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Comprehensive functioning of Ca 2+  cycling is crucial for excitation–contraction coupling of cardiomyocytes (CMs). Abnormal Ca 2+  cycling is linked to arrhythmogenesis, which is associated with cardiac disorders and heart failure. Accordingly, we have generated spontaneously beating CMs from induced pluripotent stem cells (iPSC) derived from patients with catecholaminergic polymorphic ventricular tachycardia (CPVT), which is an inherited and severe cardiac disease. Ca 2+  cycling studies have revealed substantial abnormalities in these CMs. Ca 2+  transient analysis performed manually lacks accepted analysis criteria, and has both low throughput and high variability. To overcome these issues, we have developed a software tool,  AnomalyExplorer  based on interactive visualization, to assist in the classification of Ca 2+  transient patterns detected in CMs. Here, we demonstrate the usability and capability of the software, and we also compare the analysis efficiency to manual analysis. We show that  AnomalyExplorer  is suitable for detecting normal and abnormal Ca 2+  transients; furthermore, this method provides more defined and consistent information regarding the Ca 2+  abnormality patterns and cell line specific differences when compared to manual analysis. This tool will facilitate and speed up the analysis of CM Ca 2+  transients, making it both more accurate and user-independent.  AnomalyExplorer  can be exploited in Ca 2+  cycling analysis to study basic disease pathology and the effects of different drugs.

Novel Analysis Software for Detecting and Classifying Ca2+ Transient Abnormalities in Stem Cell-Derived Cardiomyocytes