Home use of an ECG machine

An ECG records electrical signals from the heart through sensors placed on the skin. Portable devices may capture a short rhythm strip, sometimes through a watch or handheld contact. Movement, loose contact, sweat and electrical interference can create an unclear tracing or an automated alert that needs review.

A normal-looking home reading does not explain every cause of chest discomfort, breathlessness, dizziness or fainting. Conversely, an abnormal alert may be an artefact or may identify a rhythm that needs assessment. A clinician interprets the tracing alongside your history, examination and, when needed, a clinical electrocardiogram.

Read the device instructions, rest quietly, keep the skin and contacts clean and remain still while recording. Note the time, symptoms, activity and any medicine taken. Save the tracing in its original form so it can be shown to a clinician; do not alter or crop it.

Use the device as an information aid rather than repeatedly checking out of worry. Ask a clinician which readings matter for your condition and how to share them securely. Do not change heart medicines or dismiss symptoms because an app labels a result normal.

Call emergency services for chest pressure or pain, severe breathlessness, fainting, sudden weakness, confusion or a fast or irregular heartbeat with feeling unwell. Do this even if a home ECG appears normal or cannot produce a recording.

Arrange medical review for repeated palpitations, unexplained dizziness, episodes that are becoming more frequent, or a device alert that persists when recorded correctly. Bring the device details and saved tracings to the appointment.

Ask whether this device is suitable for your symptoms, which rhythm changes it can detect, how to confirm an alert, when to record, how to share results and whether you need a formal ECG or other assessment.