Abstract: The invention relates to microRNAs (miRNAs) for the diagnosis, prophylaxis and/or treatment of heart diseases. It relates in particular to SEQ ID No: 1 to SEQ ID No: 29 for the diagnosis, prophylaxis and/or treatment of heart diseases. In addition, the invention relates to the use of these sequences to produce a medicament for heart diseases and for the diagnosis thereof. Also encompassed are a method for the diagnosis of a heart disease, a kit and an expression vector comprising these sequences, a cell which contains the expression vector, and also a method for modulating a heart disease and a method for screening a pharmaceutically active compound for the treatment and/or prophylaxis of a heart disease.