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Discrimination of fast ventricular tachycardia from ventricular fibrillation and slow ventricular tachycardia for an implantable pacer-cardioverter-defibrillator

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5 Author(s)
Olson, W.H. ; Tacharrhythmia Res., Medtronic Inc., Minneapolis, MN, USA ; Peterson, D.K. ; Ruetz, L.L. ; Gunderson, B.D.
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Implantable Pacer-Cardioverter-Defibrillators (PCD) sense ventricular electrograms from epicardial or endocardial leads with an auto-adjusting threshold and analyze a recent series of cycle lengths with algorithms to detect ventricular tachycardia (VT) and ventricular fibrillation (VF) for tiered therapies. A new algorithm to detect fast ventricular tachycardia (FVT) in a zone between VT and VF either via VT-type counting or via VF-type counting is described. Gaussian strings of cycle lengths with uniformly distributed means and standard deviations and databases of human tachyarrhythmias are analyzed. Detection algorithm sensitivity, specificity with 95% confidence intervals and the predictive value of a positive test for VF (PVP) are studied as a function of programmable defection parameters. While maintaining 100% VF sensitivity, VF specificity is increased by 20% for FVT via VF thereby safely reducing the number of painful shocks

Published in:

Computers in Cardiology 1993, Proceedings.

Date of Conference:

5-8 Sep 1993

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