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Objective: NCX exists in three isoforms: NCX1, NCX2, NCX3, NCX1 are expressed abundantly in heart.NCX1 exports one Ca2+ ion for the uptake of three Na+ ions.NCX1 extrudes calcium ion after contraction and helps the cardiomyocyte to diastole.NCX1 plays a crucial role in atrial fibrillation during calcium overload.This aim of this study was to measure the mRNA expression levels of NCX1.