Isoelectric line

P Wave

PR interval

QRS complex

J point

S-T segment

T wave

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[Return] Fig 3.1

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Fig. 3.1 Generation of the ECG and depolarisation of the heart as an electrical impulse travels from the sinoatrial (SA) node. The ECG recorder is attached in such a way that the negative electrode is at the base of the heart and the positive at the apex; this approximates to lead II. (Modified from Tilley (1992) with kind permission.)