The research has been divided into the following four integrated components: (1) Instrumentation - Completion of the development of """"""""State-of-the Art"""""""" Instrumentation to rapidly obtain, on-line and stand-alone at all age groups, electrocardiographic low noise body surface potential color coded maps (BSPM) utilizing 180 passive electrodes with active cables. Insuring optimal safety in obtaining BSPM simultaneous with indwelling cardiac electrode catheters. (2) Clinical Studies - four major subprojects. a) Correlations of simultaneously obtained BSPM with endocardial electrophysiological studies (EPS), with analysis of spread of activation from known positioned stimulated activation during catheterization; b) Correlations of simultaneously obtained BSPM with spread of activation from known positioned epicardial pacemakers; c) Continued development of a normal quantified data base for P, QRS, ST-T, as well as development of maximal knowledge of BSPM's on a large number of children with varying pathology. Correlations with Frank VCG plus M Mode and 2D Echo; d) Correlation of quantified BSPM's in adults with remote myocardial infarction undergoing cardiac catheterization involving coronary angiography and ventriculography, plus 12 lead simultaneous standard ECG, Frank VCG, and Positron Emission Tomography (PET). (3) Image Measurements - Investigation of optimal imaging and display of BSPM data including determination of the effects of artifacts and system bandwidth upon the measurements of map features. Develop a systematic approach to automatic measurements of the map features which encode clinical information. (4) Biophysical Studies - a) Inverse Electrocardiography Methods for reconstructing epicardial potentials from body surface potential distributions utilizing the multipole expansion approach will be developed and tested. The reconstructed epicardial maps will aid in the interpretations of BSPM's; b) Forward Problem - An interactive computer model of the electrocardiographic forward problem for realistic heart and torso geometry is being developed. The model will contain the specialized conduction tissue and will generate isochrones, epicardial potentials, and body surface potential maps (BSPM's). This model will be used to simulate BSPM's in normal and abnormal conditions and will serve as an additional tool for the interpretation of the maps.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL017931-11
Application #
3335499
Study Section
(SSS)
Project Start
1978-06-01
Project End
1987-11-30
Budget Start
1985-12-01
Budget End
1986-11-30
Support Year
11
Fiscal Year
1986
Total Cost
Indirect Cost
Name
Case Western Reserve University
Department
Type
Schools of Medicine
DUNS #
077758407
City
Cleveland
State
OH
Country
United States
Zip Code
44106
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Sun, G; Thomas, C W; Liebman, J (1990) QRS onset and offset detection accuracy improvement by additional spatial information in body surface potential maps. J Electrocardiol 23:293-300
Reich, Y; Thomas, C W; Pao, Y H et al. (1990) Multicategory classification of body surface potential maps. IEEE Trans Biomed Eng 37:945-55
Liebman, J (1990) Use of noninvasively determined right ventricular epicardial breakthrough in clinical diagnosis and understanding. J Electrocardiol 23 Suppl:63-70
Liebman, J; Thomas, C; Fraenkel, R et al. (1989) Analysis of the hypoplastic right ventricle utilizing electrocardiographic body surface potential mapping (BSPM). J Electrocardiol 22:195-209
Thomas, C W; Laurita, K; Sun, G et al. (1989) A cardiac potential mapping system. J Electrocardiol 22 Suppl:64-71
Widman, L E; Liebman, J; Thomas, C et al. (1988) Electrocardiographic body surface potential maps of the QRS and T of normal young men. Qualitative description and selected quantifications. J Electrocardiol 21:121-36
Amoore, J N; Rudy, Y; Liebman, J (1988) Respiration and the ECG: a study using body surface potential maps. J Electrocardiol 21:263-71
Messinger-Rapport, B J; Rudy, Y (1986) The inverse problem in electrocardiography: a model study of the effects of geometry and conductivity parameters on the reconstruction of epicardial potentials. IEEE Trans Biomed Eng 33:667-76
Messinger-Rapport, B J; Rudy, Y (1985) Effects of the torso boundary and internal conductivity interfaces in electrocardiography: an evaluation of the 'infinite medium' approximation. Bull Math Biol 47:685-94