System and methods for matching electrical characteristics and propagation velocities in cardiac tissue
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United States of America Patent
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Jan 23, 1996
Grant Date -
N/A
app pub date -
Jan 31, 1994
filing date -
Jan 31, 1994
priority date (Note) -
Expired
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Abstract
Systems and methods examine heart tissue morphology using three or more spaced apart electrodes, at least two of which are located within the heart in contact with endocardial tissue. The systems and methods transmit electrical current through a region of heart tissue lying between selected pairs of the electrodes, at least one of the electrodes in each pair being located within the heart. The systems and methods derive the electrical characteristic of tissue lying between the electrode pairs based, at least in part, upon sensing tissue impedances. The systems and methods also sense the timing of local depolarization events in the tissue in which impedance is sensed and derive therefrom the propagation velocities of the sensed depolarization events. The systems and methods match the derived tissue electrical characteristics with the derived propagation velocities in spatial relation to the electrodes to characterize the morphology of the contacted heart tissue. This matching provides precise differentiation between regions of infarcted heart tissue and healthy heart tissue.
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