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Electrocardiography 

Electrocardiography

Chapter:
Electrocardiography
Author(s):

Andrew R. Houghton

and David Gray

DOI:
10.1093/med/9780199204854.003.160301_update_002

Update:

March 2014 – chapter reviewed; no significant changes required.

Updated on 29 Oct 2015. The previous version of this content can be found here.
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date: 23 June 2017

The ECG has been recognized as a valuable diagnostic tool since the end of the 19th century. The normal ECG waveform consists of P, QRS, and T waves (and sometimes U waves)—P waves result from atrial depolarization, QRS complexes from ventricular depolarization, and T waves from ventricular repolarization. The standard 12-lead ECG utilizes 4 limb electrodes and 6 precordial electrodes to generate 12 leads or ‘views’ of the heart’s electrical activity. There are six limb leads (termed I, II, III, aVR, aVL, and aVF) and six precordial leads (termed V1, V2, V3, V4, V5, and V6). Supplementary ‘views’ can be obtained by using additional leads, such as V7, V8, and V9 to assess the posterior aspect of the heart and right-sided chest leads to look for a right ventricular myocardial infarction....

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