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Impact of premature activation of the right ventricle with programmed stimulation in Brugada syndrome

In Brugada syndrome (BrS), it has been reported that delayed activation in the RV is related to the development of type‐1 ECG, which is more critical than type‐2. On the other hand, the coexistence of complete right bundle‐branch block (CRBBB), which also causes delayed activation in the RV, sometimes makes typical BrS ECG misleading. We hypothesized that premature stimulation of the RV can unmask the influence of delayed activation in the RV and convert the morphology of ECG in BrS patients.