Key result
Ventriculo-atrial conduction was observed in 19.4% to 60% of patients depending on atrio-ventricular conductivity, but the differences between groups were not statistically significant, indicating VA conduction cannot be predicted from antegrade conductivity.
Why the study?
Does antegrade AV conductivity predict retrograde VA conduction in patients undergoing electrophysiologic study?
Cross-Sectional (n=133)
No
Does antegrade AV conductivity predict retrograde VA conduction in patients undergoing electrophysiologic study?
p-value: p=not significant
Ventriculo-atrial conduction can occur independently of antegrade atrio-ventricular conductivity, emphasizing the need to evaluate retrograde conduction individually in patients considered for pacemaker implantation to prevent endless loop tachycardia.
Ventriculo-atrial (VA) conduction was studied in 133 patients with various kinds of arrhythmias using intracardiac electrograms and programmed stimulation. One-to-one VA conduction was observed during RV pacing at the rate just above the sinus rate in 6 of 31 patients (19.4%) with advanced AV block, in 7 of 26 patients (26.9%) with impaired AV nodal conduction, in 25 of 71 patients (35.2%) with normal AV nodal conduction and 3 of 5 patients (60%) with enhanced AV nodal conduction. However, the differences between these groups were not significant. There was no significant difference in either the AH block rate during RA pacing or the antegrade functional refractory period (FRP) of the AV node in patients with or without VA conduction, and the VA block rate during RV pacing was not significantly correlated with the AH block rate or the FRP of the AV node. VA conduction time (S-HRA) also showed no significant differences between these groups. The mean VA conduction time during RV pacing at rates of 60 to 80 bpm was 208 +/- 87 msec, ranging from 100 to 395 msec. In conclusion, AV conduction disturbances may influence VA conduction, but VA conduction cannot be predicted from antegrade conductivity.
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Inoue et al. (1985) conducted a cross-sectional in Arrhythmias or symptoms of palpitation, syncope or dizziness (n=133). Atrio-ventricular conduction disturbances vs. Normal or enhanced atrio-ventricular conduction was evaluated on Presence of one-to-one ventriculo-atrial (VA) conduction during right ventricular pacing (p=not significant). Ventriculo-atrial conduction was observed in 19.4% to 60% of patients depending on atrio-ventricular conductivity, but the differences between groups were not statistically significant, indicating VA conduction cannot be predicted from antegrade conductivity.
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