Modelo experimental de atelectasia em suínos recém-nascidos

Abstract

Background: there are few studies using animal models in chest physical therapy. However, there are no models to assess these effects in newborns. The objective of this study was to develop a model of atelectasis by bronchial obstruction in newborn pigs for the study of neonatal physiotherapy. Methods: 30 newborn pigs resulting from a cross-breeding between Large White and Landrace, properly sedated, anesthetized, tracheostomized, paralyzed and mechanically ventilated were used. Artificial mucus was instilled into the airways through an infusion pump 15 minutes after instrumentation. Radiological assessment of the lungs (in supine position) and blood gas analysis was performed 30 minutes after mucus infusion to confirm the production of atelectasis. Results: two radiologist not involved in this research analyzed X ray. The model showed consistent results between parameters of oxygenation and radiological analysis. The atelectasis model was successfully developed in over 70% of cases, surpassing 90% of attempts in the final phase of the study. Conclusions: this model of atelectasis showed results consistent enough to be tested in studies of chest physiotherapy techniques in newborns.