Grass allergy increases the risk of tree pollen sensitization: A warning to urban planners☆☆☆★★★♢

Vieira, Francisco de Assis Machado; Ferreira, Ernesto Nascimento; Cruz, Álvaro Augusto

doi:10.1016/s0091-6749(98)70293-3

Cited by 12 publications

(9 citation statements)

References 2 publications

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“…A DPOC foi mais freqüente de maio a novembro. Esse comportamento pode ser explicado por três observações: a) a região nordeste do Rio Grande do Sul, as transições do outono para o inverno e do inverno para a primavera caracterizam-se por mudanças bruscas de umidade e temperatura; b) há duas estações polínicas, uma no outono e outra na primavera (31) ; e c) o surto de influenza ocorre entre os meses de maio e agosto.…”

Section: Discussionunclassified

Doenças respiratórias como causa de internações hospitalares de pacientes do Sistema Único de Saúde num serviço terciário de clínica médica na região nordeste do Rio Grande do Sul

et al. 2001

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Objetivo: Levantamento epidemiológico das internações hospitalares por doenças respiratórias no Serviço de Clínica Médica do Hospital Geral de Caxias do Sul no Estado do Rio Grande do Sul, região sul do Brasil. Pacientes e métodos: Estudo retrospectivo realizado no Hospital Universitário entre novembro de 1998 e novembro de 1999. Os dados de: a) causa primária da internação; b) doenças associadas; c) variação sazonal; d) duração da internação; e) mortalidade foram obtidos do arquivo médico informatizado do SCM-HG. Resultados: De 1.200 internações no SCM-HG, 228 (19%) apresentaram como causa primária enfermidade respiratória. As causas mais freqüentes de admissão hospitalar foram DPOC -- 94 pacientes (41,3%), pneumonias -- 68 (29,8 %) e asma brônquica -- 22 (9,6%). Cinqüenta (21,9%) indivíduos apresentaram comorbidades: insuficiência cardíaca -- 18 (7,7%), hipertensão arterial sistêmica -- 15 (6,4%) e diabetes melito -- 10 (4,4%). As pneumonias tiveram maior prevalência no período compreendido entre setembro e novembro, a asma brônquica entre outubro e novembro e a DPOC entre maio a novembro. O tempo médio de internação foi de 10,4 ± 10 dias. A mortalidade da amostra, de 26 (11,4%) pacientes. Conclusões: 1) Doenças respiratórias foram responsáveis por aproximadamente 1/5 das internações no SCM-HG. 2) Portadores de DPOC representam a maior parcela dos pacientes. 3) A duração média de internação dos com doença respiratória foi maior do que o restante dos pacientes do hospital (10,4 dias versus 7,7 dias, respectivamente). 4) DPOC, pneumonias e asma brônquica apresentaram a variação sazonal esperada.

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Section: Discussionunclassified

Doenças respiratórias como causa de internações hospitalares de pacientes do Sistema Único de Saúde num serviço terciário de clínica médica na região nordeste do Rio Grande do Sul

et al. 2001

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“…This has already been described in other European studies in which grass pollens were also more abundant in rural areas than in urban ones (Kasprzyk, 2006;Sikoparija et al, 2006). Human exposure could be significant due to the successive flowering of a high number of grass species (Vieira et al, 1998).…”

Section: Pollen Counts In Rural and Urban Areasmentioning

confidence: 99%

Human exposure to allergenic pollens: A comparison between urban and rural areas

Bosch-Cano

Bernard

Súdre

et al. 2011

Environmental Research

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a b s t r a c tBackground: Pollinosis is found more frequently in urban areas than in rural environments. This could be partly related to the different types of pollen exposure in these dissimilar areas. The objective of this study was to compare the distribution of pollen in these environments across an urbanization gradient. Methods: Daily pollen abundances were obtained in France using Hirst-type sensors. Sampling was conducted from January to June in 2003 and 2006 in a rural area, a semi-rural area and in two urban areas, which were characterized by several urbanization criteria. Results: Total allergenic pollen abundance was higher in rural and semi-rural areas than in urban areas irrespective of the sampling year. Multivariate analyses showed that pollen exposures differed according to the type of area and were strongly explained by the urbanization gradient. Grass, ash, birch, alder, hornbeam, hazel and plantain pollen quantities exceeded the allergy threshold more often in rural settings than in urban areas. In urban areas, only plane pollen quantities exceeded the allergy threshold more often than in rural areas. Conclusions: Allergenic pollen exposure is higher in rural areas than in urban areas, and the most abundant pollen in each area did not originated from the same taxa. This result should be taken into account in epidemiological studies comparing allergies in rural and urban areas to adapt the panel of pollen extracts for human environmental exposure. In addition, this study highlights that some ornamental trees produce a large number of allergenic pollens and provide new sources of aeroallergens.

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“…This outcome has been mainly attributed to improved hygiene standards (hygiene hypothesis) [4], changes in exposure to environmental risk factors and the increasing tendency, particularly in the westernized lifestyle, to live in heated and air-conditioned environments where minimal air exchange with the outdoor environment occurs [5]. Changes in climate [6] following direct or indirect anthropological actions [7,8] have also modified plant characteristics and their distribution; moreover, changes in the weather have affected pollen distribution and the length of pollination periods. Air pollution can influence the allergenic content of plants causing modifications in pollen production and allergenic proteins of pollen grains [9].…”

Section: Introductionmentioning

confidence: 99%

Airborne Pollen Concentrations and the Incidence of Allergic Asthma and Rhinoconjunctivitis in Northern Italy from 1992 to 2003

Ridolo

Albertini²,

Giordano³

et al. 2006

Int Arch Allergy Immunol

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Background: Aeroallergens and the environment play an important role in the pathogenesis of respiratory allergies. In a 12-year study carried out in Northern Italy (geographic area of Parma), the effects of airborne pollen and meteorological conditions on the incidence of allergic asthma and rhinoconjunctivitis were evaluated. Patients and Methods: Among 9,060 subjects examined for respiratory pathologies at our Allergy Unit, Parma Hospital, Italy, from 1992 to 2003, only 1,054 positive to only one type of inhalant allergen in the skin prick test were studied, to avoid bias of cross-reactivity. Allergy and clinical aspects were compared with the duration of the pollination period, and peaks and total concentrations of airborne pollen. Results: Our data showed a significantly growing trend of allergy to mites, pets and birch pollen and a significant increase in asthma, and a significantly decreasing trend of positive reactions to grasses and a decrease in rhinoconjunctivitis. At the same time, there was a significant decrease in total pollen counts, concentration peaks and pollination period of grasses. A significant increase was only observed in ragweed and ash-olive total and peak pollen concentrations. Conclusions: Significant correlations between the increasing incidence in asthma and allergy to mites, pets and birch pollen are shown. The decrease in the total pollen count and concentration peaks of grass pollen was correlated to the decreasing trend of rhinoconjunctivitis. The trend of increasing concentrations of ash-olive and ragweed pollen was not accompanied by an increase in the related allergy.

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Grass allergy increases the risk of tree pollen sensitization: A warning to urban planners☆☆☆★★★♢

Cited by 12 publications

References 2 publications

Doenças respiratórias como causa de internações hospitalares de pacientes do Sistema Único de Saúde num serviço terciário de clínica médica na região nordeste do Rio Grande do Sul

Doenças respiratórias como causa de internações hospitalares de pacientes do Sistema Único de Saúde num serviço terciário de clínica médica na região nordeste do Rio Grande do Sul

Human exposure to allergenic pollens: A comparison between urban and rural areas

Airborne Pollen Concentrations and the Incidence of Allergic Asthma and Rhinoconjunctivitis in Northern Italy from 1992 to 2003

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