Radiographic and computed tomographic evaluation of experimentally induced lung aspiration sites in dogs

Abstract

This study was performed to radiographically examine the prevalence of aspiration sites and to evaluate their atomical correlation with the bronchial pattens. Ten healthy beagle dogs were repeatedly radiographed, at weekly intervals, in the left and right lateral, ventrodorsal (VD) and dorsoventral (DV) positions. Three mililiters of iohexol distilled with same volume of saline was infused into the tracheal inlet. Which lung lobe was aspirated was decided upon by the presence of a significant alveolar pattern due to the contrast medium. Alveolar patterns were identified at the left (100%) and right cranial lung lobes (77%) with the dogs in dependant lateral recumbency, at the right caudal lung lobe (71%) with the dogs in VD recumbency and at the right middle lung lobe (59%) with the dogs in DV recumbency, respectively. The anatomical correlation was evaluated by performing computed tomography. The right principal bronchus (165.8 ± 1.6°) was more straightly bifurcated than was the left principal bronchus (142.7 ± 1.8°, p < 0.01). In VD position, the right side lung had a greater opertunity to become aspirated. The ventrally positioned right middle lobar bronchial origin was more easily to be aspirated the other laterally positioned ones. We think that these anatomical characteristics can be one of the causes for aspiration pneumonia to occur more frequently in the right side lung.

Bronchial Vegetal Foreign Bodies in the Dog —Localization in 47 Cases

“…Likewise, foxtails inhalation/aspiration seems to show a seasonal incidence (mainly spring and summer), being elevated the time spent outdoors in such periods; also, in those dogs in which FBs were diagnosed in different periods, it was likely that the FBs were almost certainly present from that time (spring and summer) according to the owners' anamnestic reports. VFBs were mostly localized inside the right lung (Table 1) in our cases, as has been reported in other studies [2,5,8,10,11]; the more straight angle that is usually seen between the right principal bronchus/carina than left principal bronchus/ carina [6] may contribute to the prevalent distribution to the right lung. More precisely, 76.6% of FBs were found inside the segmental branches of the right main bronchus, and 23.4% were found inside the segmental branches of the left main bronchus.…”

Co‐infections with Respiratory Viruses in Dogs with Bacterial Pneumonia

“…On thoracic radiographs, an alveolar pattern in the cranial and the middle lobes was predominant in both groups without group predisposition. Radiographic findings in dogs with BP have been thoroughly reported previously for cases of aspiration etiology . In our study, radiographic findings in dogs with BP caused by other etiologies were similar to those reported for aspiration pneumonia.…”

A specific laryngeal finding in dogs with bronchial vegetal foreign bodies: a retrospective study of 63 cases

“…The breed predisposition is probably due to the intense outdoor exercise of hunting dogs during the spring/summer season, which increases their exposure to grass awns and consequently their risk of grass awn inhalation [2, 9, 12]. The anatomical characteristics of the canine right lung might be related to the higher prevalence of vegetal foreign body inhalation in this lung [7]. Specifically, at the carina level, the right principal bronchus bifurcates more straightly than the left bronchus, making it easier for inhaled foreign bodies to progress in that direction [7].…”

“…The anatomical characteristics of the canine right lung might be related to the higher prevalence of vegetal foreign body inhalation in this lung [7]. Specifically, at the carina level, the right principal bronchus bifurcates more straightly than the left bronchus, making it easier for inhaled foreign bodies to progress in that direction [7].…”