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Clearing the Air: Asthma and Indoor Air Exposures

Published bySylvia Mathews Modified over 5 years ago

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Presentation on theme: "Clearing the Air: Asthma and Indoor Air Exposures"— Presentation transcript:

1 Clearing the Air: Asthma and Indoor Air Exposures
Institute of Medicine report on what is known about indoor air exposures and asthma Exposures and asthma onset Exposures and worsening asthma Effectiveness of interventions 12 person expert panel convened in late 1998, final report issued January 2000

2 Exposures Addressed in IOM Report
Biological Animals Cats / dogs / rodents/ cows / horses / birds Cockroaches House dust mites Endotoxin Fungi Plants Pollens Infectious agents Chemical NOx Pesticides Fragrances Plasticizers VOCs Formaldehyde Environmental tobacco smoke Ozone / PM/ SOx

3 Classification Scheme of IOM Report
Distinction between development of asthma and exacerbation of asthma Categories of evidence Sufficient evidence of a causal relationship Sufficient evidence of an an association Limited or suggestive evidence of an association Inadequate or insufficient evidence to determine Limited or suggestive evidence of no association

4 Exposures Associated With Exacerbation of Asthma
Sufficient evidence of a causal relationship Environmental tobacco smoke (preschool aged children) Cat / Cockroach / House Dust Mite Sufficient evidence of an association Dog / Fungi – Molds / Rhinovirus NOx / NO2

5 Exposures Associated With Exacerbation of Asthma
Limited or suggestive evidence ETS (other than preschoolers) / formaldehyde / fragrances Birds / C. pneumoniae / M. pneumoniae / RSV Inadequate evidence Pesticides / Plasticizers / VOCs Everything else

6 Exposures Associated With Development of Asthma
Sufficient evidence of a causal relationship House Dust Mite Sufficient evidence of an association Environmental tobacco smoke (preschool aged children) Limited or suggestive evidence Cockroach (infants) / RSV Inadequate evidence Everything else Limited or suggestive evidence of no association Rhinovirus (adults)

7 Sufficient Evidence of an Association for Mitigation Strategies for House Dust Mite
Humid climates Air conditioning for humidity control Reduce nests / bedding measures Moderately or seasonally humid Open windows / upper floor apartment Reduce nests / bedding measures / chemical treatment Dry areas Daily ventilation

8 Limited Evidence for Effectiveness of Mitigation Strategies for Cockroach Exposure
Combination of extermination and control of allergen reservoirs Extermination alone ineffective; cleaning alone ineffective

9 Limited Evidence for Effectiveness of Mitigation Strategies for Cat Exposure
Remove cat May also require removal of reservoirs of allergen to be effective Washing cat

10 Increasing ventilation
Effectiveness of Mitigation Strategies for Reducing ETS and Chemical Exposure Smoking cessation Air cleaning Technologically capable of reducing concentrations Increasing ventilation

11 Research Recommendations, IOM Asthma Report
Exposure Prenatal exposures Assessment of age at first exposure Importance of gene – environment interaction Strategies to reduce exposure Rigorous mitigation trials Importance of considering target population Integration of health and healthy environment sciences

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