<unk>  is an uncommon dysrhythmia in which the electrical impulse is delayed or<unk> ed on the way to the atria, thus delaying atrial depolarization. It is characterized by the omission of P waves in the setting of a basic regular rhythm.  It is found incidentally in normal asymptomatic subjects and in some having pre syncope or syncope.  It may occur as an isolated dysrhythmia or in association with sinus bradycardia, tachycardia or sometimes with atrioventricular conduction disorders.
Sinoatrial block
Atrioventricular dissociation
Fascicular VT
Left bundle branch block
Right bundle branch block
Paroxysmal AV block
Supraventricular arrhythmias
Bundle branch block