Facilitation of conduction in left bundle of His.

Conduction disturbances located within the His bundle.

SUMMARY Four patients are described with different degrees of conduction disturbance within the His bundle. In one patient with a Mobitz type II atrioventricular (A-V) block with normal QRS complexes the blocked atrial beats were followed by a His potential. Since the QRS complexes of the conducted beats were completely normal, the site of the block was thought to be in the distal part of the H...

Longitudinal dissociation in the His bundle. Bundle branch block due to asynchronous conduction within the His bundle in man.

Antegrade concealed conduction to the His bundle; documentation with His bundle recording.

Concealed intraventricular conduction in the His bundle electrogram.

Multiple areas of concealed intraventricular conduction are deduced on the basis of aftereffects observed in His bundle recordings. Electrocardiograms and His bundle recordings are presented from two patients with unstable bilateral bundle branch block, the instability of which depended on the interval at which ventricular depolarization was initiated by sinus or paced impulses. This circumstan...

Asynchronous Conduction within the His Bundle in Man

18. von der Groeben J, Fisher DD, Toole JG: Temporospatial frequency distribution of P, QRS, and T in normal man and woman. Am Heart J 75: 487, 1968 19. Ishikawa H: Sex and age differences in the Frank vectorcardiograms of normal Japanese adults. Jap Circ J 37: 543, 1973 20. Simonson E: The effect of age on the electrocardiogram. Am J Cardiol 29: 64, 1972 21. McCall BW, Wallace AG, Estes EH Jr:...