Short-term effects of cigarette smoking on bronchial clearance in humans. 1975


The short-term effects of cigarette smoking on the bronchial clearance of inhaled monodisperse radioactive insoluble particles was studied in nine nonsmokers and six smokers. Each subject inhaled two aerosols of the same particle size, tagged with a different isotope, with an interval of several hours between aerosol exposures. Simultaneous measurements were made of the clearance of both aerosols. Smoking of from two to seven cigarettes was started shortly after the second tagged aerosol. Comparison of the bronchial clearance times of the two tagged aerosols gave a minimum estimate of a twofold transient speedup in deep bronchial clearance caused by the cigarette smoking in both smokers and nonsmokers.

UI MeSH Term Description Entries
D008297 Male Males
D009093 Mucus The viscous secretion of mucous membranes. It contains mucin, white blood cells, water, inorganic salts, and exfoliated cells.
D010316 Particle Size Relating to the size of solids. Particle Sizes,Size, Particle,Sizes, Particle
D011849 Radioactive Tracers Radioactive substances added in minute amounts to the reacting elements or compounds in a chemical process and traced through the process by appropriate detection methods, e.g., Geiger counter. Compounds containing tracers are often said to be tagged or labeled. (Hawley's Condensed Chemical Dictionary, 12th ed) Radioactive Tracer,Radionuclide Tracer,Radionuclide Tracers,Tracer, Radioactive,Tracer, Radionuclide,Tracers, Radioactive,Tracers, Radionuclide
D012123 Pulmonary Ventilation The total volume of gas inspired or expired per unit of time, usually measured in liters per minute. Respiratory Airflow,Ventilation Tests,Ventilation, Pulmonary,Expiratory Airflow,Airflow, Expiratory,Airflow, Respiratory,Test, Ventilation,Tests, Ventilation,Ventilation Test
D001980 Bronchi The larger air passages of the lungs arising from the terminal bifurcation of the TRACHEA. They include the largest two primary bronchi which branch out into secondary bronchi, and tertiary bronchi which extend into BRONCHIOLES and PULMONARY ALVEOLI. Primary Bronchi,Primary Bronchus,Secondary Bronchi,Secondary Bronchus,Tertiary Bronchi,Tertiary Bronchus,Bronchi, Primary,Bronchi, Secondary,Bronchi, Tertiary,Bronchus,Bronchus, Primary,Bronchus, Secondary,Bronchus, Tertiary
D001991 Bronchitis Inflammation of the large airways in the lung including any part of the BRONCHI, from the PRIMARY BRONCHI to the TERTIARY BRONCHI. Bronchitides
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D000336 Aerosols Colloids with a gaseous dispersing phase and either liquid (fog) or solid (smoke) dispersed phase; used in fumigation or in inhalation therapy; may contain propellant agents. Aerosol

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