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The mechanical properties of the lungs were measured in the sitting and supine positions in 5 normal subjects and in 5 patients with orthopnea due to congestive heart failure. The patients had higher elastic and viscous resistances in the sitting position. Recumbency increased both resistances in both groups but there was a disproportionate increase in the viscous resistance of the patients. This increase was most marked in late expiration and early inspiration. The significance of these findings to orthopnea is discussed.

Significance of Pulmonary Elastic and Viscous Resistance in Orthopnea