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Figure 1 Photographs of the Interventricular Septum in a Patient Who Developed New Atrioventricular Block After Transcatheter Aortic Valve Implantation

(A) Photograph showing macroscopically visible myocardial injury. (B) Photomicrographs of the upper interventricular septum showing myocardial necrosis of the leftward portion of the septum. The arrowheads delineate the rightward extent of myocardial injury. (C) Higher magnification (boxed area in B) shows necrotic cardiac myocytes (arrow) in contradistinction to viable cardiac myocytes (asterisk). (D) Photomicrograph of the upper interventricular septum from a patient who did not develop atrioventricular block showing no myocardial necrosis. Trichrome stain: B, C and D.