specialist
- Based on the findings, medication may be started or adjusted, or further intervention (ablation, pacemaker) may be recommended
- Detailed diary entries during symptom episodes directly increase the value of the report by linking symptoms with rhythm
- If no symptoms occur within 24 hours, longer-duration recording or an implantable loop recorder may be recommended
- Persistent dizziness, chest pain, or fainting during use should prompt immediate medical attention
Risks
- Holter monitoring is considered a painless and risk-free test; it does not deliver electricity, only records
- Rare redness, itching, or mild irritation may occur at the electrode sites
- Cables catching or electrodes coming off can affect recording quality; the test may need to be repeated
- If the device is lost or damaged, the conditions reported by the institution may apply
FAQ
Can I shower or do sports while wearing a Holter?
The device is not water resistant; showering, bathing, and swimming are not possible. Light walking, household activities, and daily routines are fine; vigorous exercise that causes excessive sweating may reduce recording quality.
Is keeping a symptom diary really important?
Yes, very important. Recording the time of symptoms (palpitations, dizziness, fainting) and what you were doing (sleep, climbing stairs, stress, etc.) allows the physician to match the ECG event with your symptom one-to-one. Without a diary, interpretation of rhythm disturbances becomes more difficult.
If nothing was found in 24 hours, is my heart healthy?
No, this is not conclusive. If symptoms do not occur during the recording, a rhythm disturbance may have been missed. In this case, the physician may recommend a 48-72 hour recording, a 7-day patch device, or an implantable loop recorder.
Do mobile phones, microwaves, or magnetic gates affect the device?
Modern Holter devices are resistant to most electronic devices. Still, it is recommended to avoid strong magnetic fields (MRI machines, large generators) and not to place a phone directly on the device. Airport security gates may cause brief interference; note this in your diary.
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