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CVRTICVRTI Epicardial Mapping from Intracoronary Catheters Rob MacLeod, Richard Kuenzler, Quan Ni, Bruno Taccardi, and Bob Lux NEH Cardiovascular Research and Training Institute (CVRTI), U of Utah
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CVRTICVRTI Cardiac Mapping Coverage Surface or volume Sampling Density
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CVRTICVRTI Catheter Mapping Epicardial Endocardial Venous
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CVRTICVRTI The Questions What are catheter electrograms? Can they provide mapping data?
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CVRTICVRTI Catheter Measurements Acute dog preparation Cardima 4-16 pole catheters High resolution epicardial plaque
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CVRTICVRTI Electrogram Comparison Catheter Epi 1 Epi 2 -10 -20 -30 -40 V [mV] 10 20 0
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CVRTICVRTI Statistical Comparison
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CVRTICVRTI Interpolation Original Hardy’sLaplacian 42 electrodes
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CVRTICVRTI Interpolation Original Hardy’sLaplacian 42 electrodes
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CVRTICVRTI Estimation Matrix Statistical Estimation Covariance Matrix Training Data * Sub-sampled Data = Estimate
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CVRTICVRTI Interpolation vs. Estimation Original Hardy’sLaplacian Statistical Estimation
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CVRTICVRTI Interpolation vs. Estimation Original Hardy’sLaplacian Statistical Estimation
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CVRTICVRTI Electrode Spacing OriginalEstimated: 41 leads (4 mm spacing) Estimated: 21 leads (8 mm spacing)
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CVRTICVRTI Test Geometry Coronary Circulation Surrogate Catheters GCV CS MCV LVP
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CVRTICVRTI Resubstitution Protocol Training Data Experiment 1 Experiment 2 Experiment 3 Experiment 4 Test Data Indicator of database quality
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CVRTICVRTI Leave-One-Map-Out Protocol Training Data Experiment 1 Experiment 2 Experiment 3 Experiment 4 Test Data Intermittent bad lead case
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CVRTICVRTI Leave-One-Experiment-Out Protocol Training Data Experiment 1 Experiment 2 Experiment 4 Test Data Experiment 3 Clinically relevant case
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CVRTICVRTI Training Protocols Resubstitution –test data included in training –sets the standard for a given database Leave one map out –test data from same experiment as training –the intermittent bad lead case Leave one experiment out –test data from different experiment –clinically most relevant condition
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CVRTICVRTI OriginalResubstitution Leave Out One Map Leave Out One Experiment LV Pacing
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CVRTICVRTI Anterior Pacing OriginalResubstitution Leave Out One Map Leave Out One Experiment
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CVRTICVRTI Apical Pacing OriginalResubstitution Leave Out One Map Leave Out One Experiment
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CVRTICVRTI Apical Pacing OriginalResubstitution Leave Out One Map Leave Out One Experiment
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CVRTICVRTI Posterior Pacing OriginalResubstitution Leave Out One Map Leave Out One Experiment
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CVRTICVRTI Posterior Pacing OriginalResubstitution Leave Out One Map Leave Out One Experiment
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CVRTICVRTI Effect of # of Leads L-experiment L-map Resubstitution 510152025303540 # Catheter Leads Relative Error Mean Std. Dev. leads evenly spaced N=153 maps
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CVRTICVRTI Highlight infarct case Database included normal hearts Test set from infarcted heart
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CVRTICVRTI Current Research Acquire larger database –Variety of activation sequences –Range of interventions Evaluate other estimation approaches Evaluate other basis functions Merge estimation with interpolation
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