A standard ECG records the electrical activity of your heart for only a few seconds. By comparison, you wear a Holter monitor for 24 to 48 hours. And unlike an ECG, you do not rest quietly during Holter monitoring. Instead you go about your daily activities while being continuously monitored. You also keep a diary of your activities and any symptoms.
As a result, an abnormality that comes and goes, or occurs only during certain activities or certain times of the day, is more likely to be detected by the Holter monitor.
The most common reasons for getting a Holter monitor test are:
- Unexplained fainting or dizziness
- Palpitations, or a feeling that your heart is fluttering or beating too hard or too fast