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5.
Am J Respir Crit Care Med ; 160(1): 33-9, 1999 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-10390376

RESUMO

Eleven mild atopic asthmatic patients were exposed for 6 h, in randomized order, to air, 100 ppb O3, 200 ppb NO2, and 100 ppb O3 + 200 ppb NO2, followed immediately by bronchial allergen challenge. Subsequently 10 of these patients were exposed for 3 h to air, 200 ppb O3, 400 ppb NO2, and 200 ppb O3 + 400 ppb NO2, followed immediately by bronchial allergen challenge. All exposures were carried out in an environmental chamber, with intermittent moderate exercise, and a minimal interval of 2 wk. Exposure for 6 h to 100 ppb O3, 200 ppb NO2, and 100 ppb O3 + 200 ppb NO2 did not lead to any significant increase in the airway response of these individuals to inhaled allergen, when compared with exposure for 6 h to air. In contrast, exposure for 3 h to 200 ppb O3, 400 ppb NO2, and 200 ppb O3 + 400 ppb NO2 significantly decreased the dose of allergen (in log cumulative breath units [CBU]) required to decrease FEV1 by 20% (allergen PD20FEV1), compared with exposure to air (geometric mean CBU: 3.0 for air versus 2.66 for O3 [p = 0.002]; 2.78 for NO2 [p = 0. 018]; 2.65 for O3 + NO2 [p = 0.002]). These results suggest that the pollutant-induced changes in airway response of mild atopic asthmatics to allergen may be dependent on a threshold concentration rather than the total amount of pollutant inhaled over a period of time.


Assuntos
Poluentes Atmosféricos/farmacologia , Resistência das Vias Respiratórias/efeitos dos fármacos , Alérgenos , Asma/fisiopatologia , Testes de Provocação Brônquica , Dióxido de Nitrogênio/farmacologia , Ozônio/farmacologia , Hipersensibilidade Respiratória/fisiopatologia , Adulto , Resistência das Vias Respiratórias/fisiologia , Asma/diagnóstico , Asma Induzida por Exercício/diagnóstico , Asma Induzida por Exercício/fisiopatologia , Feminino , Volume Expiratório Forçado/efeitos dos fármacos , Volume Expiratório Forçado/fisiologia , Humanos , Testes Intradérmicos , Masculino , Hipersensibilidade Respiratória/diagnóstico , Método Simples-Cego
8.
JACEP ; 8(9): 363-7, 1979 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-470279

RESUMO

Central retinal artery occlusion is characterized by sudden, painless visual loss due to blockage of retinal blood flow. It has been reported in all age groups including children but is most frequent in the sixth decade. Both thrombosis and embolism have been suggested as possible mechanisms. The emergency treatment includes intravenous acetazolamide, digital ocular massage, and inhalation of 5% carbon dioxide -- 95% oxygen for ten minutes. Following emergency treatment, immediate ophthalmologic referral and consultation is required. Comprehensive medical evaluation should be initiated to exclude systemic vascular disease.


Assuntos
Arteriopatias Oclusivas , Artéria Retiniana , Idoso , Arteriopatias Oclusivas/diagnóstico , Arteriopatias Oclusivas/etiologia , Arteriopatias Oclusivas/fisiopatologia , Arteriopatias Oclusivas/terapia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Prognóstico , Artéria Retiniana/fisiopatologia , Trombose/complicações
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