O.sub.2 level responsive system for and method of treating a mal

Details O.sub.2 level responsive system for and method of treating a mal O.sub.2 level responsive system for and method of treating a mal

1989-05-04

1990-11-06

Jaworski, Francis

Surgery

Truss

Pad

128419PG, A61N 100

Patent

active

049677489

ABSTRACT:
A system for and method of treating a malfunctioning heart is based on hemodynamics, the O.sub.2 in blood at a site in a patient's circulatory system being sensed. A signal is developed representative of short term O.sub.2 level in the blood at the sites preferably at a site (right ventricle or a pulmonary artery) which carries mixed venous blood. A signal representative of a baseline O.sub.2 level (fixed or varying) is provided and if the short term current O.sub.2 level differs therefrom by a predetermined value, an indication of possible hemodynamic compromise, cardioversion/-defibrillation is effected. In a second embodiment, the determination of whether the difference between fixed or varying baseline O.sub.2 level or current O.sub.2 level is undertaken after a rate criteria (for example a heart rate above 155 b.p.m.) has been met. In a third embodiment, the rate and O.sub.2 level criteria both must exist at the same time, before cardioverting/-defibrillation is initiated. In a fourth embodiment, a microprocessor is used. The system may be integrated with antitachycardia and/or antibradycardia pacemakers.

REFERENCES:
patent: 4467807 (1984-08-01), Bornzin
patent: 4730389 (1988-03-01), Baudino et al.
patent: 4763655 (1988-08-01), Wirtzfeld et al.
patent: 4803987 (1989-02-01), Calfee et al.
patent: 4999820 (1983-08-01), Wirtzfeld et al.

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