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Physiologic and Clinical Studies in Poliomyelitis, Bronchial Asthma, Pulmonary Emphysema, and Bronchiectasis

ALVAN L. BARACH, M.D.; GUSTAV J. BECK, M.D.

AMA Arch Intern Med. 1954;93(6):825-841.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

OF THE various physical methods developed for eliminating bronchial secretions,* exsufflation with negative pressure (E. W. N. P.) was recently reported as the most effective. The principle of E. W. N. P. depends on (1) gradual inflation of the lungs by a positive pressure of 30 to 40 mm. Hg; (2) a swift withdrawal of air from the fully expanded lungs at the beginning of expiration, utilizing a sudden pressure drop to 30 to 40 mm. Hg below the atmosphere; (3) explosive decompression produced by a 60 to 80 mm. Hg decrease in pressure in 0.02 seconds. The latter pressure drop would result in an instantaneous intrathoracic gas expansion of approximately 10% of the total lung capacity, or 400 to 500 cc. of air, if the suction blower provided an air velocity of this magnitude. E. W. N. P., therefore, includes effects of the two methods of mechanically eliminating bronchial . . . [Full Text PDF of this Article]

Author Affiliations
With the Technical Assistance of Manus Spanier, B.S. NEW YORK

From the Department of Medicine, Presbyterian Hospital, and the College of Physicians and Surgeons, Columbia University.

Footnotes
This study was supported by The National Foundation for Infantile Paralysis.

References 1-5. References 5 and 6. References 2 and 7.

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