Concealed Paroxysmal Atrioventricular Block: Diffuse Congenital Atrioventricular Conduction System Disorder with Nonpropagated His Bundle Depolarizations

Concealed paroxysmal atrioventricular block: diffuse congenital atrioventricular conduction system disorder with nonpropagated His bundle depolarizations.

A 2 1/2-year-old girl with bradycardia and left bundle branch block at birth began to experience "night cries" when deeply asleep. Electrophysiological study demonstrated congenital diffuse atrioventricular conduction disease with concealed paroxysmal atrioventricular block, nonpropagated His bundle depolarizations, severe sinus node abnormality, and a low atrioventricular junctional escape rhy...

Concealed retrograde conduction in complete atrioventricular block.

INCOMPLETE TRANSMISSION of impulses across the atrioventricular (A-V) junction has held a special fascination for many investigators.'14 Varied investigational techniques including venous pulse waves, standard electrocardiograms, and direct catheter electrode recordings from the cardiac chambers have been used to further the understanding of retrograde transmission of impulses into the A-V junc...

Pseudo A-V block secondary to premature nonpropagated His bundle depolarizations: documentation by His bundle electrocardiography.

Concealed and supernormal atrioventricular conduction.

THE FAILURE of a cardiac impulse to traverse the entire atrioventricular (AV) conducting system is called concealed conduction. Electrocardiographically, the effects of concealed conduction are reflected in the conduction and/or formation of subsequent beats.1 The concept of concealed conduction can be applied to explain (1) post-extrasystolic prolongation of the P-R interval, (2) the irregular...

His bundle recordings in paroxysmal atrioventricular block produced by carotid sinus massage.

Electrograms from the bundle of His were recorded in two patients with acute myocardial infarction during paroxysmal atrioventricular block induced by carotid sinus massage. From the viewpoint of the surface electrocardiogram this arrhythmia was considered as a form of Type II (Mobitz) Ulo:k, the onset of which was related to a decrease in atrial rate. In the first patient, the conduction distu...