title: Type A alternating Wenckebach periodicity in the re-entrant path of ventricular extrasystoles.
abstract: A patient with ventricular extrasystoles is reported in whom Type A alternating Wenckebach periodicity in the re-entrant path of the extrasystoles is suggested for the first time. Namely, it appears that 2:1 exit block occurs at a proximal level in the re-entrant path and block of the Wenckebach form occurs at a distal level in the path. The presence of three-level block in the re-entrant path is also suggested in this patient.
mesh_terms: D000368:Aged; D005117:Cardiac Complexes, Premature / Q000503:physiopathology*; D004562:Electrocardiography; D006327:Heart Block / Q000175:diagnosis; D006801:Humans; D008297:Male; D010507:Periodicity; D012849:Sinoatrial Node / Q000503:physiopathology