Rules for Atrial Tachycardia
Regularity: R-R intervals are regular, overall rhythm is regular.
Rate: Atrial and ventricular rates are the same. The rate is usually between 150-250 beats/min.
P WAVE: There is one p wave in front of every QRS. The P waves may appear different than a sinus P wave due to the rapid rate. They can be notched or flattened, and in some cases the P wave may be lost within the QRS complex.
PRI: Measures between 0.12 and 0.20 seconds in duration. PRI is consistent, but may not be easily measured due to the rate.
QRS: Measures less than 0.12 seconds.
