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- W2116925818 abstract "We developed an experimental dog preparation that shows a biphasic bronchoconstriction after allergen exposure. After anesthetization, the dogs were intubated with endotracheal tubes and manually ventilated. Respiratory resistance (Rrs) was measured by the forced oscillation method at 3 Hz. Ascaris suum, diluted from 10−5 to 10−2 of the extract, was inhaled during tidal breathing for 5 min. One hour before antigen challenge, 10 dogs received 70 mg/kg of metyrapone (cortisol synthesis inhibitor), and 2 h after antigen challenge 35 mg/kg of metyrapone were injected intravenously. In another 10 dogs, metyrapone was not administered. After the maximal increase in Rrs had been assessed (immediate asthmatic response), Rrs increased again 4 to 6 h after antigen challenge in 8 of the 10 dogs treated with metyrapone (late asthmatic response, 443 ± 282% mean ± SD of initial Rrs), which was significantly higher than Rrs 6 h after antigen challenge (124 ± 41%) in dogs without metyrapone (p < 0.01). In another 5 dogs, ragweed challenge with metyrapone caused no change in Rrs. Bronchoalveolar lavage at the time of the late response revealed a significant correlation between late asthmatic response and neutrophil accumulation (p < 0.01) in all dogs. We conclude that cortisol depletion augments the occurrence of the late response. The present dog model may be a useful tool for study of the late response in bronchial asthma." @default.
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- W2116925818 date "1987-12-01" @default.
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- W2116925818 title "Late Asthmatic Response to<i>Ascaris</i>Antigen Challenge in Dogs Treated with Metyrapone" @default.
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- W2116925818 doi "https://doi.org/10.1164/ajrccm/136.6.1459" @default.
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