Impact of a Treatment With Angiotensin Receptor Blocker on Outcome After Acute Kidney Injury in Patients Discharged From the ICU.

Inclusion Criteria: * Patient between 18 and 75 years old * Met criteria for acute kidney injury during the ICU stay (according to the KDIGO criteria) * After their renal function has stabilized for at least 48 hours (Serum creatinine decreasing or not increasing more than 26 micromol/L or 25%) among patients ready to be discharged from the ICU or acute careTCU. and within 30 days after their ICU discharge. * Signed informed consent * Patients affiliated to a Social Security System * Women of childbearing potential and men must agree, to use adequate and highly effective contraception, until the end of the research. Exclusion Criteria: * Patient treated with ACEi or ARB before ICU admission * Patient for whom treatment with ACEi or ARB is strongly recommended according to the international guidelines at discharge (i.e. patients with congestive heart failure and persistent dyspnea with LVEF\<40%,, patients with diabetes mellitus and either albuminuria \> 300 µg/g creatininuria or hypertension associated with microalbuminuria or hypertension associated with eGFR \< 60 ml/min) known before ICU admission. * Hyperkalemia\>5 mmol/L * Systolic blood pressure \<100 mmHg * Patient with severe renal failure, as defined by estimated glomerular filtration rate creatinine clearance \< 15 ml/min/1.73m2), requiring renal replacement therapy at ICU discharge * Oral route impossible. * Pregnancy * Breast feeding * Patients chronically treated with Aliskiren * Known hypersensitivity to the active substance or to one of its excipients and in particular to lactose * Patients with known primary hyperaldosteronism * Patients with known severe and symptomatic aortic stenosis, mitral stenosis or obstructive hypertrophic cardiomyopathy. * Patients treated with lithium * Patient undergoing psychiatric care * Inability to consent due to psychiatric disorders defined as psychiatric disorders or patient with a mental state requiring immediate care with either by constant medical surveillance justifying hospitalization, or regular medical follow-up justifying specific treatment * Patient deprived of liberty by a judicial or administrative decision * Patient to a legal protection measure (guardianship, curatorship and safeguard of justice)