Three-dimensional electrogram in spherical coordinates: application to ischemia analysis.
Three-dimensional electrogram was used for analysis of ischemia manifestation in isolated hearts. Three parameters based on spherical coordination system were used in this study - amplitude of electrical heart vector, its azimuth and elevation. The parameters were presented as a trend. This approach reflected ischemic changes in a manner which can be easily observed and evaluated. Ischemia was analysed in seven isolated hearts of New Zealand white rabbits. It was found that (a) ischemia changes heart electric vector, (b) ischemic preconditioning has a protective effect, and (c) both of these findings can be clearly observed by the proposed method.
Janousek
O
O
Department of Biomedical Engineering, Faculty of Electrical Engineering and Communication, Brno University of Technology, Brno, Czech Republic. xjanou12@stud.feec.vutbr.cz
Kolářová
J
J
Nováková
M
M
Provazník
I
I
D000200:Action Potentials; D000818:Animals; D004195:Disease Models, Animal; D022062:Electrophysiologic Techniques, Cardiac; D007090:Image Interpretation, Computer-Assisted; D021621:Imaging, Three-Dimensional; D019157:Ischemic Preconditioning, Myocardial; D008955:Models, Cardiovascular; D017202:Myocardial Ischemia / Q000175:diagnosis* / Q000517:prevention & control; D011237:Predictive Value of Tests; D011817:Rabbits; D014672:Vectorcardiography