Depolarization of the atria produces the P wave; depolarization of the ventricles produces the QRS complex. Repolarization of the ventricles causes the T wave. The significance of the U wave is uncertain, but it may be due to repolarization of the Purkinje system.
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www.americanheart.org/presenter.jhtml?identifier=71
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Since the initial part of the P wave is due to right atrial depolarization, enlargement of the right atrium produces a P wave prominence (peaked P waves) in leads II and aVF without necessarily increasing P ... Consequently, there is characteristic alteration in the balance of electrical forces between the ventricles.
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www.americanheart.org/presenter.jhtml?identifier=563
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The P-wave represents the electrical excitation (or depolarization) of the atria, which leads to the contraction of both atria. The QRS complex represents the depolarization of the ventricles, which initiates the ventricular contraction.
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www.hhmi.org/biointeractive/vlabs/cardiology/content/dt...
www.hhmi.org/biointeractive/vlabs/cardiology/content/dtg/ecg/ecg.html
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P wave: the sequential activation (depolarization) of the right and left atria; QRS complex: right and left ventricular depolarization (normally the ventricles are activated simultaneously); ST-T wave: ventricular repolarization;
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library.med.utah.edu/kw/ecg/ecg_outline/Lesson1/index.h...
library.med.utah.edu/kw/ecg/ecg_outline/Lesson1/index.html
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Under the influence of cardiotonic steroids, single ventricular cells exhibit transient depolarization after a train of driven action potentials or, in voltage clamp experiments, transient inward current after a depolarizing clamp pulse.
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circres.ahajournals.org/cgi/content/abstract/51/2/142
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D) Pre-excitation of the ventricles is correct. ... Depolarization of the ventricles is prolonged because the process does not utilize the normal conduction pathways.
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www.medscape.com/content/1999/00/41/09/410954/ans4.html
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The mean electrical axis is the average of all the instantaneous mean electrical vectors occurring sequentially during depolarization of the ventricles. The figure to the right depicts the sequence of depolarization within the ventricles.
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www.cvphysiology.com/Arrhythmias/A016.htm
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The different waves that comprise the ECG represent the sequence of depolarization and repolarization of the atria and ventricles. The ECG is recorded at a speed of 25 mm/sec, and the voltages are calibrated so that 1 mV = 10 mm in the vertical direction.
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www.cvphysiology.com/Arrhythmias/A009.htm
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Modeling abnormal depolarization of the ventricles may provide a means to localize sites of arrhythmia foci from the body surface recordings. In this paper, we present a single moving dipole (SMD) model of the ventricular depolarization.
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lib.bioinfo.pl/pmid:16817614
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