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33rd Annual Scientific Meeting proceedings
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Session: STS and Oncology Short Communications
Date/Time: 06-07-2024 (17:00 - 17:15)
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Location: Auditorium 4
Efficacy of thin film banding for intrathoracic vascular attenuation in dogs
Scharf VF, McPhetridge JM, Nelson N
North Carolina State University, Raleigh, USA.
Objectives:
One fourth of portoazygous shunts in dogs terminate on the azygous vein within the thorax. Intrathoracic attenuation may improve visualization and ease of access to the terminal portion of the shunt. A previous clinical study, however, suggested that thin film banding may not effectively attenuate portosystemic shunts in the thorax. The objective of this study was to evaluate the ability of thin film banding to attenuate intrathoracic vasculature using the azygous vein as a model for portoazygous shunts.
Methods:
Five purpose-bred hounds were enrolled. Approval for the study was obtained by the Institutional Animal Care and Use Committee. All dogs underwent pre-operative thoracic computed tomography (CT) with intravenous contrast followed by thoracoscopic placement of a thin film band around the azygos vein. Contrast CT was performed at 3 and 6 months post-banding and thoracoscopy was repeated at 6 months post-banding. Three dogs underwent additional thoracoscopic visualization of the banding site at 15 months post-banding with intravenous indocyanine green (ICG) administration.
Results:
Fibrosis around the banding site was visualized on thoracoscopy in all dogs at 6 months post-banding. Contrast CT was unable to determine azygous vein patency at the thin film banding site at 3 and 6 months post-banding due to insufficient contrast filling of the small diameter of the azygos vein within the thin film band. Intravenous ICG administration in 2 of 3 dogs showed patency through the thin film band at 12 months and complete attenuation in one dog.
Conclusions:
Thin film banding does not provide consistent attenuation of intrathoracic veins.
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