What is a Holter monitor?

A Holter monitor is a portable EKG: a small recorder connected to chest electrodes that you wear continuously for 24 to 48 hours - sometimes up to two weeks - recording every heartbeat while you live normally. NHLBI describes it among the standard heart-rhythm tests, and its purpose is exactly the gap office EKGs leave: palpitations, flutters, racing episodes, dizzy spells, and fainting that happen unpredictably and are never present during a ten-second clinic tracing. You keep a symptom diary - the time and what you felt - and the cardiologist matches your diary entries against the recording, which is the moment of diagnosis: this sensation was that rhythm. Practical notes: no showering while wearing it - sponge baths - keep phones and magnets at a small distance, and do your normal activities, including exercise, because capturing symptoms is the whole point. Longer-capture cousins exist when Holter comes up empty: event recorders worn for weeks that you activate during symptoms, and patch monitors worn one to two weeks. What it catches: AFib episodes, abnormally fast or slow rhythms, pauses, and runs of extra beats - and reassurance when your flutter turns out to be benign extra beats, which is the most common outcome. Fainting with chest pain or a racing heart that will not stop does not wait for a monitor appointment - that is urgent-care territory. Pymander is a free AI doctor, 24/7 by text. Describe your episodes, and it can help you prepare for the monitoring conversation.