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The R wave is very positive because early ventricular depolarization is largely directed toward this lead. The S wave is also present because the terminal depolarization of the upper wall of the left ventricle is directed away from aVF.
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www.cvphysiology.com/Arrhythmias/A016.htm
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The ventricular activation vector, therefore, is directed posteriorly and to the left. Due to a considerable amount of muscle-to-muscle conduction during ventricular depolarization, QRS duration frequently exceeds 120 msec.
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www.americanheart.org/presenter.jhtml?identifier=563
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The ventricular depolarization is represented graphically on the electrocardiogram by an abrupt waveform called QRS complex, as presented in the following figure. During the ventricular depolarization, the right and left ventricles contracts and pump the blood they contain.
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www.caip.rutgers.edu/~sdusan/ECG/heart.html
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Basic interpretation of electrocardiographs. ... P wave: ECG deflection representing atrial depolarization. Atrial repolarization occurs during ventricular depolarization and is obscured.
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www.sh.lsuhsc.edu/fammed/OutpatientManual/BasicECG.htm
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The second step is ventricular depolarization. Here, the ventricle contracts (systole), pushing blood into the aorta, and the atrium is repolarized. Finally, the ventricles repolarize, during which time the atrium relaxes and refills.
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www.rwc.uc.edu/koehler/biophys/3d.html
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Answers: As the heart undergo depolarization and repolarization, the electrical currents that are generated spread not only within the heart, but also throughout the body. This electrical buzz generated by the heart can be measured by an...
http://www.dcqna.com/diseases-conditions/ventricular_de...
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This patient was a 50-year-old man. ... The polymorphic VT always developed following a specific ventricular premature complex showing a left bundle branch block pattern suggesting a limited origin in the right ventricle.
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www.medscape.com/medline/abstract/12494627
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Preventive pacing algorithms designed to eliminate the pause that follows a premature ventricular depolarization have been incorporated in current implantable defibrillators. ... The Medscape Journal ... Allergy & Clinical Immunology...
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www.medscape.com/medline/abstract/11025907
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Asystole is cardiac standstill with no cardiac output and no ventricular depolarization; it eventually occurs in all dyi ... Primary asystole occurs when the heart's electrical system intrinsically fails to generate a ventricular depolarization. This may result from ischemia or from degeneration (ie, sclerosis) of the...
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www.emedicine.com/emerg/byname/asystole.htm
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