Intracardiac electrogram sensing in an arrhythmia control system

Details Intracardiac electrogram sensing in an arrhythmia control system Intracardiac electrogram sensing in an arrhythmia control system

1994-10-25

1996-02-20

Kamm, William E.

Surgery

Truss

Pad

A61B 504

Patent

active

054921287

ABSTRACT:
An implantable cardioverter/defibrillator device having an improved sensing system for automatically and rapidly adjusting to changing amplitudes of intracardiac electrogram "ICEG" signals during transitions between normal sinus rhythm and ventricular tachycardia/ventricular fibrillation of a patient's heart is disclosed. ICEG signals are sensed, amplified and filtered to remove high frequency and low frequency noise and artifacts therefrom. Crossings of positive and negative threshold levels by the filtered signals are detected and corresponding positive and negative output signals representative thereof are provided. The positive and negative threshold levels are varied in accordance with corresponding variations of fractions of the levels of the filtered signals so that the positive and negative threshold levels move independently of one another in response to changes in the levels of the filtered signals; and, the positive and negative output signals generated during each heart beat are rationalized so that only one output signal is provided per heart beat.

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