Influences of Anesthetics in term of Computed Tomography Bronchial Lumen to Pulmonary Artery Diameter Ratio in Beagle Dogs

비글견의 컴퓨터단층영상에서 기관내강과 폐동맥 직경비율의 마취제에 따른 영향평가

Bronchoarterial (BA) ratio is a commonly used criterion to define airway dilatation despite the lack of normative human and animals. The objective of our study was to compare the range of normal bronchial to accompanying arterial diameter ratio with previous reports on CT scan of the thorax in dogs and assess influence anesthetics on BA ratio in dogs. Dogs undergoing multidetector CT scan of the chest for nonpulmonary conditions at a single center were prospectively identified. High-resolution reconstruction was performed on those included and both airway lumen and vessel diameters were measured in the lobar bronchi of the left cranial (cranial and caudal parts), right cranial, right middle, left caudal, and right caudal lung lobes. Eight dog were included; Mean of the mean BA ratios was $1.43{\pm}0.24$ (95% CI = 1.36 - 1.50) in inhalation anesthetic group. In propofol group, the mean of the mean BA ratios was $1.13{\pm}0.29$ (95% CI = 1.04 - 1.22). In medetomidine group, the mean of the mean BA ratios was $0.89{\pm}0.19$ (95% CI = 0.83 - 0.95). Comparing individual lobes within anesthetic category, there was no signicant difference in mean BA ratio between lung lobes or between dog according to inhalation, propofol, and medetomidine group (P = 0.630, P = 0.878, and P = 0.508, respectively). The BA ratio in these clinically normal dogs was consistent and may be a useful tool in evaluating for bronchiectasis on CT images. However, some different criteria for bronchiectasis were applied by the anesthetic methods.