Contec ECG machine explained

During an ECG, electrodes are placed on selected areas of the chest and limbs. Wires carry the detected signals to the machine, which turns them into waveforms. These waveforms can show the timing and regularity of heartbeats and may provide clues about how electrical impulses travel through the heart.

The machine's automated comments, if shown, are prompts rather than a final diagnosis. A clinician checks the quality of the recording and interprets it alongside your symptoms, medicines, examination, and medical history. See the [ECG Machine](/technology/ecg-machine/) overview or the [Electrocardiogram](/treatments/diagnostics-and-screening/ecg/) guide.

The clinician may ask you to uncover parts of your chest and lie still. Avoid conversation and movement while the tracing is taken because muscle activity can create interference. Tell the clinician if an electrode causes discomfort or if you have fragile skin. You can usually resume ordinary activities after the recording unless your clinician gives different advice.

Arrange prompt assessment for new palpitations, repeated dizziness, fainting, breathlessness, or chest discomfort. Call emergency services for severe or persistent chest pain, severe breathing difficulty, collapse, or symptoms of a serious allergic reaction. Do not rely on a scheduled ECG when symptoms are suddenly severe.

Ask what the ECG is checking, whether medicines or activity need to be adjusted beforehand, when you will receive an interpretation, and what follow-up is planned if the tracing is unclear. Mention previous ECG results and any episodes that began outside the clinic.