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A: The site of origin of a premature ventricular complex (PVC) from the posteromedial papillary muscle (PAP). During sinus rhythm, a Purkinje potential (arrow) is present 8 ms before the onset of QRS complex. A Purkinje potential (arrow) precedes the QRS complex of the PVC by 26 ms.
B: Matching pace-map at the site of origin of the PVC in the posteromedial papillary muscle.
