Optical-electrophysiology was performed as outlined previously73 (link) using a voltage sensitive FluoVolt dye (Thermo Fisher Scientific, USA), and the absolute fluorescence signals were obtained with a custom built novel high-throughput imaging platform (OptioQUANT) (Ternion Bioscience, Singapore). All data were analyzed with Igor Pro (WaveMetrics, USA). AP durations of WT and Mfn 1&2 KO mouse cardiomyocytes were measured at 30%, 50%, 70% and 90% decrement of AP amplitude and analyzed. Cells which exhibited irregular events during acquisition were excluded from analyses. All values are given as mean ± SEM.
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