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

RESUMEN

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.


Asunto(s)
Contaminantes Atmosféricos/farmacología , Resistencia de las Vías Respiratorias/efectos de los fármacos , Alérgenos , Asma/fisiopatología , Pruebas de Provocación Bronquial , Dióxido de Nitrógeno/farmacología , Ozono/farmacología , Hipersensibilidad Respiratoria/fisiopatología , Adulto , Resistencia de las Vías Respiratorias/fisiología , Asma/diagnóstico , Asma Inducida por Ejercicio/diagnóstico , Asma Inducida por Ejercicio/fisiopatología , Femenino , Volumen Espiratorio Forzado/efectos de los fármacos , Volumen Espiratorio Forzado/fisiología , Humanos , Pruebas Intradérmicas , Masculino , Hipersensibilidad Respiratoria/diagnóstico , Método Simple Ciego
8.
JACEP ; 8(9): 363-7, 1979 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-470279

RESUMEN

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.


Asunto(s)
Arteriopatías Oclusivas , Arteria Retiniana , Anciano , Arteriopatías Oclusivas/diagnóstico , Arteriopatías Oclusivas/etiología , Arteriopatías Oclusivas/fisiopatología , Arteriopatías Oclusivas/terapia , Femenino , Humanos , Masculino , Persona de Mediana Edad , Pronóstico , Arteria Retiniana/fisiopatología , Trombosis/complicaciones
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