Are high barometric pressure, low humidity and diurnal change of temperature related to the onset of asthmatic symptoms?

Ehara, Akira; Takasaki, Hideki; Takeda, Yuko; Kida, Takeshi; Mizukami, Susumu; Hagisawa, Masahiro; Yamada, Yutaka

doi:10.1046/j.1442-200x.2000.01228.x

Cited by 24 publications

(25 citation statements)

References 9 publications

(16 reference statements)

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“…Like other studies (Ehara et al 2000;Kashiwabara et al 2002Kashiwabara et al , 2003, we compared meteorological events on days with and without a high frequency of emergency room The P value was derived using a two-sample t-test that tested for statistically significant differences in the mean number of visits for days with precipitation to those without; the level of significance is based on the t-test using unequal variances b Excludes May through September visits. When the results from this method of analysis were compared to the case-crossover analyses, some important differences were found.…”

Section: Discussionmentioning

confidence: 99%

“…The first approach paralleled previous strategies employed by other investigators (Ehara et al 2000;Holmen et al 1997) who compared meteorological characteristics on days with a high number of asthma visits relative to other days. In our study, the determination of high-versus other days was based on the 75th percentile of the frequency distribution of daily counts of emergency room visits for each of the four seasons considered.…”

Section: Methodsmentioning

confidence: 99%

“…The availability of hourly weather measurements permitted a more refined evaluation of temporal patterns between changes in meteorological conditions and emergency room visits than previous studies that relied predominantly on daily measurements (Crighton et al 2001;Ehara et al 2000;Kashiwabara et al 2002;Tanaka et al 1998). This evaluation was undertaken by using case-crossover methods that examined associations between the meteorological conditions and emergency room visits according to 6-h time intervals.…”

Section: Methodsmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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

2005

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“…Previous studies have shown that the meteorological risk factors of care visits due to asthma attack are high temperature [11,12], large changes in temperature [13,14], high atmospheric pressure [13,15], low relative humidity [13], and large changes in humidity [14]. However, these data may suffer from publication bias.…”

Section: Introductionmentioning

confidence: 99%

Association of ambient air pollution and meteorological factors with primary care visits at night due to asthma attack

Yamazaki

Shima

Yoda

et al. 2013

Environ Health Prev Med

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Aim The association of outdoor air pollution and meteorological elements with primary care visits at night due to asthma attack was studied. Methods A case-crossover study was conducted in a primary care clinic in Himeji City, Japan. The subjects were 956 children aged 0-14 years who visited the clinic with an asthma attack between the hours of 9 p.m. and 6 a.m. Daily concentrations of particulate matter, ozone, nitrogen dioxide, and a number of meteorological elements were measured, and a conditional logistic regression model was used to estimate odds ratios (ORs) of primary care visits per unit increment of air pollutants or meteorological elements. The analyses took into consideration the effects of seasonality. Results Of the 956 children, 73 (7.6 %) were aged \2 years and 417 (43.6 %) were aged 2-5 years. No association between daily ozone levels and primary care visits due to asthma attack at night in the spring or summer was found. An inverse relation between suspended particulate matter and primary care visits due to asthma attack was detected in the winter. ORs in the summer per degree increment in daily mean temperature was 1.31 [95 % confidential interval (CI) 1.09-1.56], and ORs in the autumn per hourly increment in daily hours of sunshine was 0.94 (95 % CI 0.90-0.99). Conclusion The findings of our study fail to support any association between daily mean concentration of air pollutant and primary care visits at night. However, we did find evidence indicating that certain meteorological elements may be associated with primary care visits

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“…As variability of monthly atmospheric pressure is small compared with weekly variations, most of the studies analyzed only monthly or seasonal variations of event rates, which often lead to inconclusive results (Abrignani et al 2009;Rosas et al 1998). Danet et al (1999) detected a linear V-shaped relationship to acute myocardial infarction and coronary deaths with a minimum at 1,016 hPa, while several studies have instead suggested positive associations (Ehara et al 2000;Hashimoto et al 2004). In the present study, the finding resembles the latter, with positive association between hospital admission and barometric pressure being observed.…”

Section: Discussionmentioning

confidence: 99%

Effects of meteorological parameters on hospital admission for respiratory and cardiovascular diseases

Fong

2012

J Public Health

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Aim Meteorological factors play a role in respiratory and cardiovascular diseases. However, previous studies demonstrated inconsistent results regarding their associations. This paper aims to evaluate their relationships to facilitate anticipatory care for patients with respiratory and cardiovascular diseases. Subject and methods A retrospective time-series study, controlling for air pollution, was adopted to examine the effects of various meteorological factors on emergency hospital admission for chronic respiratory and cardiovascular diseases from 2007 to 2010 in a Hong Kong hospital. Impact of weather was examined up to 3 weeks to account for the possible delayed effects of meteorological factors. Results Barometric pressure was positively associated with hospital admission in a linear fashion, while temperature demonstrated a linear negative association. Delayed effects of air pressure were noted up to lag weeks 2 and 3 for cardiovascular and respiratory admission respectively. Temperature also showed a progressive reduction in lag effects on respiratory and cardiovascular diseases admission up to lag week 3. Relative humidity, global solar radiation and wind speed demonstrated no significant associations with hospital admission. Conclusion Anticipatory care to prevent exacerbations of chronic respiratory and cardiovascular diseases, hence to reduce related admission, might be achieved by the provision of targeted advice triggered by forecasts of low temperature and high barometric pressure.

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Are high barometric pressure, low humidity and diurnal change of temperature related to the onset of asthmatic symptoms?

Abstract: It is thought that change in barometric pressure, relative humidity and temperature had some influence on the worsening of asthmatic symptoms.

Cited by 24 publications

References 9 publications

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

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

Association of ambient air pollution and meteorological factors with primary care visits at night due to asthma attack

Effects of meteorological parameters on hospital admission for respiratory and cardiovascular diseases

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