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Krążenie wrotno-oboczne – wskazania dietetyczne dla pacjentów - Vetkompleksowo – serwis dla lekarzy weterynarii
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Wyszukaj w serwisie


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Krążenie wrotno-oboczne – wskazania dietetyczne dla pacjentów


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Zespolenie wrotno-oboczne – objawy kliniczne, konsekwencje zdrowotne

Wątroba jest kluczowym narządem, który uczestniczy w metabolizmie wszystkich substancji odżywczych: białek, tłuszczów i węglowodanów. Pełni funkcję magazynu oraz uczestniczy w procesach detoksykacji szeregu związków. Niemniej jednak jej uszkodzenie (mechaniczne, pozapalne itd.) lub wady wrodzone mogą w znaczący sposób przyczyniać się do pogorszenia spełnianych przez nią funkcji. Jedną z istotnych anomalii naczyniowych, która w znaczący sposób wpływa na proces detoksykacji endogennych metabolitów w wątrobie, jest zespolenie wrotno-oboczne (PSS, ang. portosystemic shunt). Jest to nieprawidłowe połączenie pomiędzy układem żyły wrotnej a krążeniem ogólnoustrojowym, omijające miąższ wątroby. Prowadzi do wystąpienia hiperamonemii, a po przekroczeniu przez amoniak bariery krew – mózg – objawów encefalopatii wątrobowej (HE, ang. hepatic encephalopathy). PSS może mieć charakter wrodzony lub nabyty, zewnątrz- lub wewnątrzwątrobowy. Postać wrodzona zewnątrzwątrobowa (ECPSS, ang. extrahepatic congenital portosystemic shunt) jest diagnozowana zwykle u psów ras małych (np. maltańczyk, Yorkshire terrier, lhasa apso, pudel itd.), natomiast wewnątrzwątrobowa (ICPSS, ang. intrahepatic congenital portosystemic shunt) występuje częściej u psów raz dużych (np. wilczarz irlandzki, labrador retriever) (16). Przyczyny ECPSS upatruje się w zaburzeniach rozwojowych naczyń na etapie embriogenezy, natomiast wystąpienie ICPSS jest wynikiem wzrostu ciśnienia krwi w żyle wrotnej spowodowanym przewlekłym stanem zapalnym wątroby, jej marskością, niedrożnością żyły wrotnej czy chorobą dróg żółciowych. PSS jest rzadko diagnozowany u kotów, niemniej jednak opisuje się go u przedstawicieli ras: perskiej, himalajskiej i brytyjskiej (27).

Objawy kliniczne są typowe dla encefalopatii wątrobowej, obserwuje się: apatię, drżenia, [...]

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Mogą zainteresować Cię również


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Wizytówka firmy


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Sklep


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