Document Detail

Efficacy of the ramathibodi nasal filter in a simulated human airway evaluated by a laser diode portable dust monitor under low laser smoke particle concentration.
MedLine Citation:
PMID:  12081119     Owner:  NLM     Status:  MEDLINE    
The Ramathibodi nasal filter attached to a simulated human airway was proposed to filter laser smoke particles. The simulated human airway composed of nasal and pharyngeal model, airway passage and lung model machine which mimicked the human respiratory system. The laser smoke particles represented a suspended particulate matter in a highly air-pollutted area such as at a main roadside in Bangkok. The experiment was done in the Department of Otolaryngology, Ramathibodi Hospital, from January to March 2000. The simulated human airway got an equal amount of laser smoke particles in a sealed plastic box for 1 min. The residual amount of laser smoke particles in a closed system of the simulated human airway was measured by a laser diode portable dust monitor for 1 min in each cycle and calculated as a mean and standard deviation. Without the Ramathibodi nasal filter of 39 sample pairs, the amounts of PM15, PM10 and PM2.5 were 52.3 +/- 6.8, 43.0 +/- 4.9 and 37.0 +/- 3.5 mcg/m3 respectively. With the Ramathibodi nasal filter of 39 pairs sample, the amounts of PM15, PM10 and PM2.5 were 48.1 +/- 9.9, 39.1 +/- 9.1 and 33.2 +/- 7.2 mcg/m3 respectively. Ramathibodi nasal filter efficacy for all laser smoke particle sizes evaluated statistically using t-test showed significant differences from those without the filter. Filtration efficacy should be tested further in higher concentrations of laser smoke particles and applied in human nasal vestibules under a critical air-polluted condition.
Kunchitthape Tanpowpong; Chumroon Chiratthiti
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of the Medical Association of Thailand = Chotmaihet thangphaet     Volume:  85     ISSN:  0125-2208     ISO Abbreviation:  J Med Assoc Thai     Publication Date:  2002 Feb 
Date Detail:
Created Date:  2002-06-25     Completed Date:  2002-07-25     Revised Date:  2006-04-19    
Medline Journal Info:
Nlm Unique ID:  7507216     Medline TA:  J Med Assoc Thai     Country:  Thailand    
Other Details:
Languages:  eng     Pagination:  195-9     Citation Subset:  IM    
Department of Otolaryngology, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand.
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MeSH Terms
Air Pollutants, Occupational / adverse effects*
Dust / adverse effects*
Environmental Monitoring
Filtration / instrumentation*
Models, Biological
Particle Size
Respiratory Protective Devices*
Reg. No./Substance:
0/Air Pollutants, Occupational; 0/Dust

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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