This analysis and report was approved by the Institutional Medical Ethical Committee. Clinical and laboratorial data at admission and during ICU stay are described, including the management of respiratory support and nonventilatory strategies. Data for the Simplified Acute Physiology Score II (SAPS II) and for the Acute Physiology And Chronic Health Evaluation (APACHE II) were reported as the worst value within 24 h after ICU admission. A daily evaluation of organ function according to the Sequential Organ Failure Assessment (SOFA) score was performed Radiological findings were evaluated through X-ray in all patients and computerized tomography when appropriate.