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what is chemical composition of QRS ?
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The QRS complex is the combination of three of the graphical deflections seen on a typical electrocardiogram (ECG or EKG).
It is usually the central and most visually obvious part of the tracing; in other words, it's the main spike seen on an ECG line.
It corresponds to the depolarization of the right and left ventricles of the human heart and contraction of the large ventricular muscles.
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