Tracheobronchial particle deposition and clearance. A study of the effects of cigarette smoking in monozygotic twins.


Journal Article

Particle deposition and tracheobronchial clearance were measured in six pairs of male monozygotic twins, four of which were discordant for cigarette smoking. The fraction of an inhaled aerosol that deposited on the ciliated airways showed variations within twin pairs comparable with variations in repeated tests on a single subject, and significantly smaller (P less than .001) than among tests on different subjects. Variations that did occur were consistent with differences in forced expiratory volume (FEV1.0) values. The proximal shift of aerosol deposition and reduced FEV1.0 values in smokers indicated that they had some degree of bronchoconstriction. Mucociliary clearance characteristics are qualitatively and quantitatively similar for nonsmoking and smoking concordant monozygotic twins, ie, comparable with repeated tests on a single individual, reflecting their constitutional similarity. With one exception, clearance curves for twin pairs discordant with respect to smoking were also qualitatively indistinguishable. Nonsmokers, however, had greater upper bronchial clearance rates than their smoking twins.

Full Text

Cited Authors

  • Bohning, DE; Albert, RE; Lippmann, M; Foster, WM

Published Date

  • September 1, 1975

Published In

Volume / Issue

  • 30 / 9

Start / End Page

  • 457 - 462

PubMed ID

  • 1172413

Pubmed Central ID

  • 1172413

Electronic International Standard Serial Number (EISSN)

  • 2331-4303

International Standard Serial Number (ISSN)

  • 0003-9896

Digital Object Identifier (DOI)

  • 10.1080/00039896.1975.10666750


  • eng