What should you know about a paramedic ECG machine?

An ECG uses adhesive electrodes on the skin to detect electrical signals from the heart. The machine displays and stores these signals as a tracing, showing rate, rhythm and the timing of electrical activation. Paramedics may perform it when someone has chest discomfort, palpitations, fainting, breathlessness or an unexplained change in condition. The tracing is one part of an assessment and is interpreted alongside symptoms, examination findings and medical history.

You usually lie still while electrodes are placed on the chest and limbs. The recording itself is brief and should not deliver an electric shock. Tell the paramedic about symptoms, medicines, heart conditions, implanted devices and when the problem began. Keep still and breathe normally unless instructed otherwise; movement, shivering or loose electrodes can create artefacts that make interpretation harder.

Call emergency services for pressure or pain in the chest, severe breathlessness, collapse, fainting with ongoing symptoms, or a new fast or irregular heartbeat with dizziness. An ECG can support rapid decisions, but a reassuring tracing does not explain every cause of discomfort. Follow the emergency team’s advice about transport, observation and further testing.

Ask what the tracing showed, whether repeat ECGs or blood tests are needed, how your symptoms affect the interpretation, and which warning signs should prompt another emergency call.