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The electrocardiography waveforms and segment: PQ segment represents the signal from the SA node to the AV node. The Q wave is produced when the AV nodes releases signals that moves through the interventricular septum. Q, R, and S waves together are referred to as QRS complex which represents the electrical forces produced by ventricular depolarization. R wave is the positive deflection after the P wave. S wave is produced when the basal parts of the ventricles are depolarized
