In analyzing a patient's electrocardiographic (ECG) rhythm strip, the nurse uses the knowledge that the time of the conduction of an impulse through the Purkinje fibers is represented by the

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The PR interval represents depolarization of the atria, AV node, bundle of His, bundle branches, and the Purkinje fibers, up to the point of depolarization of the ventricular cells. The P wave represents atrial depolarization. The QRS represents ventricular depolarization. The QT interval represents depolarization of the depolarization and repolarization of the entire conduction system.

In Analyzing a Patient's Electrocardiographic (ECG) Rhythm Strip, the Nurse