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An experimental study of clearance of inhaled particles from the human nose.
MedLine Citation:
PMID:  21142810     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
ABSTRACT Retention in the extrathoracic airways, and clearance by nose blowing, of monodisperse indium-111-labeled polystyrene particles were followed for at least 2 days after inhalation by healthy volunteers. Nine volunteers inhaled 3-μm aerodynamic diameter particles while sitting at rest, whereas subgroups of 3 or 4 inhaled 1.5-μm or 6-μm particles at rest, and 3-μm or 6-μm particles while performing light exercise. Retention of the initial extrathoracic deposit (IETD) in the extrathoracic airways was described by 4 components: on average 19% IETD cleared by nose blowing; 15% was swallowed before the first measurement, a few minutes after inhalation; 21% cleared by mucociliary action between the first measurement and about an hour later; and 45% subsequently cleared by mucociliary action. Geometric mean times in which 50% and 90% of IETD cleared were 2.5 and 22 hours. The geometric mean retention fractions at 24 and 48 hours were 7% and 2.4% IETD, respectively. No clear trends were found between parameters describing retention and any related to deposition (e.g., particle size). However, the fraction cleared by nose blowing was related to the frequency of nose blowing and therefore appears to be a characteristic of the individual.
Authors:
J R H Smith; M R Bailey; G Etherington; A L Shutt; M J Youngman
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2010-12-11
Journal Detail:
Title:  Experimental lung research     Volume:  -     ISSN:  1521-0499     ISO Abbreviation:  -     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-12-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8004944     Medline TA:  Exp Lung Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Health Protection Agency, Centre for Radiation Chemical and Environmental Hazards, Chilton, UK.
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