Acute respiratory distress syndrome was a frequent syndrome in this cohort. Sepsis was its leading cause, and pneumonia was the most common single diagnosis. Mortality was high but similar to most recent series that included serious comorbidities. Independent predictors of death 72 hrs after admission emphasize the importance of both extrapulmonary and pulmonary factors together with preexisting severe illnesses.

Colistin appears to be as safe and as effective as other antimicrobials for treatment of sepsis caused by Acinetobacter and Pseudomonas in critically ill patients.

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The use of PEEP improved oxygenation such that one-half of patients after 6 h, and most after 24 h did not fulfill AECC hypoxemia criteria of ARDS. However, LIS remained stable in the overall series. These results suggest that PEEP level should be taken into consideration for ARDS diagnosis.

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