Jun 27, 2016 · Two of the most common methods of slowly attenuating congenital portosystemic shunts in dogs and cats are cellophane banding and ameroid ring constrictors. These modalities are similar in that they both aim to slowly cause attenuation of the portosystemic shunt vessel in order to avoid complications such as portal hypertension and development ...

May 1, 2002 · Objective: To document the signalment; history; clinical signs; clinicopathologic, diagnostic imaging, and surgical findings; perioperative complications; and long-term clinical results of ameroid ring constrictor (ARC) placement …

The ACD was originally used in research models before we adapted it for use for PSS in dogs and cats. The ACD is made of hydroscopic casein material and has a stainless steel jacket. A small notch in the constrictor ring is made to allow its placement over the shunt vessel.

An ameroid constrictor is an inner ring of casein that is surrounded by a stainless steel sheath. Casein is a hygroscopic substance that swells as it slowly absorbs body fluid. The stainless steel sheath forces the casein to swell inwardly, eventually closing the ring and obliterating the shunt.

Attenuation of the CPSS is the treatment of choice and may be performed by open surgical intervention using ameroid ring constrictors, thin film banding, and partial or complete suture ligation or by percutaneous transvenous coil embolization.

Any cat that can tolerate a complete acute CPSS attenuation (suture or cellophane band) can benefit from this, instead of receiving a gradual, possibly incomplete, CPSS attenuation. Ameroid constrictors. Ameroid constrictors consist of a ring of casein with a lumen, surrounded by a stainless steel collar.

Objective—To document the signalment; history; clinical signs; clinicopathologic, diagnostic imaging, and surgical findings; perioperative complications; and long-term clinical results of ameroid ring constric-tor (ARC) placement on single extrahepatic portosys-temic shunts (PSS) in cats. Design—Retrospective study.

A special constricting device called the Ameroid Ring is used to occlude the problem blood vessel to the liver. The ameroid ring is made of casein (a type of protein) that is surrounded by a ring of stainless steel. Over 4-5 weeks the normal fluid in the abdomen causes the casein to swell.

Dec 28, 2023 · To report the clinical perioperative, short-term, and long-term outcomes for cats undergoing ameroid ring constrictor (ARC) attenuation of a congenital extrahepatic portosystemic shunt (EHPSS). Retrospective case series from a single veterinary teaching hospital (2002–2020). Twenty client-owned cats with EHPSS.

The ameroid constrictor (Figure 6, 7) is made of casein in a stainless steel, “C”-shaped ring. It is placed around the shunt, and the ring is closed with a small key. Over the next few weeks, the casein swells and gradually occludes the shunt (Figure 7).