When is electrocardiogram recommended for atrial fibrillation?

An ECG captures the heart's electrical pattern through skin stickers. It can identify an irregular rhythm and help distinguish atrial fibrillation from other rhythm problems. Atrial fibrillation may cause a racing or fluttering heartbeat, tiredness, breathlessness, dizziness, or no noticeable symptoms. See [Atrial Fibrillation](/conditions/atrial-fibrillation/).

A short ECG can miss episodes that come and go. If the rhythm is normal during the appointment but symptoms recur, a clinician may discuss longer monitoring.

Record when palpitations begin, how long they last, and whether they follow exertion, poor sleep, illness, or stimulants. Tell the clinician about fainting, chest discomfort, breathlessness, previous rhythm problems, and every medicine or supplement you take.

The [Electrocardiogram](/treatments/diagnostics-and-screening/ecg/) test is quick and does not involve needles or electric shocks. Follow-up may include checking pulse, blood pressure, and factors that influence treatment decisions.

Seek emergency help for a fast or irregular heartbeat with chest pain, severe breathlessness, fainting, confusion, or new weakness or numbness on one side. Do not wait for a routine ECG when these symptoms are present.

Ask whether a standard ECG is enough, whether longer rhythm monitoring is needed, and what symptoms should trigger urgent review. Ask how the result affects decisions about controlling the rhythm, heart rate, or stroke risk.