The aim of this clinical prospective study is to assess structural and functional myocardial changes in patients after acute kidney injury (Cardiorenal syndrome type 3) and intensive care stay by multiparametric cardiac MRI.

The aim of the study is to demonstrate any differences in myocardial structure and function using multiparametric cardiac MRI in patients after acute kidney injury (Cardiorenal syndrome type 3) and intensive care stay and subsequent convalescence compared to a control group with intensive care stay but without kidney injury. Furthermore, the correlation between clinical disease severity and cardiac involvement will be investigated.

Inclusion criteria:

1. acute kidney injury and convalescence (GFR > 45 ml/min/1.73m²).
2. patients who are 18 years of age or older

Exclusion criteria:

1. underlying cardiac disease, e.g. known myocardial infarction, previous myocarditis, congenital heart disease, cardiomyopathies of other causes
2. 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).
3. patients with persistent renal failure and GFR < 45 ml/min/1.73m²
4. allergy to contrast media
5. patients who are using a intrauterinpessare for contraception
6. pregnant and breastfeeding women
7. patients with contraindications for MRI due to implants

Patients with convalescence after acute renal failure who were/are treated in the Department of Anesthesiology and Intensive Care Medicine of the University Hospital Bonn are included.