Pulmonary and Systemic Effects of Exposure to Wood Smoke
NCT ID: NCT03302117
Last Updated: 2017-10-04
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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UNKNOWN
20 participants
OBSERVATIONAL
2017-06-14
2018-02-08
Brief Summary
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Detailed Description
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Detailed description Air pollution is associate with increased pulmonary and cardiovascular mobility and mortality. UNICEF recently published a report highlighting the health effects of air pollution from a global perspective, with particular focus on pediatrics population. Overall, air pollution is estimated to cause about 7 million deaths each year in the world, of which about 600,000 of these apply to children under 5 years (1). Indoor and outdoor air pollutants are the 3rd and 9th most common cause of death. Nearly 3 billion people are dependent on biomass for daily needs, Exposure to wood smoke has been linked to elevated asthma prevalence, increased asthma symptoms in children and adults, as well as higher hospital admissions due to asthma attacks. The association between long-term indoor wood smoke exposure and the development and worsening of chronic obstructive pulmonary disease has been shown to be strong in many epidemiological studies (2,3), and the risk for chronic obstructive pulmonary disease development has been estimated to be more than doubled for solid fuel smoke compared with smoke from other types of fuels (4). Exposure to smoke from combustion of wood and other biomass fuels has also been shown to increase the risk for acute and chronic lower respiratory tract infections, including pneumonias and tuberculosis. The aim of the current study was to further characterize the respiratory and systemic effects of exposure to wood smoke emitted from incomplete soot-rich combustion in a wood stove.
The study will be performed in a randomized, double blind, crossover fashion. Twenty healthy subjects will be exposed on two occasions, under well-controlled situations, to filtered air and wood smoke in an exposure chamber at Thermochemical Energy Conversion Laboratory at Umeå University. The chamber is made of stainless steel, has a volume of a 15.3 m3 and an air exchange rate of around three times per hour and has been previously described (5). The mean particle mass concentration of wood smoke will be 450 μg/m3. The exposures will last for two hours, during which the subject will perform intermittent exercise on a bicycle ergometer, alternate with rest at 15-minute intervals, to achieve an average minute ventilation of 20 L/min/m2 body surface. During the exposures, symptoms well be recorded according to the modified Borg scale, as described previously (6). Spirometry and impulse oscillometry system (IOS) will be used to assess the lung function at baseline and immediately after each exposure. Bronchoscopy will be performed 6 hours after each exposure. Differential cell counts and soluble components will be analyzed in peripheral blood sampling at baseline and 6 hours after each exposure.
Conditions
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Study Design
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CASE_CROSSOVER
PROSPECTIVE
Interventions
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Wood smoke exposure
Healthy volunteers will exposed to filtered air alternate with wood smoke generated from incomplete wood smoke combustion to assess the local and systemic effect of theses exposures
Eligibility Criteria
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Inclusion Criteria
* Non-smoker
* Non-allergic
Exclusion Criteria
* Renal failure
* Ischemic heart disease
* History of hematological disease
* Previous smoking.
20 Years
40 Years
ALL
Yes
Sponsors
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Umeå University
OTHER
Responsible Party
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Principal Investigators
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Ala Muala, MD, PhD
Role: PRINCIPAL_INVESTIGATOR
Department for Public Health and Clinical Medicine
Locations
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Department for Public Health and Clinical Medicine
Umeå, , Sweden
Countries
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Central Contacts
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Facility Contacts
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References
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Friedrich MJ. UNICEF Reports on the Impact of Air Pollution on Children. JAMA. 2017 Jan 17;317(3):246. doi: 10.1001/jama.2016.19034. No abstract available.
Po JY, FitzGerald JM, Carlsten C. Respiratory disease associated with solid biomass fuel exposure in rural women and children: systematic review and meta-analysis. Thorax. 2011 Mar;66(3):232-9. doi: 10.1136/thx.2010.147884. Epub 2011 Jan 19.
Hu G, Zhou Y, Tian J, Yao W, Li J, Li B, Ran P. Risk of COPD from exposure to biomass smoke: a metaanalysis. Chest. 2010 Jul;138(1):20-31. doi: 10.1378/chest.08-2114. Epub 2010 Feb 5.
Kurmi OP, Semple S, Simkhada P, Smith WC, Ayres JG. COPD and chronic bronchitis risk of indoor air pollution from solid fuel: a systematic review and meta-analysis. Thorax. 2010 Mar;65(3):221-8. doi: 10.1136/thx.2009.124644.
Unosson J, Blomberg A, Sandstrom T, Muala A, Boman C, Nystrom R, Westerholm R, Mills NL, Newby DE, Langrish JP, Bosson JA. Exposure to wood smoke increases arterial stiffness and decreases heart rate variability in humans. Part Fibre Toxicol. 2013 Jun 6;10:20. doi: 10.1186/1743-8977-10-20.
Rudell B, Ledin MC, Hammarstrom U, Stjernberg N, Lundback B, Sandstrom T. Effects on symptoms and lung function in humans experimentally exposed to diesel exhaust. Occup Environ Med. 1996 Oct;53(10):658-62. doi: 10.1136/oem.53.10.658.
Other Identifiers
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WSIII
Identifier Type: -
Identifier Source: org_study_id