The Holter monitor is a type of portable electrocardiogram (ECG). It records the electrical activity of the heart continuously over 24 hours or longer while you are away from the diagnostic centre.
You may require a Holter monitor ECG if you have symptoms, such as dizziness, fainting, low blood pressure, fatigue, and palpitations and a resting ECG doesn’t show a clear cause. You wear the same kind of ECG electrode patches on your chest, and the electrodes are connected by wires to a small portable recording device.
Certain arrhythmias (abnormal heart rhythms) may occur only now and then. Or, they may occur only under certain conditions, such as stress or activity. Arrhythmias of this type are hard to record on a resting ECG. Because of this, you may be asked to undergo Holter monitoring to get a better chance of capturing any abnormal heartbeats or rhythms that may be causing the symptoms.
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