| Dysrhythmia | Rate | Rhythm | P Waves | PR Interval | QRS Complex |
| Sinus Bradycardia | <60 | Regular | Upright & Normal | Normal | Normal |
| Sinus Tachycardia | >100 | Regular | Upright & Normal | Normal | Normal |
| Sinus Dysrhythmia | 60 - 100 | Irregular | Upright & Normal | Normal | Normal |
| Sinus Arrest | Normal to slow | Irregular | Upright & Normal | Normal | Normal |
| First Degree AV Block | Depends on underlying rhythm | Usually regular | Normal | >0.20 sec | Usually <0.12 sec |
| Type I Second Degree AV Block | Atrial - normal, ventricular – normal to slow | atrial – regular, ventricular -- irregular | Normal, some P waves not followed by QRS complex | Increases until QRS drops, then repeats | Usually <0.12 sec |
| Type II Second Degree AV Block | Atrial - normal, ventricular – normal to slow | may be regular or irregular | Normal, some P waves not followed by QRS complex | Constant for conducted beats, may be >0.12 sec. | Normal or >0.12 sec |
| Third Degree AV Block | Atrial - normal, ventricular – 40 - 60 | Both atrial and ventricular are regular | Normal with no correlation to QRS complex | No relation to QRS complex | 0.12 sec or greater |
| Premature Junctional Contractions | Depends on underlying rhythm | Depends on underlying rhythm | Inverted, may occur after QRS complex | Normal if P wave occurs before QRS complex | Usually normal |
| Junctional Escape Complexes and Rhythms | 40 - 60 | Irregular in single occurrence; regular in escape rhythm | Inverted, may occur after QRS complex | Normal if P wave occurs before QRS complex | Usually normal |
| Accelerated Junction Rhythm | 60 -100 | Regular | Inverted, may occur after QRS complex | Normal if P wave occurs before QRS complex | Normal |
| Paroxysmal Junctional Tachycardia | 100 - 180 | Regular | Inverted, may occur after QRS complex | Normal if P wave occurs before QRS complex | Normal |
