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Reentry initiation via trigger (premature ventricular complex [PVC]) and substrate interactions. Schematic diagrams showing a PVC (*) inducing anatomic reentry using a myocardial channel (m) embedded in a scar (s) (gray shading) via two mechanisms: delayed repolarization mediated unidirectional conduction block (left) and narrow exit (source-sink mismatch) mediated unidirectional conduction block (right). Image modified from ref(Qu et al., 2022).
