A hypothesis relating breathing pattern to some forms of the "adult respiratory distress syndrome".

Quantitative deficiency of surfactant in neonates results in hyaline membrane disease. Although surfactant is also required for normal gas exchange in adults, no disorders have been clearly attributable to a deficient amount of surfactant. Based on studies in our laboratories as well as on information and ideas in the literature, we suggest that a physical alteration in surfactant may lead to, or contribute to, the development of some forms of "adult" respiratory distress syndrome." In particular, we suggest that an altered breathing pattern contributes to the alveolar collapse and liver-like appearance of the lung found in certain clinical entities, i.e., pulmonary embolism and oxygen toxicity. We hypothesize that in these conditions shallow breathing leads to the aggregation of surfactant into a less functional form resulting in increased alveolar surface tension and atelectasis. The increase in surface tension would also contribute to the edema found in these conditions.