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Bronchopulmonary Dysplasia Criteria: A Mathematical Impossibility
Journal article   Peer reviewed

Bronchopulmonary Dysplasia Criteria: A Mathematical Impossibility

Roy E. Schwartz, STEPHEN A. Stayer and CAROLINE A. Pasquariello
Pediatrics (Evanston), v 90(5), pp 783-783
01 Nov 1992
PMID: 1408564

Abstract

To the Editor.— In the commentary "Bronchopulmonary Dysplasia: Twenty-five Years Later,"1 Dr Northway cited the diagnostic criteria for bronchopulmonary dysplasia. One of the criteria stated was a requirement for supplemental oxygen longer than 28 days of age to maintain a Pao2 above 500 mm Hg. Clearly, this was a misprint but it is important to realize why a Pao2 above 500 mm Hg in 21% oxygen at sea level is unachievable. The alveolar air equation is as follows: Pao2 = (Pb - Ph2o)Fio2 - Paco2/.8

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