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ANELI, E. Evaluation of position’s effects related to gravitacional pulmonary dependent densities in dogs (Canis familiaris) by computed tomography. [Avaliação dos efeitos do posicionamento relacionados à opacificação pulmonar gravitacional dependente em cães (Canis familiaris) através da tomografia computadorizada]. 2005. 123 f. Dissertação (Mestrado em Medicina Veterinária) – Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, 2005. Computed tomography (CT) is a diagnostic method of election to the lungs evaluation. However, the pulmonary atelectasis or gravitacional dependent pulmonary densities, wich is observed during general anesthesia or long-term of recumbency, could increase the risk of obscuring pulmonary lesions, such metastasis. The aim of this study was to compare the recumbency effect ́s (supine and prone), by CT, on the formation of pulmonary densities in anesthetized dogs. Sixteen healthy Rottweiler dogs (Canis familiaris) were used. These dogs were divided into four groups, wich performed dorsal and prone CT exams each, with differents periods of anesthesia: immediately after induction, 20 minutes after induction, 40 minutes and 60 minutes after induction. There were performed four transverse CT scans, in differents sites of the chest. There were determined mean lung density (sector method), pulmonary densities in Hounsfield units (HU) and area in cm2 of dense areas in dependent lung regions. Mean lung density was demonstrated that the supine recumbency had a significant density gradient from nondependent to dependent lung regions, and the prone position hadn ́t any density gradient. Dense areas were observed in 43,75% of dogs in supine recumbency and in 18,75% of dogs in prone recumbency. Atenuation was between – 43,47 to – 361,94 HU in both recumbencies. Area was between 0,03 to 1,55 cm2 in supine position, and 0,24 to 0,70 cm2 in prone position.

Avaliação dos efeitos do posicionamento relacionados à opacificação pulmonar gravitacional dependente em cães (Canis familiaris) através da tomografia computadorizada