Recognizing ventricular tachycardia condition using dual chamber

Details Recognizing ventricular tachycardia condition using dual chamber Recognizing ventricular tachycardia condition using dual chamber

1998-05-06

1999-11-02

Kamm, William E.

Surgery

Diagnostic testing

Cardiovascular

A61B 50464

Patent

active

059787007

ABSTRACT:
An apparatus for detecting ventricular tachycardia includes a first and snd calculation unit, each having an input side connected to a ventricle sensor and an atrium sensor, respectively, and to a timer, for calculating the R--R and P--P intervals between respective successive electrical activities in the atrium and in the ventricle. A threshold value memory stores at least one threshold value for the R--R intervals in memory. A first comparator unit compares the R--R intervals with the at least one threshold value. A first and second interval memory store a predetermined number of calculated R--R and P--P intervals, respectively, or mean R--R and mean P--P interval values. A second comparator unit compares the P--P intervals with the R--R intervals. A third and fourth calculation unit, connected to the output of the first and second calculation unit and/or of the first and second interval memory unit, respectively, calculate the change over time between successive P--P and R--R intervals. First and second criterion memories stores predetermined stability criterion for the change over time between successive P--P and R--R intervals, respectively. A third and fourth comparator unit compare the calculated change over time in the P--P and R--R intervals with the associated stability criterion stored in memory.

REFERENCES:
patent: 4860749 (1989-08-01), Lehmann
patent: 5002052 (1991-03-01), Haluska
patent: 5107850 (1992-04-01), Olive
patent: 5205283 (1993-04-01), Olson
patent: 5325856 (1994-07-01), Nitzsche et al.

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