Rules for Normal Sinus Rhythm
Regularity: R-R intervals are regular, overall rhythm is regular. Rate: The rate is between 60 and 100 beats/min. P WAVE: There is one p wave in front of every QRS. The P waves appear uniform. PRI: Measures between 0.12 and 0.20 seconds in duration. PRI is consistent. QRS: Measures less than 0.12 seconds. 