Impact of positive end-expiratory pressure on the definition of acute respiratory distress syndrome |
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Authors: | Estenssoro Elisa Dubin Arnaldo Laffaire Enrique Canales Héctor S Sáenz Gabriela Moseinco Miriam Bachetti Pierina |
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Institution: | (1) Servicio de Terapia Intensiva, Hospital Interzonal General de Agudos General San Martín, 1900 la Plata, Argentina;(2) Servicio de Terapia Intensiva, Clínica Bazterrica, Buenos Aires, Argentina |
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Abstract: | Objective We examined whether PEEP during the first hours of ARDS can induce such a change in oxygenation that could mask fulfillment of the AECC criteria of a PaO2/FIO2 200 essential for ARDS diagnosis.Design and setting Observational, prospective cohort in two medical-surgical ICU in teaching hospitals.Patients 48 consecutive patients who met AECC criteria of ARDS on 0 PEEP (ZEEP) at the moment of diagnosis.Measurements and results PaO2/FIO2 and lung mechanics were recorded on admission (0 h) to the ICU on ZEEP, and after 6, 12, and 24 h on PEEP levels selected by attending physicians. Lung Injury Score (LIS) was calculated at 0 and 24 h. PaO2/FIO2 rose significantly from 121±45 on ZEEP at 0 h, to 234±85 on PEEP of 12.8±3.7 cmH2O after 24 h. LIS did not change significantly (2.34±0.53 vs. 2.42±0.62). These variables behaved similarly in pulmonary and extrapulmonary ARDS, and in survivors and nonsurvivors. After 24 h only 18 patients (38%) still had a PaO2/FIO2 of 200 or lower. Their mortality was similar to that in the remaining patients (61% vs. 53%).Conclusions 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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Keywords: | Acute lung injury Acute respiratory distress syndrome Hypoxemia Diagnosis Positive end-expiratory pressure Mechanical ventilation |
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