What does an electrocardiogram treat?

An ECG uses sensors placed on the skin to capture the timing and pattern of each heartbeat. It may help identify an irregular rhythm, signs that the heart muscle is under strain, or changes that need further assessment. It can support evaluation of symptoms such as chest discomfort, palpitations, breathlessness, dizziness, or fainting. A normal recording does not explain every symptom, particularly when an intermittent rhythm problem is not happening during the test. A clinician interprets the tracing alongside your history and examination.

If an ECG suggests a rhythm or heart problem, a clinician may arrange repeat monitoring, blood tests, imaging, or specialist review. Treatment depends on the underlying finding, not on the ECG itself. An ECG may form part of assessment for angina, atrial fibrillation, heart attack, or heart failure. Wear loose clothing when attending and tell the team about symptoms, medicines, and previous heart diagnoses. The recording is quick and usually involves remaining still while the sensors are attached.

Call emergency services for sudden chest pressure or pain, severe breathlessness, collapse, new weakness on one side, or a fast or irregular heartbeat with fainting. Do not wait for a routine ECG appointment when symptoms are severe, sudden, or worsening. While waiting for help, rest and follow the emergency operator's instructions.

Ask why the ECG was recommended, whether you need a resting or longer recording, what the result means for your symptoms, and which warning signs should lead you to seek urgent help. Ask when and how you will receive the interpretation.