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System and methods for matching electrical characteristics and propagation velocities in cardiac tissue

  • US 5,485,849 A
  • Filed: 01/31/1994
  • Issued: 01/23/1996
  • Est. Priority Date: 01/31/1994
  • Status: Expired due to Fees
First Claim
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1. A system for examining heart tissue comprisingat least three spaced apart electrodes,locating means for positioning at least two of the electrodes in contact with a heart tissue region,first means for transmitting electrical current in a first path through the heart tissue region between a first pair of the electrodes, for transmitting electrical current in a second path through the heart tissue region between a second pair of the electrodes, and for deriving therefrom tissue electrical characteristics based, at least in part, upon sensing impedances of tissue lying in the first and second paths,second means for sensing timing of local depolarization events in the tissue in which impedance is sensed and for deriving therefrom propagation velocities of the sensed depolarization events, andthird means for matching derived tissue electrical characteristics with derived propagation velocities in spatial relation to the electrodes to characterize morphology of heart tissue in the heart tissue region.

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