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Apparatus and method for arrhythmia detection by variations in the transcardiac impedance between defibrillation patches

  • US 5,179,946 A
  • Filed: 11/26/1990
  • Issued: 01/19/1993
  • Est. Priority Date: 12/28/1989
  • Status: Expired due to Term
First Claim
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1. Apparatus for measuring the haemodynamic condition of a patient'"'"'s heart, comprising:

  • at least two cardioversion/defibrillation electrodes adapted to be positioned on the outer surface of the ventricles of the patient'"'"'s heart generally across the short axis of said ventricles whereby at least the major portion of one of said electrodes is positioned on the left ventricular free wall;

    means coupled to said electrodes for sensing normal variations in the transcardiac impedance between said electrodes and determining the magnitude thereof;

    means for determining changes in the magnitude of the pulsations of said normal variations of said transcardiac impedance; and

    means responsive to said pulsation magnitude changes in normal variations of said transcardiac impedance for providing signals indicative of changes in the haemodynamic condition of the patient'"'"'s heart.

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