| Rate | atrial rate is usually normal; ventricular rate is usually less than 70/bpm. The atrial rate is always faster than the ventricular rate. |
| P wave | normal with constant P-P intervals, but not "married" to the QRS complexes. |
| QRS | may be normal or widened depending on where the escape pacemaker is located in the conduction system |
| Conduction | atrial and ventricular activities are unrelated due to the complete blocking of the atrial impulses to the ventricles. |
| Rhythm | irregular |
Complete block of the atrial impulses occurs at the A-V junction, common bundle or bilateral bundle branches.
Another pacemaker distal to the block takes over in order to activate the ventricles or ventricular standstill will occur.
May be caused by:
Treatment modalities include:
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