A brief ECG can show how your heart is beating at one particular moment.
But what happens when an irregular heartbeat occurs only occasionally, perhaps while you are sleeping, working or going about your daily routine?
This is where longer heart monitoring can help.
24-hour ECG monitoring records your heart’s electrical activity over an extended period, allowing doctors to investigate rhythm changes that may not appear during a standard ECG.
Key Takeaways
- A 24 or 48-hour heart monitor records your heart’s electrical activity continuously during everyday activities.
- It can help identify intermittent abnormal heart rhythms that a standard ECG might not capture.
- Recording symptoms alongside heart activity helps doctors understand whether the two are connected.
- The monitoring period depends on how frequently symptoms occur and what needs to be investigated.
Why Might a Normal ECG Not Tell the Whole Story?
A standard ECG typically records your heart’s electrical activity for a short period. While useful, it provides only a snapshot of your heart rhythm.
Some heart rhythm disturbances, known as arrhythmias, occur intermittently. Your heartbeat might appear completely normal during an appointment but become irregular several hours later.
A doctor may recommend longer monitoring if you experience,
- Occasional heart palpitations or a racing heartbeat.
- Episodes of dizziness or light-headedness.
- Unexplained fainting or near-fainting.
- Intermittent episodes of an unusually slow or fast heartbeat.
These symptoms can have several possible explanations. Monitoring helps establish whether an abnormal heart rhythm is occurring when symptoms develop.
What Can 24-Hour or 48-Hour Heart Monitoring Reveal?
A Holter monitor is a portable device that records the heart’s electrical activity continuously, usually through small electrodes attached to the chest. Depending on the device and monitoring period, it can help identify,
- Irregular heart rhythms- It may detect arrhythmias such as atrial fibrillation, where the upper chambers of the heart beat irregularly, or other rhythm disturbances.
- Episodes of unusually fast or slow heart rates- The recording can show periods when the heart beats faster or slower than expected, including changes during sleep or physical activity.
- Pauses or abnormal electrical activity- Doctors can examine whether there are unusual pauses between heartbeats or other electrical patterns that may require further assessment.
- The relationship between symptoms and heart rhythm- This is particularly useful. If you experience palpitations or dizziness while wearing the monitor, recording the time can help the doctor compare your symptoms with the heart’s electrical activity.
Is There a Difference Between 24 and 48-Hour Monitoring?
The main difference is how long your heart activity is recorded.
- 24-hour monitoring- Records heart rhythms over one full day and night. It may be suitable when symptoms occur relatively frequently.
- 48-hour monitoring- Provides an additional day of recording, increasing the opportunity to capture intermittent rhythm changes.
However, longer monitoring does not automatically mean a more useful result. If symptoms occur only once every few weeks, a longer-term event monitor or another type of ambulatory ECG monitoring may be considered instead.
The appropriate device and monitoring duration depend on your symptoms and medical history.
What Should You Expect While Wearing the Monitor?
Most people can continue their usual daily activities while wearing a Holter monitor. A few practical considerations can help,
- Keep the electrodes and recording device properly attached.
- Follow the clinic’s instructions regarding bathing, showering and keeping the equipment dry.
- Record the time of any symptoms, such as palpitations, dizziness or chest discomfort.
- Make a note of relevant activities, including exercise and sleep.
Once the monitoring period is complete, the device is returned so that the recorded information can be analysed.
A normal result does not necessarily rule out an intermittent rhythm problem, particularly if no symptoms occurred during the recording period.
Frequently Asked Questions
Is wearing a Holter monitor painful?
No. The device is non-invasive. You may experience minor skin irritation from the adhesive electrodes, but the recording itself does not cause pain.
Can I sleep normally while wearing a heart monitor?
Yes. You can generally follow your usual sleeping routine. However, take care not to pull on the wires or dislodge the electrodes.
Can a 24-hour ECG detect atrial fibrillation?
It can detect episodes of atrial fibrillation if they occur during the recording period. However, an episode that happens outside this period may not be captured.
Does a normal Holter monitor result mean my heart is healthy?
Not necessarily. It means that no significant abnormality was identified in the recorded period. Other investigations may be needed depending on your symptoms and medical history.
Will I receive my results immediately after removing the monitor?
Usually not. The recorded data needs to be downloaded and analysed before the doctor can interpret the findings and explain their significance.
Schedule a Consultation to Better Understand Your Heart Rhythm!
An occasional racing heartbeat or unexplained episode of dizziness can be difficult to investigate when symptoms are not present during a clinic visit. Longer heart rhythm monitoring provides additional information about how your heart behaves throughout the day and night.
At Forte Cardiology Clinic, Dr. Yong Thon Hon can assess your symptoms and medical history to determine whether 24-hour or longer-term ECG monitoring may be appropriate.
If you have concerns about intermittent palpitations, dizziness or changes in your heartbeat, consider discussing them with Dr. Yong Thon Hon to understand the available assessment options.
