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Modulated Parasystole Complicating Permanent Ventricular Pacing: The Different Influence of Spontaneous and Paced Impulses Upon the Parasystolic Rhythm

ORETO, G., et al.: Modulated Parasystole Complicating Permanent Ventricular Pacing: The Different Influence of Spontaneous and Paced Impulses Upon the Parasystolic Rhythm A case of modulated ventricular parasystole observed in a patient with a VVIM pacemaker is reported. Analysis reveals that the electrotonic influence (modulation) effected upon the parasysiolic focus hy the sinus impulses is different from that exerted by the paced impulses. Furthermore, fusion beats reflect an intermediate modulating effect according to the prevalence of the sinus or the paced wavefront.