THE PULMONARY RETENTION OF AEROSOLS: A QUANTITATIVE METHOD OF MEASUREMENT USING SODIUM PARA-AMINO HIPPURATE

Abstract
The use of this substance permits detn. of the amt. of aerosol retained by: (1) the difference between the amt. inspired and that expired and trapped in the mouth; and (2) by the amt. which is absorbed and appears in the urine. The first requires a cumbersome apparatus; the second, collection of urine over a period of 6-12 hrs. The methods check each other well, and in either case could readily be modified for study of the pulmonary retention of other substances given as aerosols by incorporating Na p-aminohippurate in the soln. to be nebulized.