Which term denotes the rest phase of the ECG cycle?

Which term denotes the rest phase of the ECG cycle?

• A. QT Interval
• B. Rep­olarization
• C. Segment
• D. Sinus Bradycardia

Answer: (B)

Repolarization denotes the resting phase of the heart’s electrical cycle, as the ventricular myocardium returns to its resting membrane potential after contraction. On the ECG, this phase is represented by the T wave, which marks ventricular recovery and preparation for the next beat. The QT interval spans from the start of ventricular depolarization to the end of repolarization, so it includes both contraction and recovery rather than the resting period alone. A segment is a portion of the ECG waveform between waves, such as the ST segment, and doesn’t describe the resting phase by itself. Sinus bradycardia is simply a slow heart rhythm, not a specific phase of the ECG cycle. So repolarization is the term that denotes the rest phase.

Repolarization denotes the resting phase of the heart’s electrical cycle, as the ventricular myocardium returns to its resting membrane potential after contraction. On the ECG, this phase is represented by the T wave, which marks ventricular recovery and preparation for the next beat. The QT interval spans from the start of ventricular depolarization to the end of repolarization, so it includes both contraction and recovery rather than the resting period alone. A segment is a portion of the ECG waveform between waves, such as the ST segment, and doesn’t describe the resting phase by itself. Sinus bradycardia is simply a slow heart rhythm, not a specific phase of the ECG cycle. So repolarization is the term that denotes the rest phase.