A Holter monitor records heart rhythm over a longer period, helping a clinician investigate symptoms that may not occur during a standard ECG.
The appropriate recording length depends on how often symptoms occur and the question your clinician is trying to answer. A monitor is selected as part of an assessment, not simply because palpitations are present.
New fainting, severe chest pain, marked breathlessness or a sustained rapid heartbeat needs urgent assessment rather than waiting for routine monitoring.
Written & reviewed by
Victoria Medical Clinical Team
GMC-registered physicians and specialist consultants
When rhythm monitoring may be considered
Monitoring may be useful for intermittent palpitations, dizziness, unexplained awareness of heartbeat or follow-up of a known rhythm condition. The clinician considers symptom frequency, medical history and the value of capturing an episode.
| Symptom pattern | Potential monitoring question | Safety note |
|---|---|---|
| Intermittent palpitations | Whether an episode corresponds with a rhythm change | Urgent symptoms need urgent assessment |
| Dizziness or near-fainting | Whether rhythm may be contributory | A routine monitor does not replace emergency review after collapse |
| Known arrhythmia follow-up | Rhythm burden or treatment response | Follow the clinician’s individual plan |
What to expect
Small electrodes are placed on the chest and connected to a recorder. The team explains how to wear the device, whether to keep a symptom diary and when to return the monitor. The exact duration and report timing are confirmed at booking.
Using the result
A recording is interpreted with the symptom diary, ECG and wider clinical context. A result may support reassurance, further testing or a specialist plan; it does not by itself explain every symptom.
What to Expect at Your Appointment
Assessment
Confirm whether monitoring is the right question.
Device fitting
Receive device and diary guidance.
Wear and return
Follow the confirmed recording instructions.
Result pathway
Discuss the report and next step with the appropriate clinician.
Frequently Asked Questions
References
- [1]McDonagh TA et al. 2021 ESC Guidelines for the diagnosis and treatment of acute and chronic heart failure. European Heart Journal. 2021.
- [2]Nagueh SF et al. Recommendations for the Evaluation of Left Ventricular Diastolic Function by Echocardiography. Journal of the American Society of Echocardiography. 2016.
- [3]Hindricks G et al. 2020 ESC Guidelines for the diagnosis and management of atrial fibrillation. European Heart Journal. 2021.
- [4]Jones DW et al. 2025 AHA/ACC Guideline for Prevention, Detection, Evaluation and Management of High Blood Pressure in Adults. Journal of the American College of Cardiology. 2025.
- [5]Whelton PK et al. 2017 ACC/AHA Guideline for the Prevention, Detection, Evaluation, and Management of High Blood Pressure in Adults. Hypertension. 2018.
- [6]Knuuti J et al. 2019 ESC Guidelines for the diagnosis and management of chronic coronary syndromes. European Heart Journal. 2020.
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