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 delta Z. This study was aimed at determining if there was a significant change in the magnitude of delta Z 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.
Weiss
S M
SM
Telectronics Pacing Systems, Lane Cove, N.S.W., Australia.
Einstein
R
R
McCulloch
R
R
D000818:Animals; D001794:Blood Pressure / Q000502:physiology; D004285:Dogs; D004553:Electric Conductivity; D004554:Electric Countershock / Q000295:instrumentation*; D004867:Equipment Design; D005260:Female; D006321:Heart / Q000502:physiology; D008297:Male; D009200:Myocardial Contraction / Q000502:physiology; D019736:Prostheses and Implants; D012815:Signal Processing, Computer-Assisted; D014693:Ventricular Fibrillation / Q000175:diagnosis* / Q000628:therapy