An ECG Holter is a medical device used to monitor the electrical activity of the heart over an extended period, usually 24 to 48 hours, or even longer. It is used to diagnose rhythm abnormalities or cardiac conduction disorders.

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The holter device is usually worn by the patient in normal daily life. It consists of a small, portable electronic box that continuously records the heart's electrical activity using electrodes attached to the patient's chest. The recorded data are then analyzed by a physician to detect any abnormalities in the patient's heart rhythm.

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This technology is invaluable in detecting intermittent cardiac arrhythmias, or those that occur during normal daily activities and might not be detected by a standard electrocardiogram (ECG).

If an electrode becomes detached, don't worry, the trace can still be analyzed.