Takahashi T, et al. - Researchers focused on the predictive aspects in patients with biventricular heart who underwent Fontan surgery, presuming that interventricular dyssynchrony assessed by cardiac magnetic resonance imaging (MRI) in this patient populace can serve as a predictor of future cardiac events. Study participants were consecutive patients with biventricular Fontan circulation who were prospectively enrolled from 2003 to 2016 and on whom protocolized cardiac MRI was performed. Findings revealed that future cardiac events in Fontan patients with biventricular hearts could be predicted by stroke volume ratio derived from MRI.