When a patient is undergoing synchronized cardioversion, the nurse recognizes that cardioversion currents are synchronized with what part of the patient's ECG?

A. P wave: The P wave represents atrial depolarization. Synchronizing a cardioversion shock to the P wave is not standard practice, as delivering a shock during atrial depolarization could precipitate ventricular arrhythmias rather than correcting a tachyarrhythmia. B. T wave: The T wave represents ventricular repolarization. Delivering a shock on the T wave (the vulnerable period) can induce ventricular fibrillation, which is dangerous and avoided during synchronized cardioversion. C. R wave of the QRS: Synchronized cardioversion delivers the electrical shock on the R wave of the QRS complex, during ventricular depolarization. This timing avoids the vulnerable period of repolarization (T wave) and allows the shock to terminate tachyarrhythmias safely while minimizing the risk of inducing ventricular fibrillation. D. PR interval: The PR interval represents the conduction time from the atria to the ventricles. Synchronizing the shock to this interval is not effective for treating arrhythmias and does not provide the safety mechanism inherent in R wave synchronization.