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Background The aim of this study was to investigate the effect and mechanism of bone marrow mesenchymal stem cells (BMSCs) on the electrophysiological characteristics of hypertrophic cardiomyocytes and hypoxia-reoxygenation cardiomyocytes in rats.Methods (1) Neonatal rat ventricular myocytes (NRVMs) isolated from the hearts of neonatal SD rats (1-3 days old).