Parasystolic ventricular tachycardia with variable exit block

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.