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- W2263256566 abstract "Bronchoconstriction in asthmatic patients is frequently associated with gastroesophageal reflux. However, it is still unclear whether bronchoconstriction originates from the esophagus or from aspiration of the refluxate into the larynx and larger airway. We compared the effect of repeated esophageal and laryngeal instillations of HCl-pepsin (pH 1.0) on tracheal smooth muscle activity in eight anesthetized and artificially ventilated dogs. Saline was used as control. We used pressure in the cuff of an endotracheal tube (Pcuff) as a direct index of smooth muscle activity at the level of the larger airways controlled by vagal efferents. The Pcuff values of the first 60 s after instillations were averaged, and the difference from the baseline values was evaluated. Changes in Pcuff were significantly greater with laryngeal than with esophageal instillations ( P = 0.0166). HCl-pepsin instillation into the larynx evoked greater responses than did saline ( P = 0.00543), whereas no differences were detected with esophageal instillations. Repeated laryngeal exposure enhanced the responsiveness significantly ( P < 0.001). Our data indicate that the larynx is more important than the esophagus as a reflexogenic site for the elicitation of reflex bronchoconstriction in response to acidic solutions." @default.
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- W2263256566 date "1999-04-01" @default.
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- W2263256566 title "Larynx vs. esophagus as reflexogenic sites for acid-induced bronchoconstriction in dogs" @default.
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- W2263256566 doi "https://doi.org/10.1152/jappl.1999.86.4.1226" @default.
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