The electrocardiogram (ECG)
An electrocardiogram, or ECG, records the rhythm and electrical activity of your heart. Some people have an ECG before having an operation. Others have one as part of a routine health check-up, even if there is no suspicion of heart disease. Motor racing drivers, scuba drivers, marathon runners, sport person should have screening cardiac tests routinely.
Several small patches, set in sticky plaster, are put on your arms, legs and chest and connected to a recording machine. The patches, called 'electrodes', are connected to wires which lead to the ECG recorder. This recorder picks up the electrical signals produced by each heartbeat. The machine records a few beats from each set of electrodes onto paper.
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