Pressure and impedance based discrimination of hemodynamic stability

摘要

An implantable cardioverter defibrillator evaluates the hemodynamic stability of an arrhythmia to determine whether or not to defibrillate. The device obtains cardiac pressure and cardiac impedance data and evaluates a phase relationship between these parameters. Hemodynamically stable rhythms will result in an out of phase relationship.

主权项

1. An implantable medical device (IMD) comprising:
a microprocessor configured to control operation of the IMD; a pressure sensor coupled with the microprocessor and configured to provide a ventricular pressure signal to the microprocessor; and an impedance sensor coupled with the microprocessor and configured to provide a ventricular impedance signal to the microprocessor, wherein the microprocessor is configured to calculate a phase relationship between the ventricular pressure signal and the ventricular impedance signal and determine hemodynamic stability based upon a comparison of the calculated phase relationship to a predetermined out of phase relationship between the ventricular pressure signal and the ventricular impedance signal corresponding to a sinus rhythm.