NSR is an abbreviation used on ECGs to indicate which rhythm?

• A. Non-specific Rhythm
• B. Normal Sinus Rhythm
• C. Neural Sinus Response
• D. New Standard Rhythm

Answer: (B)

NSR means the rhythm is normal and sinus-originated. An impulse starts in the sinoatrial node, so you see a P wave before every QRS complex, the PR interval is normal (about 0.12–0.20 seconds), and the QRS is narrow. The rhythm is regular, and the heart rate sits in the normal adult range (roughly 60–100 beats per minute). These findings together indicate intact atrial depolarization and conduction through the ventricles, with no ectopic beats or rhythm disturbances. Other terms like non-specific rhythm or neural/ new standard rhythm aren’t standard ECG labels, so NSR specifically denotes a normal sinus rhythm.