What should you know about single lead electrocardiogram?

The device uses sensors touching the skin to detect electrical signals during a brief recording. A tracing may show a regular rhythm, an irregular rhythm, or a result that the device cannot classify. A single lead gives less information than a multi-lead clinical ECG, so an alert is a prompt for review rather than a diagnosis. A clinician considers your symptoms, pulse, medical history, medicines and the recording quality. Rhythm conditions such as atrial fibrillation can produce an irregular pattern, while chest discomfort has other possible causes, including angina. The test does not show every heart problem.

Record the date, time, symptoms and activity when you took the reading, and keep the tracing available. Sit still, keep the contact points clean and dry, and follow the device instructions if you repeat it. Do not change heart medicines because of an app message. Arrange a GP Consultation if readings remain irregular, symptoms recur, or the device repeatedly cannot classify the result. A clinician may repeat the test with a standard Electrocardiogram or choose another assessment.

Seek urgent medical help for chest pressure or pain, severe breathlessness, fainting, new weakness on one side, confusion, or a fast or irregular heartbeat with feeling very unwell. These symptoms need assessment even if the single-lead recording appears normal. For milder palpitations that settle, arrange timely clinical advice and bring the recording; the pattern and your symptoms together matter more than a device label.

Ask whether the recording quality is adequate, whether you need a standard ECG or monitoring, and which symptoms should trigger urgent help. You can also ask whether your medicines, thyroid health or known heart conditions could affect the rhythm.