• Luana Petruccio Cabral Monteiro Guedes, Fabrício Costa Delfino, Flavia Perassa de Faria, Gislane Ferreira de Melo, and Gustavo de Azevedo Carvalho.
• Einstein (Sao Paulo). 2013 Dec 1; 11 (4): 467-71.

ObjectiveTo compare ideal PaO2 with PaO2 found, ideal PaO2/FiO2 of room air with the one found, and ideal FiO2 with FiO2 found in mechanically ventilated elderly patients.MethodsCross-sectional study that evaluated elderly mechanically ventilated patients for at least 72 hours and who underwent three subsequent blood gas analyses.ResultsThe sample consisted of 48 elderly with mean age of 74.77±9.36 years. There was a significant difference between the ideal PaO2 and the one found (p<0.001), between FiO2 corrected and the offered one, and also between ideal PaO2/FiO2 of room air and the PaO2/FiO2 found (p<0,001).ConclusionA significant increase was seen in PaO2 and FiO2 and in alterations of gas exchange by PaO2/FiO2 index than those found in normal parameters.

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