<unk>  (AV<unk>  is a medical condition in which the nerve impulse generated in the sinoatrial node (SA node) in the atrium of the heart can not propagate to the ventricles. Because the impulse is<unk> ed, an accessory pacemaker in the lower chambers will typically activate the ventricles. This is known as an escape rhythm. Since this accessory pacemaker also activates independently of the impulse generated at the SA node, two independent rhythms can be noted on the electrocardiogram (ECG). * The P waves with a regular P-to-P interval (in other words, a sinus rhythm) represent the first rhythm. * The QRS complexes with a regular R-to-R interval represent the second rhythm. The PR interval will be variable, as the hallmark of complete heart<unk>  is the lack of any apparent relationship between P waves and QRS complexes.
Third-degree atrioventricular block
Second-degree atrioventricular block
First-degree atrioventricular block
Ventricular escape beat
AV nodal reentrant tachycardia
Wandering atrial pacemaker
Re-entry ventricular arrhythmia
Left bundle branch block