Which describes Normal Sinus Rhythm?

Which describes Normal Sinus Rhythm?

• A. NSR
• B. P Wave
• C. PR Interval
• D. Polarization

Answer: (A)

Normal Sinus Rhythm is the heart’s regular, orderly rhythm that starts from the sinoatrial node. In a healthy adult, this rhythm is typically 60–100 beats per minute, with a consistent rhythm, a P wave before every QRS complex, a normal PR interval, and a narrow QRS. The term NSR directly describes this overall pattern. The other options point to parts of the ECG tracing or separate concepts rather than the rhythm as a whole. A P wave represents atrial depolarization, not the entire rhythm. The PR interval measures the time from the start of atrial depolarization to the start of ventricular depolarization, not the rhythm itself. Polarization refers to membrane resting potential, which is not a description of the heart’s rhythmic pattern on an ECG.

Normal Sinus Rhythm is the heart’s regular, orderly rhythm that starts from the sinoatrial node. In a healthy adult, this rhythm is typically 60–100 beats per minute, with a consistent rhythm, a P wave before every QRS complex, a normal PR interval, and a narrow QRS. The term NSR directly describes this overall pattern.

The other options point to parts of the ECG tracing or separate concepts rather than the rhythm as a whole. A P wave represents atrial depolarization, not the entire rhythm. The PR interval measures the time from the start of atrial depolarization to the start of ventricular depolarization, not the rhythm itself. Polarization refers to membrane resting potential, which is not a description of the heart’s rhythmic pattern on an ECG.