Summary
The effects of premature ventricular stimulation on intracardiac conduction and ventricular vulnerability were compared during a ventricular versus a supraventricular rhythm in 52 patients. Using the extrastimulus technique, premature right ventricular (RV) stimuli of double diastolic threshold and 1 ms duration were induced with increasing prematurity after every tenth basic beat until the effective refractory period of the RV myocardium was reached.
There was a striking difference in the frequency of ventricular vulnerability when both stimulation techniques were compared in the individual case. Ventricular vulnerability which was defined as repetitive ventricular response to one single test impulse occurred with a decreasing frequency of 61%, 50% and 31% of all patients studied at the rates of 80, 100 and 120/min during the RV drive rhythm; repetitive ventricular firing, however, was not observed in a single case after premature RV stimulation during a right atrial (RA) drive rhythm. The vulnerability of the RV myocardium was restricted to mainly one spontaneous extrasystole revealing no tendency to an, acceleration of the arrhythmia. Concomitantly, there was a strong correlation between the occurrence of repetitive firing and a prolonged, critical conduction delay of the premature RV test impulse during the RV drive. In contrast, measurably prolonged intraventricular conduction times during the RA drive rhythm could rarely be demonstrated never reaching the critical delay to exhibit vulnerability.
The difference in conduction time of the premature RV test impulse during both drive rhythms is interpreted as a strong argument to confine the main conduction delay of the test impulse in the distal RV Purkinje system. Therefore, local re-entry mechanisms in the distal RV Purkinje system occurring simultaneously with critical conduction delays after premature RV stimuli most likely lead, to the spontaneous extrasystoles. The rate and rhythm dependent repetitive firing is valued as a physiologic phenomenon helping to explain certain clinically observed pacemaker induced arrhythmias and to elucidate the multiform face of ventricular vulnerability.
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Fleischmann, D.W., Marschall, H.U. & De Bakker, J.M.T. Rate and rhythm dependent vulnerability of the human ventricular myocardium. Basic Res Cardiol 74, 203–223 (1979). https://doi.org/10.1007/BF01907821
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DOI: https://doi.org/10.1007/BF01907821