A comparison of two methods for evaluating surface properties of the lung

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Abstract
Indices of the surface tension properties of fetal lamb lungs were obtained by the bubble stability method and from direct measurements of a lung extract on a Langmuir-Wilhelmy balance. A comparison of 102 determinations by each method on 31 fetal lamb lungs gave a statistically significant positive correlation coefficient. A comparison of the surface balance index with a pressure-volume deflation index and with gestation and of the bubble stability index with gestation gave statistically significant positive correlation coefficients. Storage by freezing for 21-112 days did not alter either index of surface tens ion.

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