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Objective Congestive heart failure (CHF) is the final common pathway of various heart diseases.Calcineurin,a calcium/calmodulindependent phosphatase consisting of a catalytic subanit A (CnA) and a regulatory calcium-binding subunit B (CnB),is activated in heart failure.This study aimed to investigate the relationship between mRNA level of calcineurin in circulating T-lymphocyte and that in myocardium in patients with CHF. Methods A total of 38 patients with CHF (aged from 29 to 62 years) were included in this study.The mRNA levels of alpha-and beta-isoform of CnA in left ventricular anterior papillary muscle and peripheral lymphocytes were determined by semi-quantitative reverse transcription polymerase chain reaction.Pearson linear correlation analysis was performed,and difference was considered statistically significant at a P value