What should you know about an ECG machine with suction cups?

The suction cups are a way to keep chest electrodes in steady contact with the skin. A printed or digital tracing shows the timing and pattern of electrical activity, including the rhythm and rate. The tracing is not a diagnosis by itself. Movement, shivering, loose contact, body hair, or a dry electrode can create interference, so a clinician may adjust a cup and repeat part of the recording.

Wear clothing that allows access to the chest and lower arms or legs. Tell the clinician about chest tenderness, a skin rash, an allergy to adhesive, or difficulty lying flat. During the recording, remain still, breathe normally, and avoid talking unless you need help. The cups may feel cool or tug slightly when removed, but they should not pierce the skin.

An ECG may be arranged for symptoms such as chest discomfort, breathlessness, fainting, or an irregular heartbeat. Seek emergency care for severe or persistent chest pain, marked difficulty breathing, fainting, or symptoms with sweating, weakness, or confusion. Do not wait for an ECG appointment when symptoms are sudden or worsening.

Ask what prompted the ECG, whether the recording was clear, and when you should receive an explanation. You can also ask whether you need a repeat ECG, a longer rhythm monitor, or another assessment based on your symptoms.