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KMID : 1011920170180020096
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International Journal of Arrhythmia
2017 Volume.18 No. 2 p.96 ~ p.99
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QRS complex
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Kim Jun-Soo
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Abstract
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The QRS complex is a group of waves in the electrocardiogram (ECG), and represents ventricular activation. It usually consists of three wave forms. The Q wave is an initial negative wave at the onset of the QRS complex. The R wave is the first positive wave in the QRS complex, and appears at the onset of the QRS complex or following a Q wave. The S wave is a second negative wave in the QRS complex. The morphology of the QRS complex is useful in interpreting a 12-lead ECG because it provides clinical information regarding heart rate, QRS axis, heart position, rotation, and abnormal conduction in the ventricles.
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KEYWORD
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ECG, Pacemaker, QRS complex, Heart Rate
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FullTexts / Linksout information
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