In vitro expansion patterns of ameroid ring constrictors

Leshem, Steven S.; Lotsikas, Peter J.; Reimer, S. Brent

doi:10.2460/ajvr.69.11.1520

Cited by 8 publications

(13 citation statements)

References 14 publications

(34 reference statements)

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“…A cellophane band and ameroid ring constrictor have been described to be effective for slow occlusion of portosystemic shunts (Hunt et al 2004;Frankel et al 2006;Leshem et al 2008). The cellophane band and banding technique described in the case reported here were the same as in a previous case report where computed tomography angiography demonstrated no evidence of portosystemic communication on the level of the cellophane band and caudal to the cellophane band (Yoon et al 2011).…”

Section: Discussionsupporting

confidence: 58%

Surgical correction of a splenophrenic shunt in a dog: a case report

Yoon¹,

Roh²,

Jeong³

2014

Vet. Med. - Czech

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A 4.3 kg, nine-year-old, spayed female Shih Tzu was presented for a two-month history of seizures, ataxia, and hyper-salivation. A diagnosis of a splenophrenic shunt was made by use of computed tomography angiography with volume-rendered imaging. A cellophane band was placed around the shunt after its isolation from the central tendon of the diaphragm. Clinical signs continued to wax and wane. Preprandial and postprandial bile acids levels were still elevated 10 months after surgery. An ameroid ring constrictor was placed around the shunt vessel before the vessel entered the diaphragm from its caudal aspect. At three months after the second surgery, the dog was near the normal ranges of preprandial and postprandial bile acids. Although a study of the anatomy of different types of extrahepatic portosystemic shunts has been reported in dogs, to the authors' knowledge, there is a lack of information on clinical presentation, treatment, and postoperative results in a specific type of extrahepatic portosystemic shunt, such as a splenophrenic shunt. Cellophane banding should be avoided for occlusion of a splenophrenic shunt passing along the central tendon of the diaphragm.

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Section: Discussionsupporting

confidence: 58%

Surgical correction of a splenophrenic shunt in a dog: a case report

Yoon¹,

Roh²,

Jeong³

2014

Vet. Med. - Czech

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“…ACs were positioned within a ring of stainless steel, and then placed around the right renal arteries of dogs. After the AC is surgically placed around a blood vessel, the ameroid slowly absorbs fluid, expands and the diameter of the central cylindrical ring lumen gradually reduces in size [19]. It has been hypothesized that the complete vascular occlusion observed after placement of the AC on a vascular district may be the result of both physical expansion and an inflammatory response to the ameroid [19]–[20].…”

Section: Discussionmentioning

confidence: 99%

Quantitative Evaluation of Contrast-Enhanced Ultrasonography in the Diagnosis of Chronic Ischemic Renal Disease in a Dog Model

Wang

Cao

et al. 2013

PLoS ONE

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ObjectivesThe aim of this feasibility study was to prospectively explore in a dog model of chronic ischemic renal disease (CIRD) the hypothesis that real-time contrast-enhanced ultrasonography (CEUS) can quantitatively evaluate the early perfusion changes of renal cortex.Materials and MethodsIn this animal care and use committee-approved study, the model of CIRD was carried out in healthy dogs (10.0∼12.0 kg, n = 5), by placing the Ameroid ring constrictors on the distal portion of right renal artery through operation. CEUS monitoring of right kidney perfusion was performed by intravenous bolus injection of 0.6 ml Sulfur hexafluoride filled microbubbles (SonoVue; Bracco S.P.A., Milan, Italy) every week after operation. The slope rate of ascending curve (A) and descending curve (α), area under curve (AUC), derived peak intensity (DPI), and time to peak (TTP) were measured in renal cortex using commercial quantification software (Q-LAB version 6; Philips Medical Systems, Bothell,WA,USA). The sensitivity of CEUS was compared with blood serum urea nitrogen (BUN) and serum creatinine (SCr) level.ResultsWith the progression of CIRD, dogs showed delayed enhancement and perfusion in renal CEUS curve. Earliest significant changes happened 4 weeks after operation on DPI and TTP which changed from 13.04±2.71 to 15.58±4.75 dB and 9.03±2.01 to 10.62±6.04 sec, respectively (P<.05).ConclusionsCEUS can display the perfusion changes of CIRD in the early period.

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“…The ameroid constrictor (AC) is used widely for attenuation of congenital portosystemic shunts (CPS) in dogs . Despite early contention that shunt attenuation after AC placement resulted primarily from inward compression of the shunt vessel by the encircling ameroid clay, some experimental studies show that the reduction in the luminal diameter is often minimal, and occlusion of blood vessels within an AC is due equally to inflammation and thrombosis . Other studies show the protein concentration of fluid surrounding the AC may have an impact on the degree of expansion of the ameroid clay, and that coating the AC with petrolatum does not affect the rate or degree of expansion .…”

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confidence: 99%