Understanding this service
A Holter monitor is a small, battery-powered ECG device worn outside the body. Adhesive electrodes on the chest record the heartbeat continuously while the patient follows a normal daily routine.
A resting ECG captures only a brief moment, so rhythm problems that come and go may be missed. Holter recordings provide a longer view of heart rate and rhythm and can be compared with a diary of symptoms, sleep, activity and medicines.
When is it recommended?
- Intermittent palpitations or a heartbeat that feels fast, slow or irregular
- Unexplained dizziness, fainting or near-fainting
- Symptoms that were not captured on a standard ECG
- Assessment of known or suspected arrhythmia
- Review of heart-rate control or response to rhythm treatment
Purpose and potential benefits
- Records many hours of heart rhythm during everyday activity and sleep
- Can link symptoms and activities with the rhythm at that time
- May detect intermittent fast, slow or irregular rhythms
- Provides information that can guide further testing or treatment

