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June 18, 1938


JAMA. 1938;110(25):2085-2086. doi:10.1001/jama.1938.02790250045015

Before the twentieth annual meeting of the American Association for Thoracic Surgery at Saranac Lake, N. Y., last year, Jacobæus1 of Stockholm presented a bronchoscopic method for determining the size and function of the lung. The method enables determination of the vital capacity, the reserve air and the residual air of each lung. The oxygen intake and the carbon dioxide output may be determined for a unit of time. Earlier attempts to separate the respired air from each lung were concerned chiefly with animal experiments and were based on the principle advanced by Pflüger in 1870. In his technic a catheter, supplied with a distensible rubber cuff at its distal end, was passed into each of the two main bronchi. The experiment called for a performance of a preliminary tracheotomy and the introduction of cannulas, the breathing being recorded on separate spirometers. For obvious reasons this experiment was not