Certified EkG technician (CET) Practice Exam

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What does a consistent R-R wave interval indicate?

Irregularity in heart rhythm
Consistent heart rate
Pacing from an external device
Presence of arrhythmia

The correct answer is: Consistent heart rate

A consistent R-R wave interval indicates a stable and regular heart rate. The R-R interval measures the time between successive R waves of the QRS complex on an electrocardiogram (ECG), which represents ventricular depolarization. When these intervals are consistent, it demonstrates that the heart is contracting at regular intervals, suggesting that the electrical activity of the heart is normal and predictable. This consistency is crucial in identifying normal sinus rhythm and in differentiating between potential cardiac issues. A variable R-R interval could suggest irregular rhythms, such as arrhythmias, which fluctuate in timing and may lead to further implications for cardiac health. Therefore, recognizing a consistent R-R wave interval is essential for assessing heart rhythm stability and evaluating overall cardiac function.