Arrhythmias in the coronary-care unit. IV. Physiologic bases of paroxysmal tachycardia-dependent bundle branch block
Neasman, A.R.; Schobel, R.C.; Lemberg, L.
Heart and Lung the Journal of Critical Care 5(1): 139-142
1976
ISSN/ISBN: 0147-9563 PMID: 1043869 Document Number: 107772
Paroxysmal BBB may be either tachycardia-dependent which is referred to as "phase 3 block" or bradycardia-dependent, referred to as "phase 4 block." Tachycardia-dependent BBB is related to prolonged recovery. Bradycardia-dependent BBB is related to hypopolarization and SDD. These fundamental electrophysiological properties aid in understanding of transient BBB occurring during an acute MI.