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ECG Criteria to Identify Epicardial Ventricular Tachycardia
in Nonischemic CardiomyopathyCLINICAL PERSPECTIVE
by Ermengol Vallès, Victor Bazan, and Francis E. Marchlinski
Circ Arrhythm Electrophysiol
Volume 3(1):63-71
February 1, 2010
Copyright © American Heart Association, Inc. All rights reserved.
Figure 1. A, Left posterior oblique view of a bipolar ENDO voltage map in sinus rhythm shows
the typical distribution of low voltage (<1.5 mV) abnormalities around the mitral annulus.
Ermengol Vallès et al. Circ Arrhythm Electrophysiol.
2010;3:63-71
Copyright © American Heart Association, Inc. All rights reserved.
Figure 2. QRS from ENDO VT showing discrepancy between interval and morphology criteria.
Ermengol Vallès et al. Circ Arrhythm Electrophysiol.
2010;3:63-71
Copyright © American Heart Association, Inc. All rights reserved.
Figure 3. Schematic representation showing suggested basis for morphological differences in
QRS in lead I and aVF based on initial regional (small arrow) followed by global LV activation
(large arrows) from endocardial versus epicardial VT origin from superior-lateral LV. A, VT origin
from the endocardium shows small q waves in inferior leads and small r wave in lead I
representing the small segment of myocardium that depolarizes with an ENDO to EPI activation
before the main activation wave front proceeds from a superior to inferior and left to right
direction.
Ermengol Vallès et al. Circ Arrhythm Electrophysiol.
2010;3:63-71
Copyright © American Heart Association, Inc. All rights reserved.
Figure 4. QRS morphology and interval values for ENDO and EPI pace maps from basal superior
and lateral LV sites in patients with NICM. Each interval measurement (the 5 top variables in the
figure) was observed to be longer from the EPI than from the ENDO. However, the
sensitivity/specificity values (right box) using the reported cutoffs for interval criteria were
limited.
Ermengol Vallès et al. Circ Arrhythm Electrophysiol.
2010;3:63-71
Copyright © American Heart Association, Inc. All rights reserved.
Figure 5. Morphological features suggesting EPI versus ENDO origin during pace mapping in
basal superior and lateral LV in patients with NICM. A and B, Pace maps from superior basal and
lateral basal ENDO LV, respectively.
Ermengol Vallès et al. Circ Arrhythm Electrophysiol.
2010;3:63-71
Copyright © American Heart Association, Inc. All rights reserved.
Figure 6. QRS morphology and interval values for ENDO and EPI VT from basal superior and
lateral LV sites in patients with NICM. Only the QRSd and the SRS complex duration were
observed to be significantly longer from the EPI than from the ENDO. The rest of the interval
criteria measurements were not significantly different when comparing EPI and ENDO origin.
Ermengol Vallès et al. Circ Arrhythm Electrophysiol.
2010;3:63-71
Copyright © American Heart Association, Inc. All rights reserved.
Figure 7. Twelve-lead ECG showing characteristic morphological features of VT originating from
epicardium versus endocardium.
Ermengol Vallès et al. Circ Arrhythm Electrophysiol.
2010;3:63-71
Copyright © American Heart Association, Inc. All rights reserved.
Figure 8. Four-step algorithm for identifying EPI origin from basal superior and lateral LV in the
setting of NICM. The 3 top steps have a high specificity and the last step is the most accurate.
Ermengol Vallès et al. Circ Arrhythm Electrophysiol.
2010;3:63-71
Copyright © American Heart Association, Inc. All rights reserved.