Which of the following diagnostic criteria refer to acute respiratory distress syndrome and acute lung injury? I. PCWP >18 mm Hg II. unilateral infiltrates on chest radiography III. Pao2/Fio2 <200 for ARDS IV. Pao2/Fio2 <300 for ALI
A. I, III only
B. II, IV only
C. III, IV only
D, I, III, IV only
ANS: C
A. Incorrect response: See explanation C.
B. Incorrect response: See explanation C.
C. Correct response: ARDS and ALI are parenchymal lung injuries that have specific diagnostic criteria. Both have acute onset and bilateral infiltrates on chest radiography. Neither injury reflects cardiogenic edema. The PCWP will therefore be less than 18 mm Hg, and the Pao2/Fio2 ratios will be less than 200 for ARDS and less than 300 for ALI.
D. Incorrect response: See explanation C
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