Influence of climate factors on emergency visits for childhood asthma attack

Hashimoto, Mitsuo; Fukuda, T; Shimizu, Tetsuya; Watanabe, S; Watanuki, Satoshi; Eto, Yoshikatsu; Urashima, Mitsuyoshi

doi:10.1111/j.1442-200x.2004.01835.x

Cited by 78 publications

(52 citation statements)

References 23 publications

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“…the relationships here established only demonstrate the relative importance of the coldest and warmest days. the inversely proportional relationship with minimum temperatures confirms the conclusions also reached in other studies (rossi, 1993;Hervás, 2013), although other authors have shown the existence of directly proportional relationships (Hashimoto, 2004;Mireku et al, 2009) such as the one found here. in all the analyses performed, the wind speed variable is directly proportional to the number of asthma attacks (despite having a low importance).…”

Section: Fig2 -Velocidade E Direcção Do Vento Nos Dias De Trovoada (supporting

confidence: 81%

Environmental conditions and childhood asthma in Lisbon. An exploratory analysis for autumn thunderstorm

Canário¹,

Fragoso²,

Mora³

et al. 2015

Finisterra

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-asthma attacks triggered by thunderstorms have been described in seve ral countries. the rises in pollen concentrations, attributed to atmospheric electrical discharges, were considered the leading cause of these outbreaks. the presence of variou s pollutants as well as certain weather conditions may contribute synergistically to the onse t of exacerbations in patients with a previous diagnosis of asthma. this study aims to investigate whether atmospheric electrical discharges exert any influence on the number of emergency admissions due to childhood asthma, in autumn, in Lisbon. the investigation will examine whether there are isolated or combined effects of meteorological variables, pollu tant and pollen concentrations that favour an increase in the number of exacerbations of asthma symptoms. for this purpose we compared the number of asthma admissions in period s with and without thunderstorms in a Lisbon paediatric emergency service. increa sing pollen concentrations attributed to thunderstorms reported in the literature were not found in Lisbon in the days analysed. there was also an absence of relationship between admissions for asthma and air pollution. associations between hospitalisations due to asthm a crisis and atmospheric variables were documented. Canário, M. Fragoso, C. Mora and H. Nogueira no influence of atmos pheric electrical discharges in the variation of the number of emergency admissions due to childhood asthma was verified in the studied period (autumn). On the contrary, it was verified that a decrease in minimum temperature positively reinforces these admissions.Keywords: asthma, thunderstorms, atmospheric electrical discharges, minimum temperature, Lisbon resumo -condiçõeS aMBientaiS e aSMa infantil eM liSBoa. análiSe exploratória eM diaS de troVoada no outono. Crises de asma desencadeadas por trovoadas têm sido descritas em vários países, como consequência do aumento das concen trações de pólenes. Vários poluentes e certas condições meteorológicas podem contribuir sinergicamente para a agudização dos sintomas em indivíduos com asma. investiga-se se as descargas eléctricas atmosféricas (Dea) aumentam as admissões hospitalares à urgência infan til, no Outono, em Lisboa. analisaram-se as entradas numa urgência pediátrica em Lisboa, comparando o número de admissões por asma em períodos com e sem trovoadas. O aumento das concentrações de pólenes no ar, atribuído às trovoadas não se verificou, em Lisboa, no período analisado. Confirmou-se também a ausência de relação entre admissões por asma e poluen tes e documentaram-se associações entre aquelas e as variáveis atmosféricas. não se observou associação entre descargas eléctricas atmosféricas e admissões ao serviço de Urgên cia pediátrico por asma. no entanto, verificou-se que a diminuição da temperatura mínima provocou o aumento de admissões hospitalares por asma no período estudado.Palavras-chave: asma, trovoadas, descargas eléctricas atmosféricas, temperatura mínima, Lisboa.résumé -conditionS atMoSphériqueS et aSthMe infantile...

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Section: Fig2 -Velocidade E Direcção Do Vento Nos Dias De Trovoada (supporting

confidence: 81%

Environmental conditions and childhood asthma in Lisbon. An exploratory analysis for autumn thunderstorm

Canário¹,

Fragoso²,

Mora³

et al. 2015

Finisterra

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“…Environmental causes of increased asthma episodes may involve atmospheric events that are associated with increased levels of atmospheric pollution and antigens. Several studies have also reported that asthmatic symptoms are influenced by meteorological events including cold temperature (Beer et al 1991;Greenburg et al 1966;Yuksel et al 1996), temperature change (Crighton et al 2001), relative humidity, rainfall (Celenza et al 1996), fog (Kashiwabara et al 2002;Logan 1953), wind speed (Hashimoto et al 2004;Newell and Swafford 1963), change in barometric pressure, and thunderstorms (Newson et al 1997;Sutherland and Hall 1994). Despite this work, considerable uncertainty remains regarding the manner in which weather and childhood asthma are related.…”

Section: Introductionmentioning

confidence: 94%

Frequency of emergency room visits for childhood asthma in Ottawa, Canada: the role of weather

2005

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The aim of this study was to evaluate associations between meteorological conditions and the number of emergency department visits for asthma in a children's hospital in Ottawa, Canada. A case-crossover study design was used. Hospital emergency department visits for asthma between 1992 and 2000 were identified based on patients' presenting complaints. We obtained hourly measures for the following meteorological variables: wind speed, temperature, atmospheric pressure, relative humidity, and visibility. Particular emphasis was placed on exploring the association between asthma visits and fog, thunderstorms, snow, and liquid and freezing forms of precipitation. In total, there were 18,970 asthma visits among children between 2 and 15 years of age. The number of visits and weather characteristics were grouped into 6 h case and control intervals. The occurrence of fog or liquid precipitation was associated with an increased number of asthma visits, while snow was associated with a reduced number (P<0.05). Stratified analyses by season found no association in any of the four calendar intervals between the number of asthma visits and visibility, change in relative humidity and change in temperature. In contrast, summertime thunderstorm activity was associated with an odds ratio of 1.35 (95% CI=1.02-1.77) relative to summer periods with no activity. Models that incorporate calendar and meteorological data may help emergency departments to more efficiently allocate resources needed to treat children presenting with respiratory distress.

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“…They not only confirmed their previous observation [14], but went further to suggest that the saturated density of airborne water droplets may stimulate bronchial constriction to provoke asthma attack. Probably implying the same, Hashimoto et al [21] found that the number of visits per night of children (due to asthma attack) to an emergency room in a large urban hospital was elevated when there was a rapid decrease in barometric pressure, temperature and humidity as well as low wind velocity. In this sense, it is highly probable that T 365,3 and T 365,2 are the measures of density of fine water particles in air which may induce asthma attacks among children.…”

Section: Discussionmentioning

confidence: 96%

Correlation of light transmittance with asthma attack: fine water particles as a possible inducing factor of asthma

Kanaya¹,

Okamoto

Shimbo

et al. 2010

Environ Health Prev Med

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Background and objectives It has been postulated that air-borne fine water particles (or mist) can induce asthma attacks in asthmatic children. To date, no attempt has been made to quantify the density of air-borne fine water particles with the aim of relating particle density to the etiology of asthma among children. The aim of this study was to investigate the relation of asthma attack frequency and the particle density evaluated in terms of light transmittance. Methods The density of fine water particles was quantified by measuring reductions in light transmittance at 250, 365 and 580 nm at an outdoor location when the surroundings were in darkness. The measurements were made at distances varying from 1 to 3 m from the light sources and performed every morning and evening for 1 year. Each day was separated into two half-day units [i.e., morning (from midnight to noon) and afternoon (from noon to midnight)]. The number of asthma attacks among 121 enrolled asthmatic children was counted for each unit. A possible correlation between the transmittance reduction and frequency of asthma attacks was assessed. Results A significant difference was observed in the extent of reduction in light transmittance at 365 nm between the units with asthma attacks and those without attacks. Furthermore, the reduction in the transmittance was more evident when more asthma attacks were recorded among the patients. No difference was detected in the reduction in light transmittance at 250 or 580 nm. Conclusions These results support the hypothesis that airborne fine water particles are among the etiological factors that induce asthma attacks in asthmatic children.

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Influence of climate factors on emergency visits for childhood asthma attack

Abstract: These results suggest that these models might quantify contributions of specific climate conditions and other seasonal factors on the number of emergency visits per night for childhood asthma attack in Tokyo, Japan.

Cited by 78 publications

References 23 publications

Environmental conditions and childhood asthma in Lisbon. An exploratory analysis for autumn thunderstorm

Environmental conditions and childhood asthma in Lisbon. An exploratory analysis for autumn thunderstorm

Frequency of emergency room visits for childhood asthma in Ottawa, Canada: the role of weather

Correlation of light transmittance with asthma attack: fine water particles as a possible inducing factor of asthma

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