Page 168 - YORAM RUDY BOOK FINAL

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Figure 5.27. ECGI imaged propagation patterns, origins, and local EGMs for VT. Isochrone maps
for six patients, with earliest epicardial activation marked with an asterisk. (Top) Focal propagation
patterns demonstrate a radial spread (white arrows) away from the early activation site (asterisk).
Yellow arrows indicate later phases of ventricular activation. (Bottom) Reentrant propagation
sequences show a rotational activation pattern (white arrows). Thick black lines indicate
conduction block. Purple arrows indicate later phases of ventricular activation. (Insets) Several
epicardial EGMs from sites of earliest activation are shown in blue, highlighting the presence or
absence of r wave. Pure Q morphology indicates epicardial origin; rS morphology indicates
intramural origin. From Wang et. al. [329] with permission of The American Association for the
Advancement of Science.