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Rainfall-Associated Bronchospasm Epidemics: The Epidemiological Effects of Air Pollutants and Weather Variables

BACKGROUND: This study compares different risk factors in patients visiting a hospital during five rainfall-associated bronchospasm epidemics in Ahvaz and those visiting on other occasions. METHODS: This case-control study was conducted on 5307 patients with bronchospasm admitted to the Emergency De...

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Autores principales: Masoumi, Kambiz, Haddadzadeh Shoushtari, Maryam, Forouzan, Arash, Asgari Darian, Ali, Dastoorpoor, Maryam, Ebrahimzadeh, Pegah, Aghababaeian, Hamidreza
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Hindawi 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5635285/
https://www.ncbi.nlm.nih.gov/pubmed/29089817
http://dx.doi.org/10.1155/2017/9252069
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author Masoumi, Kambiz
Haddadzadeh Shoushtari, Maryam
Forouzan, Arash
Asgari Darian, Ali
Dastoorpoor, Maryam
Ebrahimzadeh, Pegah
Aghababaeian, Hamidreza
author_facet Masoumi, Kambiz
Haddadzadeh Shoushtari, Maryam
Forouzan, Arash
Asgari Darian, Ali
Dastoorpoor, Maryam
Ebrahimzadeh, Pegah
Aghababaeian, Hamidreza
author_sort Masoumi, Kambiz
collection PubMed
description BACKGROUND: This study compares different risk factors in patients visiting a hospital during five rainfall-associated bronchospasm epidemics in Ahvaz and those visiting on other occasions. METHODS: This case-control study was conducted on 5307 patients with bronchospasm admitted to the Emergency Department of Imam Khomeini Hospital in Ahvaz (Iran) from late October to December (as the epidemic) and 916 patients admitted from late January to March (as the nonepidemic) in 2011 to 2015. RESULTS: A total of the 41.7% of the cases and 48.8% of the controls had episodes of bronchospasm, suggesting a significant difference between the two groups (P < 0.001). The mean concentrations of PM(10), NO, NO(2), and NO(x) pollutants (except O(3)) were significantly higher in the nonepidemic periods (P < 0.05). The adjusted analysis showed a direct significant relationship between emergency respiratory admissions and each unit of increase in NO and SO(2) concentration during the epidemic periods and NO(2) concentration during the nonepidemic periods. During the epidemic periods, a direct and significant relationship was also observed between respiratory admissions and each unit of increase in relative humidity and evaporation. CONCLUSION: The results suggest that certain pollutants and weather variables are associated with the risk of emergency respiratory admissions during epidemic periods.
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spelling pubmed-56352852017-10-31 Rainfall-Associated Bronchospasm Epidemics: The Epidemiological Effects of Air Pollutants and Weather Variables Masoumi, Kambiz Haddadzadeh Shoushtari, Maryam Forouzan, Arash Asgari Darian, Ali Dastoorpoor, Maryam Ebrahimzadeh, Pegah Aghababaeian, Hamidreza Can Respir J Research Article BACKGROUND: This study compares different risk factors in patients visiting a hospital during five rainfall-associated bronchospasm epidemics in Ahvaz and those visiting on other occasions. METHODS: This case-control study was conducted on 5307 patients with bronchospasm admitted to the Emergency Department of Imam Khomeini Hospital in Ahvaz (Iran) from late October to December (as the epidemic) and 916 patients admitted from late January to March (as the nonepidemic) in 2011 to 2015. RESULTS: A total of the 41.7% of the cases and 48.8% of the controls had episodes of bronchospasm, suggesting a significant difference between the two groups (P < 0.001). The mean concentrations of PM(10), NO, NO(2), and NO(x) pollutants (except O(3)) were significantly higher in the nonepidemic periods (P < 0.05). The adjusted analysis showed a direct significant relationship between emergency respiratory admissions and each unit of increase in NO and SO(2) concentration during the epidemic periods and NO(2) concentration during the nonepidemic periods. During the epidemic periods, a direct and significant relationship was also observed between respiratory admissions and each unit of increase in relative humidity and evaporation. CONCLUSION: The results suggest that certain pollutants and weather variables are associated with the risk of emergency respiratory admissions during epidemic periods. Hindawi 2017 2017-09-27 /pmc/articles/PMC5635285/ /pubmed/29089817 http://dx.doi.org/10.1155/2017/9252069 Text en Copyright © 2017 Kambiz Masoumi et al. https://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Masoumi, Kambiz
Haddadzadeh Shoushtari, Maryam
Forouzan, Arash
Asgari Darian, Ali
Dastoorpoor, Maryam
Ebrahimzadeh, Pegah
Aghababaeian, Hamidreza
Rainfall-Associated Bronchospasm Epidemics: The Epidemiological Effects of Air Pollutants and Weather Variables
title Rainfall-Associated Bronchospasm Epidemics: The Epidemiological Effects of Air Pollutants and Weather Variables
title_full Rainfall-Associated Bronchospasm Epidemics: The Epidemiological Effects of Air Pollutants and Weather Variables
title_fullStr Rainfall-Associated Bronchospasm Epidemics: The Epidemiological Effects of Air Pollutants and Weather Variables
title_full_unstemmed Rainfall-Associated Bronchospasm Epidemics: The Epidemiological Effects of Air Pollutants and Weather Variables
title_short Rainfall-Associated Bronchospasm Epidemics: The Epidemiological Effects of Air Pollutants and Weather Variables
title_sort rainfall-associated bronchospasm epidemics: the epidemiological effects of air pollutants and weather variables
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5635285/
https://www.ncbi.nlm.nih.gov/pubmed/29089817
http://dx.doi.org/10.1155/2017/9252069
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