Normal Sinus Rhythm
Atrial rate Regular; P to P is regular, 60 to 100 beats pre minutes
Ventricular rate Regular; R to R is regular, 60 to 100 beats pre minutes
P waves P wave before every QRS complex
QRS Unchanged unless aberrant conduction due to premature beat or increased rate
Intervals • PR: 0.12 to 0.20 sec • QRS: <0.12 sec