Electrocardiograms

An ECG trace consists of waves, recorder from the electrical stimulations via the 12 leads. A standard wave consits of PQRST elements, as shown:

The ECG trace below shows a normal ECG:

In the case of a ischaemia during exercise or after a myocardial infarction, an ECG trace may be characterised by an ST-segment elevation in the V4 lead, for example:

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