Normal Sinus Rhythm (NSR) 

Normal Sinus Rhythm

The normal heartbeat initiated by the pacemaker in the sinus node, with a heart rate of 60 to 100 beats/ min. Mosby (2009-02-11).


Rate 60-100

Rhythm Regular

P-Waves Uniform in appearance; upright in lead 2. Proceeds each QRS.

PR Interval 0.12 sec-0.20 sec (3-5 boxes) and constant from beat to beat

QRS Duration 0.11 sec (Almost 3 boxes) or less





© Matt Dillard 2012