Understanding the technology
About This Technology.
The Holter Monitoring System is a small ECG recorder that you wear during your normal daily activities, usually for 24 to 48 hours. It records every heartbeat without a break, so your doctor can look for rhythm problems (arrhythmias) that come and go, match them with symptoms such as palpitations or dizziness, and check how well treatment is working.
What Is a Holter Monitor?
A standard ECG records the electrical activity of the heart for a few seconds while you lie down. Many heart rhythm problems come and go, so they are not captured in such a short time. A Holter monitor is a small, lightweight ECG recorder connected to several electrodes on your chest. It records every heartbeat while you go about your usual activities, usually for 24 to 48 hours, or longer if your doctor needs it.
When a Holter Monitor Is Needed
- Finding the cause of palpitations, skipped beats, dizziness, or near fainting that occur almost every day.
- Looking for atrial fibrillation, an irregular rhythm that increases the risk of stroke.
- Counting extra beats (ectopic beats) and assessing a heart rate that is too slow or too fast.
- Checking the effect of rhythm medicines, ablation, or how a pacemaker is working.
Wearing a Holter Monitor in Daily Life
Fitting the monitor is painless. The skin on your chest is cleaned, and hair may be shaved where the electrodes go. The electrodes are then attached and connected to a recorder that you carry on a belt or strap. You then go home and carry on as usual, including working and sleeping.
During the recording, note the time and type of any symptoms, your activities, and when you take medicines in a diary, or press the event button on the device if it has one. Keep the device dry, for example when bathing or swimming, unless the staff tell you otherwise. When the recording period ends, you return to have the device removed.
Limitations of the Test
A Holter monitor only records while it is worn. If your symptoms are rare, for example once a month, the chance of capturing them is small. In that case, your doctor may choose a longer recording or an implantable loop recorder (ILR), a small recorder placed under the skin. A normal result also does not always mean the heart is free of problems, because a Holter monitor assesses rhythm, not the structure of the heart or the coronary arteries. The electrode patches sometimes cause mild skin irritation.
Analysis and Results
Your doctor decides whether a Holter monitor suits your symptoms and how long the recording should last. The recording is analyzed with software, then checked and interpreted by a cardiologist together with your symptom diary. The results are explained during your consultation.
Clinical use
Uses and Benefits.
Whether this technology suits your condition is decided by a doctor after an evaluation.
- Finding the cause of frequent palpitations, dizziness, or near fainting
- Detecting atrial fibrillation and other rhythm problems that come and go
- Counting the number of extra beats (ectopic beats) over a day
- Assessing a heart rate that is too slow, including pauses between beats
- Matching recorded symptoms with the heart rhythm at the same moment
- Checking the effect of rhythm medicines or ablation
- Checking how a pacemaker works in everyday life
Benefits for the Doctor's Assessment
Recording Every Beat in Everyday Life
Your heart rhythm is recorded without a break while you work, go about your day, and sleep, not just for a few seconds in the clinic.
Symptoms Matched with the Recording
A diary or event button marks when symptoms occur, so your doctor can see whether they happen at the same time as a rhythm problem.
No Needles and No Radiation
The electrodes are simply attached to the skin of your chest. The test does not use X-rays, contrast, or medicines.
Counting How Often and How Long Arrhythmias Occur
Analysis software adds up extra beats and the length of each arrhythmia episode. This information helps your doctor weigh whether treatment or ablation is needed.
Brief Technical Information
- Type of examination
- Ambulatory ECG recording (an ECG you wear during daily activities)
- Recording period
- Usually 24 to 48 hours or longer, as requested by your doctor
- Data source
- Electrical signals of the heart from electrodes on the chest
- Radiation
- None
- Sedation
- Not required
- Service location
- Cardiovascular Diagnostic Center and Arrhythmia and Device Center
