Key result
Induced ventricular fibrillation episodes exhibited a higher dominant frequency than spontaneous episodes (4.75 ± 0.57 vs. 3.95 ± 0.59 Hz, P=0.002).
Why the study?
Do spectral characteristics of intracardiac electrograms differ between induced and spontaneous ventricular fibrillation in ICD patients?
Observational (n=13)
Do spectral characteristics of intracardiac electrograms differ between induced and spontaneous ventricular fibrillation in ICD patients?
Absolute Event Rate: 4.75% vs 3.95%
p-value: p=0.002
Induced ventricular fibrillation episodes exhibit higher dominant frequencies and greater organization than spontaneous episodes, suggesting differences in the electrophysiological substrate or arrhythmia wavefront at onset.
May warrant caution extrapolating induced VF data to spontaneous events in ICD patients; leaves open whether spectral features inform substrate-targeted therapies.
AIMS: Very limited data are available on the differences between spontaneous and induced episodes of ventricular fibrillation (VF) in humans. The aim of the study was to compare the spectral characteristics of the electrical signal recorded by an implantable cardioverter defibrillator (ICD) during both types of episodes. METHODS AND RESULTS: Thirteen ICD patients with at least one spontaneous and one induced VF recorded by the device were included in the study. A spectral representation was obtained for the first 3 s of the intracardiac unipolar electrogram during VF. The dominant frequency (f(d)), the peak power at f(d), an organization index (OI), a bandwidth measurement, and an estimate of the correlation with a sinusoidal wave (leakage) were estimated for each episode. The f(d) was higher in induced episodes (4.75 +/- 0.57 vs. 3.95 +/- 0.59 Hz for the spontaneous episodes, P = 0.002), as well as the degree of organization assessed by the OI, bandwidth, and leakage parameters. CONCLUSION: Clinical and induced VF episodes in humans have different spectral characteristics. Changes in the electrophysiological substrate or in the location of the arrhythmia wavefront at onset could play a role to explain the observed differences.
No takes yet. Share an insight, caveat, or question.
Sánchez-Muñoz et al. (2008) conducted an observational in Ventricular fibrillation (n=13). Induced ventricular fibrillation vs. Spontaneous ventricular fibrillation was evaluated on Dominant frequency (f(d)) of the intracardiac unipolar electrogram (p=0.002). Induced ventricular fibrillation episodes exhibited a higher dominant frequency than spontaneous episodes (4.75 ± 0.57 vs. 3.95 ± 0.59 Hz, P=0.002).
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: