Inclusion criteria:  acute kidney injury and convalescence (GFR > 45 ml/min/1.73m²). patients who are 18 years of age or older  Exclusion criteria:  underlying cardiac disease, e.g. known myocardial infarction, previous myocarditis, congenital heart disease, cardiomyopathies of other causes known underlying disease wit potential cardiac involvement, e.g. storage disease (e.g. hemochromatosis, Fabry disease), inflammatory (e.g. sarcoidosis), endocrinological (e.g. diabetes mellitus, hyper-/hypothyroidism), autoimmune (e.g. systemic lupus erythematosus, dermatomyositis, rheumatoid arthritis), therapeutic (chemotherapy). patients with persistent renal failure and GFR < 45 ml/min/1.73m² allergy to contrast media patients who are using a intrauterinpessare for contraception pregnant and breastfeeding women patients with contraindications for MRI due to implants