Key result
Stroke impedance measured via an impedance catheter was significantly lower in hemodynamically unstable ventricular arrhythmias compared to stable tachyarrhythmias.
Why the study?
Does right ventricular stroke impedance measured by an impedance catheter differentiate between hemodynamically stable and unstable arrhythmias?
Observational (n=12)
Does right ventricular stroke impedance measured by an impedance catheter differentiate between hemodynamically stable and unstable arrhythmias?
Impedance catheter measurement of right ventricular stroke impedance can differentiate hemodynamically stable from unstable arrhythmias, potentially improving sensing algorithms for implantable defibrillators.
An assessment is made of the efficacy of the impedance catheter in sensing relative volumetric changes in the right ventricle as a means of monitoring the hemodynamic status during an arrhythmia. During electrophysiologic testing, 37 arrhythmias were induced in 12 patients. Stroke impedance (peak value minus minimum value) was significantly lower in hemodynamically unstable ventricular arrhythmias (ventricular tachycardia and ventricular fibrillation) than in stable tachyarrhythmias (supraventricular tachycardia and stable monomorphic ventricular tachycardia). Implementation of hemodynamic sensing can improve arrhythmia specificity of the sensing algorithm of future implantable defibrillators and may add options for selective pace termination or cardioversion.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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Khoury et al. (2003) conducted an observational in Arrhythmias (n=12). Impedance catheter was evaluated on Stroke impedance (peak value minus minimum value). Stroke impedance measured via an impedance catheter was significantly lower in hemodynamically unstable ventricular arrhythmias compared to stable tachyarrhythmias.
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