Doppler Ultrasound Renal Arterial Resistive Indices As Predictor Of Multiorgan Failure In Patients With Acute Hypoxic Respiratory Failure Admitted To Respiratory Intensive Care Unit (Cryptic Shock Index- RICU)

Patients with de novo respiratory failure undergoing non invasive ventilation (NIV) present failure rates of mechanical ventilation ranging from 4 to 50%. Causes for NIV treatment failure are various but the onset of septic shock and subsequent multi-organ failure (MOF) seem play a critical role. Recent data show that the 37% of patients admitted to intensive care unit for de novo respiratory failure without any other organ failure experience multiple organ failure within the first days from admission. Early identification of hypoxic patients at major risk for MOF seems critical. Physiological studies have demonstrated that the underlying mechanisms for organ damage preceding MOF are those involved in the oxygen consumption (VO2)/oxygen delivery (DO2) mismatch. Doppler ultrasound indices of renal arteria resistance are directly correlated tot he VO2/DO2 mismatch. With this study we aim at investigating the correlation between Doppler ultrasound indices of renal arteria resistance in patients with de novo respiratory failure admitted to ICU and the onset of MOF within the first 7 days form admission.