Automated analysis of the 12-lead electrocardiogram to identify the exit site of postinfarction ventricular tachycardia
Journal
Heart Rhythm
Journal Volume
9
Journal Issue
3
Date Issued
2012-03-01
Author(s)
Yokokawa, Miki
Yoshida, Kentaro
Scott, Clayton
Hero, Alfred
Good, Eric
Morady, Fred
Bogun, Frank
Abstract
Background: The value of the 12-lead electrocardiogram (ECG) to identify the exit site of postinfarction ventricular tachycardia (VT) has been questioned. The purpose of this study was to assess the accuracy of a computerized algorithm for identifying a VT exit site on the basis of the 12-lead ECG. Methods and Results: In 34 postinfarction patients, pace mapping was performed from within scar tissue. A computerized algorithm that used a supervised learning method (support vector machine) received the digitized pace-map morphologies combined with the pacing sites as training data. No other information (ie, infarct localization, bundle branch block morphology, axis, or R-wave pattern) was used in the algorithm. The training data were validated in 58 VTs in 33 patients. The sizes of 10 different anatomic sections within the heart were determined by using the pace maps as the determining factor. Accuracy was found to be 69% for pace maps, and when 2 adjacent regions were combined, accuracy improved to 88%. Validation of the data in 33 patients showed an accuracy of 71% for localizing a VT exit site to 1 of the 10 regions within the left ventricle. If combined with the best adjacent region, accuracy improved to 88%. The median anatomic size of each section was 21 cm2. The median spatial resolution of the 12-lead ECG pattern of the pace maps for a particular region was 15 cm2. Conclusion: The 12-lead ECG of postinfarction VT contains localizing information that enables determination of a region of interest in the 1020 cm2 range for more than 70% of VT exit sites in a given sector. © 2012 Heart Rhythm Society. Published by Elsevier Inc. All rights reserved.
Subjects
12-lead ECG | Postinfarction | VT
Type
journal article