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Event monitors are similar to Holter monitors, but they do not record the heart rhythm continuously. Event monitors record the heart rhythm only when an abnormally fast or slow heart beat occurs or when you activate them. They typically are used for one or two months during which patients are instructed to trigger the device and record their symptoms if symptoms occur. Once a recording is obtained, the ECG tracing can be transmitted over the phone to a monitoring station which will analyze the ECG recording and send it to your arrhythmia specialist for interpretation.