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Asthma epidemics linked to airflow patterns in thunderstorms
May 16, 2001It's the airflow patterns in thunderstorms, rather than the electrical activity, thunder, or rain, which trigger asthma epidemics, concludes research in Thorax.
The hospital admission rates for asthma and airflow patterns during thunderstorms up to 80 km away were studied for six towns in south eastern Australia between 1995 and 1998. Hourly pollen counts during one severe epidemic of asthma were also studied.
The researchers concentrated particularly on thunderstorm outflows. These are created by downdraughts of cold air within the thunderstorm that sweep up and concentrate atmospheric particles, released by rain, in a narrow band of air near ground level.
An outflow preceded a third of all asthma epidemics, overall. But during late spring and summer, when pollen counts were highest, an outflow preceded almost half of all epidemics. The hourly pollen counts during one epidemic showed that the amount of grass pollen grains trapped in the thunderstorm outflow were between four and 12 times higher than elsewhere. Emergency calls were registered within half an hour of an outflow being recorded.
Admission rates for asthma were not pushed beyond expected levels during thunderstorms without outflows, and a cold front of air by itself had no significant impact on admission rates.
The authors conclude that the powerful action of a thunderstorm outflow sweeps up ruptured and intact pollen grains and forces them into a band of air rising up to 1 km above ground. Asthmatics who breathe in this super concentrated mix of allergens experience an acute airways response.
British Medical Journal (BMJ)
An outflow preceded a third of all asthma epidemics, overall. But during late spring and summer, when pollen counts were highest, an outflow preceded almost half of all epidemics. The hourly pollen counts during one epidemic showed that the amount of grass pollen grains trapped in the thunderstorm outflow were between four and 12 times higher than elsewhere. Emergency calls were registered within half an hour of an outflow being recorded.
Admission rates for asthma were not pushed beyond expected levels during thunderstorms without outflows, and a cold front of air by itself had no significant impact on admission rates.
The authors conclude that the powerful action of a thunderstorm outflow sweeps up ruptured and intact pollen grains and forces them into a band of air rising up to 1 km above ground. Asthmatics who breathe in this super concentrated mix of allergens experience an acute airways response.
British Medical Journal (BMJ)
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Exposure shortly after birth to ambient metals from residential heating oil combustion and particles from diesel emissions are associated with respiratory symptoms in young inner city children.
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New research presents strong evidence that the "synergistic" effect of early-life exposure to both outdoor traffic-related pollution and indoor endotoxin causes more harm to developing lungs than one or the other exposure alone.
Johns Hopkins researchers track down protein responsible for chronic rhinosinusitis with polyps
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People preferentially marry those with similar ancestry, but their decisions are not necessarily based on hair, eye or skin colour.
Common plastics chemicals linked to ADHD symptoms
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Asthma a significant risk factor for complications in children with H1N1
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Mother's Depression a Risk Factor in Childhood Asthma Symptoms, Study Suggests
Asthma symptoms can worsen in children with depressed mothers, according to research from Johns Hopkins Children's Center published online in the Journal of Pediatric Psychology.
Sweet -- sugared polymer a new weapon against allergies and asthma
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