Apparatus and method for controlling multiple sensitivities in a

Details Apparatus and method for controlling multiple sensitivities in a Apparatus and method for controlling multiple sensitivities in a

1988-04-29

1990-07-10

Jaworski, Francis

Surgery

Truss

Pad

A61N 100

Patent

active

049400541

ABSTRACT:
An apparatus and method for tachyarrhythmia reversion uses multiple sensitivities programmed for automatic operation. A first (medium) sensitivity is used normally for the detection of sinus rhythm and ventricular tachycardia. A second (higher) sensitivity is designed for differentiating ventricular fibrillation from asystole. A third (lower) sensitivity can also be programmed into the device to differentiate between R-waves and high amplitude current of injury T-waves which may occur post shock. Following the delivery of antitachycardia therapy in the form of either antitachycardia pacing therapy or cardioversion shock therapy, there is a pause, or post therapy pacing delay for a period of time prior to the commencement of bradycardia support pacing. The magnitude of the delay period is substantially greater than the normal bradycardia support pacing standby interval.

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Roger A. Winkle et al., "The Automatic Implantable Defibrillator: Local Ventricular Bipolar Sensing to Detect Ventricular Tachycardia and Fibrillation", The Amer. Journal of Cardiology, vol. 52, pp. 265-270 (1983).

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