Mean Arterial Pressure (MAP) and Renal Perfusion: Evaluation of Critically Ill Patients With Normal Creatinine or Reduced Renal Function

Inclusion Criteria: * Over 18 years old * Intensive care patient * Treated with vasopressor * Given informed consent * Arterial infusion * A bladder catheter Exclusion Criteria: * Anamneses of hypertension * Neurological trauma * Acute renal insufficiency other than prerenal or acute tubular necrosis etiology * Hepatorenal syndrome * Treated with diuretics * Mechanical ventilation and unstable