On a normal EKG (electrocardiogram) tracing, the first wave to show a downward deflection is theQ wave. The EKG tracing consists of several waves: the P wave (representing atrial depolarization), the QRS complex (representing ventricular depolarization), and the T wave (representing ventricular repolarization). The Q wave is the initial negative deflection after the P wave and before the R wave in the QRS complex.Reference:Nationally Registered Certified Medical Assistant study materials and standard cardiology references.
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