Key result
VE-VASP reveals intact VA conduction in ~42% of patients missed by standard ventricular pacing.
Why the study?
The standard method for assessing ventriculoatrial conduction using constant cycle length ventricular pacing may fail to detect intact VA conduction in some patients.
Does the VE-VASP method improve the detection of intact ventriculoatrial conduction in patients who show no evidence of it during constant cycle length ventricular pacing?
Observational (n=12)
No
Does the VE-VASP method improve the detection of intact ventriculoatrial conduction in patients who show no evidence of it during constant cycle length ventricular pacing?
Absolute Event Rate: 41.7% vs 0%
The VE-VASP method can unmask intact ventriculoatrial conduction in a significant proportion of patients who appear to lack it during standard constant cycle length ventricular pacing.
May question adequacy of standard pacing to exclude VA conduction; leaves open whether VE-VASP refines EP diagnostics or outcomes.
The presence or absence of ventriculoatrial (VA) conduction in the human heart is assessed by investigating whether 1:1 retrograde atrial capture is observed during constant cycle length ventricular pacing. In this study, a new pacing protocol for assessing VA conduction was designed in which the ventricular extrastimulus was delivered during basic ventricular and atrial simultaneous pacing (VE-VASP method). The effect of this pacing protocol on VA conduction was investigated in 12 patients who showed no evidence of VA conduction with the constant cycle length ventricular pacing method. In 5 of 12 patients, intact VA conduction was demonstrated with the VE-VASP method, while VA conduction was not observed in the remaining 7 patients. These results suggest that VE-VASP method sometimes demonstrates the presence of intact VA conduction in patients who show no evidence of VA conduction during constant cycle length ventricular pacing.
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Suzuki et al. (1985) conducted an observational in Absent ventriculoatrial conduction during constant cycle length ventricular pacing (n=12). VE-VASP method vs. Constant cycle length ventricular pacing was evaluated on Demonstration of intact ventriculoatrial conduction. The VE-VASP method demonstrated intact ventriculoatrial conduction in 5 of 12 patients (42%) who showed no evidence of conduction during standard constant cycle length ventricular pacing.
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