Abstract:Objective To investigate the serum level of miR-1 in patients with acute heart failure and its relationship with cardiac function and prognosis. Methods Totally 120 patients with acute heart failure were selected as the heart failure group, and 120 healthy patients were selected as the control group (group C) from January 2015 to December 2018. The serum miR-1 level was determined by reverse transcription-polymerase chain reaction (RTPCR). Color doppler echocardiography was used to determine the left atrium diameter (LAD), left ventricular enddiastolic diameter (LVEd) of patients and the left ventricular ejection fraction (LVEF) were calculated. Results The serum miR-1 level and LVEF relative level in the heart failure group were lower than those in the C group (P < 0.05), and LAD level and LVEd level were higher than those in the C group (P < 0.05). Comparison of serum miR-1 levels in patients with different severity heart failure, and the differences were statistically significant (P < 0.05), the serum miR-1 levels decreased with the improvement of heart failure severity. The serum miR-1 levels in the poor prognosis group were lower than those in the good prognosis group (P < 0.05). The serum miR-1 levels in patients with heart failure were positively correlated with LVEF (r = 0.578, P < 0.05), and negatively correlated with LAD (r = -0.442) and LVEd (r = -0.473) (P < 0.05). Logistic regression analysis of prognostic influencing factors in patients with heart failure showed that miR-1 level [Ol^R = 4.152 (95% CI: 1.846, 5.384)], LVEF [Ol^R = 2.971 (95% CI: 1.764, 4.037)], LAD [Ol^R = 0.706 (95% CI: 0.415, 0.923)] and LVEd (Ol^R = 0.721 (95% CI: 0.427, 0.928)] were all independent influencing factors of prognosis in heart failure. Conclusions The level of serum miR-1 in patients with heart failure is reduced, and its level is closely related to cardiac function and prognosis, which is an independent factor affecting the poor prognosis of heart failure.