Study on the Correlation Between NAT2(N-acetyltransferase2) Gene Polymorphism and CrCl(Creatine Clreance) and the Efficacy and Safety of Levosimendan in Patients With Severe Heart Failure

Exclusion Criteria

• •chronic heart failure and New York Heart Association ( NYHA ) class I \~ II
• •Complicated with infective endocarditis, aortic dissection, severe liver dysfunction ( child-pugh C ), severe renal insufficiency ( CrCl \< 30 ml / min ), hypertrophic obstructive cardiomyopathy, ventricular assist device or surgical cardiac surgery within 30 days before the use of levosimendan
• •Patients with severe ventricular arrhythmia 1 within 24 hours before levosimendan and systolic blood pressure 100 times / min within 2 hours before levosimendan
• •During hospitalization, other positive inotropic drugs 2 were used when levosimendan was intravenously pumped or dripped, excluding the use of catecholamines for rescue
• •received positive inotropic drug 2 treatment in the last 30 days
• •Lack of serum creatinine, brain natriuretic peptide or brain natriuretic peptide precursor, serum total bilirubin, cardiac ultrasound baseline ( within 14 days before using levosimendan ) data
• •pregnant and lactating women