Jun 2, 2005

Waveform analysis of ventricular fibrillation to predict defibrillation

Current Opinion in Critical Care
Clifton W Callaway, James J Menegazzi

Abstract

Ventricular fibrillation occurs during many cases of cardiac arrest and is treated with rescue shocks. Coarse ventricular fibrillation occurs earlier after the onset of cardiac arrest and is more likely to be converted to an organized rhythm with pulses by rescue shocks. Less organized or fine ventricular fibrillation occurs later, has less power concentrated within narrow frequency bands and lower amplitude, and is less likely to be converted to an organized rhythm by rescue shocks. Quantitative analysis of the ventricular fibrillation waveform may distinguish coarse ventricular fibrillation from fine ventricular fibrillation, allowing more appropriate delivery of rescue shocks. A variety of studies in animals and humans indicate that there is underlying structure within the ventricular fibrillation waveform. Highly organized or coarse ventricular fibrillation is characterized by large power contributions from a few component frequencies and higher amplitude. Amplitude, decomposition into power spectra, or probability-based, nonlinear measures all can quantify the organization of human ventricular fibrillation waveforms. Clinical data have accumulated that these quantitative measures, or combinations of these measures, can pre...Continue Reading

Mentioned in this Paper

Ventricular Fibrillation
Physiologic Pulse
Shock
Anterior Thoracic Region
Chest
Electroversion Therapy
Physiological Reperfusion
Chest Problem
Decision Making, Shared
Electrocardiographic Recorders

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