1/15/2024 0 Comments Ameroid constrictor ringRadiographic angiography 2,15, scintigraphy 19, sonography 4, computed tomography angiography (CTA) 1,7,25, and magnetic resonance angiography 3 have been used to characterise portosystemic shunts in dogs. Portosystemic shunting occurs either as a single congenital shunt or as multiple acquired shunts due to chronic portal hypertension 11. Portosystemic shunts are anomalous vessels that join the portal and systemic venous circulation, allowing most of the portal blood to bypass the liver and enter the systemic circulation and are classified as intrahepatic or extrahepatic 2,13,17. Keywords: cellophane banding, contrast-enhanced computed tomography angiography, extrahepatic portosystemic shunt, volume-rendered imaging. Preprandial and postprandial bile acids were 25 and 12.5 µmol/ℓ, respectively (aforementioned respective reference ranges), 3 months post-surgery. CTA demonstrated an increased portal vein diameter (3.79-5.27 mm) measured at the level between the origin of the shunt and the porta of the liver. VRI revealed no evidence of portosystemic communication on the level of a cellophane band and caudal to the cellophane band. Follow-up single-phase CTA with VRI was obtained 10 weeks after surgery. Surgery was performed using cellophane banding without attenuation. CTA revealed a 3.66 mm-diameter shunt measured at the level of the termination of the shunt and a 3.79 mm-diameter portal vein measured at the level between the origin of the shunt and the porta of the liver. VRI revealed a portocaval shunt originating just cranial to a tributary of the gastroduodenal vein and draining into the caudal vena cava at the level of the epiploic foramen. Single-phase contrast-enhanced computed tomography angiography (CTA) with volume-rendered imaging (VRI) was obtained. Preprandial and postprandial bile acids were 44.2 and 187.3 µmol/ℓ, respectively (reference ranges 0-10 and 0-20 µmol/ℓ, respectively). Urinary calculi were composed of ammonium biurate. IVDepartment of Veterinary Surgery, College of Veterinary Medicine, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, KoreaĪ 4-year-old, 1.8 kg, male, castrated Maltese was presented for evaluation of urolithiasis. IIIDepartment of Physics and Astronomy and Center for Theoretical Physics, Seoul National University, Seoul 151-747, Korea IIVIP Animal Hospital, Seoul 130-840, Korea IDepartment of Veterinary Surgery, College of Veterinary Medicine, and the Veterinary Science Research Institute, Konkuk University, Seoul 143-701, Korea H Yoon I Y Choi II H Han III S Kim II K Kim IV S Jeong IV, * Findings suggested that veterinary surgeons can resterilize ameroid ring constrictors up to 10 times with confidence that ring properties would remain suitable for clinical use.CLINICAL COMMUNICATION KLINIESE MEDEDELINGĬontrast-enhanced computed tomography angiography and volume-rendered imaging for evaluation of cellophane banding in a dog with extrahepatic portosystemic shunt Overall closure rates for ameroid ring constrictors appeared to be unaffected by repeated gas sterilization up to 10 times. None of the ameroid ring constrictors had closed completely by day 27. Mean ± SD percentage of lumen closure for all groups of ameroid ring constrictors combined was 85.2 ± 1.6% at day 0 (prior to plasma incubation) and 95.4 ± 0.8% at day 27. A digital camera was used to obtain images of the constrictors prior to and at various points during incubation, and lumen diameter was measured. After sterilization, constrictors were incubated in canine plasma at a protein concentration of 3 g/dL for 27 days. Twenty-four 3.5-mm ameroid ring constrictors.Īmeroid ring constrictors were allocated to 1 of 4 treatment groups (6/group) to undergo gas sterilization 0, 1, 5, or 10 times. To determine the effect of repeated gas sterilization on rate of closure of ameroid ring constrictors in vitro.
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