NSR in the context of AVNRT ablation stands for which heart rhythm?

• A. Normal Sinus Rhythm
• B. Non-sustained rhythm
• C. Neurogenic sinus rhythm
• D. Normal sympathetic rhythm

Answer: (A)

Normal Sinus Rhythm is NSR; in AVNRT ablation, NSR indicates the heart is beating with the natural pacemaker from the SA node, not in a reentrant tachycardia. After a successful ablation, the rhythm typically returns to NSR, meaning a regular rhythm with P waves before each QRS complex and a normal rate, reflecting proper atrial and ventricular conduction. The other terms aren’t standard ways to describe the resting rhythm in this setting (non-sustained rhythm refers to brief tachyarrhythmias, and neurogenic sinus rhythm or normal sympathetic rhythm aren’t used to label the typical postoperative rhythm).