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Tomografia komputerowa w diagnostyce zespoleń wrotno-czczych
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Wyszukaj w serwisie


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Tomografia komputerowa w diagnostyce zespoleń wrotno-czczych u psów


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Żyła wrotna jest dla wątroby naczyniem czynnościowym, w odróżnieniu od tętnicy wątrobowej, która pełni funkcję naczynia odżywczego. Około 2/3 krwi dostarczanej do wątroby jest właśnie drogą żyły wrotnej, która zbiera krew z obszaru jelit, żołądka, śledziony i trzustki. W wyniku zaburzeń rozwojowych żył żółtkowych, które w okresie płodowym łączą żyłę wrotną z żyłą główną doogonową, może dojść do powstania wrodzonych zespoleń wrotno-czczych. Choroba najczęściej spotykana jest u psów ras małych i miniaturowych, takich jak: shih-tzu, pudel, maltańczyk, yorkshire terrier. Predysponowanymi rasami kotów do występowania PSS są koty brytyjskie, perskie oraz himalajskie. Obecność nieprawidłowego naczynia, poprzez które krew z obszaru przewodu pokarmowego trafia bezpośrednio do krążenia systemowego, zwanego krążeniem wrotno-czczym lub wrotno-obocznym, skutkuje rozwojem encefalopatii wątrobowej, podwyższonym poziomem kwasów żółciowych, hipoglikemią oraz wieloma innymi zaburzeniami metabolicznymi (2, 5, 6, 7, 9).

Dla właściwego rozpoznania nieprawidłowości naczyniowych układu żyły wrotnej warto przypomnieć anatomię prawidłową. Żyła wrotna jest naczyniem stosunkowo krótkim, o szerokim świetle. Według danych literaturowych jej prawidłowa średnica u psów zdrowych wynosi 5-10 mm, pozostając w zależności od wielkości psa. Opracowano wskaźniki określające stosunek średnicy żyły wrotnej (PV, ang. portal vein) do średnicy żyły głównej doogonowej (CVC, ang. caudal caval vein). U zwierząt z obecnym zespoleniem wrotno-czczym zewnątrzwątrobowym PV/CVC < 0,65, natomiast PV/CVC > 0,8 wskazuje na znikome prawdopodobieństwo występowania PSS. Naczynia żylne, które tworzą żyłę wrotną, to: żyła krezkowa doogonowa, żyła krezkowa doczaszkowa, żyła żołądkowo-dwunastnicza oraz żyła śledzionowa. Najbardziej doogonowa, żyła krezkowa doogonowa, powstaje w wyniku połączenia żyły odbytniczej doczaszkowej i [...]

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Mogą zainteresować Cię również


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Wizytówka firmy


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Sklep


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