Holter monitoring is a non-invasive test used to monitor a person’s heart rhythm over a period of time, usually 24-48 hours. The test involves wearing a small, portable device that records the electrical activity of the heart while the person goes about their daily activities. The data recorded by the Holter monitor is analyzed by a healthcare professional to detect any irregularities or abnormalities in the heart rhythm, which can help diagnose conditions such as arrhythmias, palpitations, and syncope. The test is named after its inventor, Norman Holter, who developed the first portable ECG machine in the 1940s.

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