Rhythm Identification Decision Tree
by Laura Phillips

1. Are there pacer spikes?
1.1. Yes
1.1.1. Spike Before P Wave?
1.1.1.1. Atrial Paced
1.1.2. Spike Before QRS Complex?
1.1.2.1. Ventricular Paced
1.1.3. Spike before both?
1.1.3.1. AV paced/dual chambered
1.2. No
1.2.1. Look for P waves
2. Are there P waves?
2.1. No
2.1.1. Are there QRS complexes?
2.1.1.1. Yes
2.1.1.1.1. Wide QRS Complexes
2.1.1.1.2. Narrow QRS Complexes
2.1.1.2. No
2.1.1.2.1. Rate /Origin
2.2. Yes
2.2.1. Is there a P for every QRS?
2.2.1.1. No
2.2.1.1.1. 2nd degree Heart block type 1
2.2.1.2. Yes
2.2.1.2.1. Rate/Origin