Q wave

Q wave
Q wave 'kyü-. n the short initial downward stroke of the QRS complex in an electrocardiogram formed during the beginning of ventricular depolarization

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the downward deflection on an electrocardiogram that indicates the beginning of ventricular contraction.

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in the QRS complex, the initial downward (negative) deflection, related to the initial phase of depolarization (excitation) of the ventricular myocardium and the depolarization of the interventricular septum. See illustration at electrocardiogram.

Medical dictionary. 2011.

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