What should you know about an electrocardiogram monitor?

A standard ECG captures a brief snapshot through electrodes placed on the skin. A portable or ambulatory monitor can record for longer, which may help match an intermittent flutter, racing sensation or skipped beat with the heart rhythm at that moment. The tracing is interpreted alongside your symptoms, medical history and medicines; a monitor alone does not name every possible cause.

The equipment may be a small recorder worn on the body or a bedside device. Keep the electrodes attached as instructed and write down symptoms, activity and their timing if you are asked to do so.

Wear comfortable clothing that allows access to the chest. Tell the clinician about skin sensitivity, implanted heart devices and medicines. Follow instructions about bathing, exercise and returning the recorder. Do not remove leads simply because the tracing looks unusual to you; contact the service if an electrode loosens or the device alarms.

Seek emergency help for chest pressure or pain that is severe, new or persistent, especially with breathlessness, fainting, cold sweat or marked weakness. A monitor should not delay urgent assessment. Arrange medical review for repeated palpitations, dizziness or fainting, even if a recording later appears normal.

Ask which type of monitor you will use, how long to wear it, which activities are allowed, and when and how the result will be explained.