TNNT2 and congestive heart failure: miR: microRNA; qRT: Quantitative real time; PCR: Polymerase chain reaction; CTnI: Cardiac troponin I; CK-MB: Creatine kinase-muscle/brain; CTnT: Cardiac Troponin T; NSTEMI: Non ST elevation myocardial infarction; STEMI: ST elevation myocardial infarction; hsTnT: High sensitive troponin T; EF: Ejection fraction; RT-PCR: Real time polymerase chain reaction; CHF: Congestive heart failure; CTR: Control; AMI: Acute myocardial infarction; UA: Unstable angina