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Can Changes in Transcardiac Impedance Appropriately Detect Ventricular Fibrillation?

Transcardiac impedance, as measured between two implanted defibrillator patches, has been shown to vary in peak‐to‐peak magnitude in response to the contractions of the ventricles. These variations in transcardiac impedance are known as AZ. This study was aimed at determining if there was a significant change in the magnitude of AZ between that during normal sinus rhythm, that during ventricular fibrillation (VF), and if this change could be used as a detector of the onset of VF. This study was performed acutely on 14 anesthetized dogs.