NSR on an ECG is an abbreviation for what rhythm?

• A. Normal ECG
• B. Normal Sinus Rhythm
• C. Non-specific Rhythm
• D. Neurological Sinus Response

Answer: (B)

NSR on an ECG stands for Normal Sinus Rhythm. This means the heart’s electrical activity starts in the sinoatrial node and drives a regular, normal-paced rhythm. On the tracing, you’ll see a P wave before every QRS complex, a stable and regular RR interval, and a heart rate in the normal range (about 60–100 bpm in adults). Normal PRI and a narrow QRS indicate proper atrioventricular conduction and normal ventricular depolarization. Other terms like normal ECG, non-specific rhythm, or neurological sinus response aren’t used to describe a rhythm; NSR precisely denotes a normal rhythm originating from the sinus node.