Produção Nacional
Revisado por pares
Pulmonary responses to tracheal or esophageal acidification in guinea pigs with airway inflammation
2002; American Physiological Society; Volume: 93; Issue: 3 Linguagem: Inglês
10.1152/japplphysiol.00013.2002
ISSN8750-7587
AutoresFernanda Degobbi Tenório Quirino dos Santos Lopes, Glauco S. Alvarenga, Raquel Quiles, Mayra Dorna, Joaquim Edson Vieira, Marisa Dolhnikoff, Mílton A. Martins,
Tópico(s)Respiratory Support and Mechanisms
ResumoThe association between asthma and gastroesophageal reflux has been attributed to microaspiration of gastric contents and/or vagally mediated reflex bronchoconstriction. In previous experimental studies concerning the pulmonary effects of tracheal or esophageal acid infusion, only animals without airway inflammation have been studied. We assessed the effects of esophageal and tracheal administration of hydrochloric acid (HCl) on normal guinea pigs (GP) and GP with airway inflammation induced by repeated ovalbumin exposures. These GP were anesthetized (pentobarbital sodium) and received 1) 20 microl of either 0.2 N HCl or saline into the trachea, or 2) 1 ml of either 1 N HCl or saline into the esophagus. Intratracheal HCl resulted in a significant increase in both respiratory system elastance and resistance (P < 0.001). There were no significant changes in respiratory mechanics when HCl was infused into the esophagus. In conclusion, we observed that infusion of large volumes of HCl into the esophagus did not change pulmonary mechanics significantly, even in guinea pigs with chronic allergen-induced airway inflammation. In contrast, intratracheal administration of small amounts of acid had substantial effects in normal GP and GP with airway inflammation.
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