title: Parasystolic ventricular tachycardia with variable exit block.
abstract: This case is an example of ventricular parasystolic tachycardia associated with variable expressions of ectopic-ventricular (E-V) exit block. The exit block manifested with 2:1, 3:2, 4:3 and higher ratios of E-V conductions, interspaced with periods of 1:1 conduction. Concealed E-V conduction of the ectopic impulse could also be deduced.
mesh_terms: D000368:Aged; D000787:Angina Pectoris / Q000175:diagnosis; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D006327:Heart Block / Q000175:diagnosis*; D006801:Humans; D008297:Male; D009200:Myocardial Contraction; D013599:Systole; D013610:Tachycardia / Q000175:diagnosis*