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Zespolenia wrotno-układowe – patofizjologia, diagnostyka, leczenie - Vetkompleksowo – serwis dla lekarzy weterynarii
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Wyszukaj w serwisie


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Zespolenia wrotno-układowe u psów – patofizjologia, diagnostyka, leczenie – cz. I


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Zespolenie wrotno-oboczne (ZWO), nazywane także krążeniem wrotno-­czczym, zostało opisane u ludzi, psów, kotów, świń, krów, koni, lwa, wilka oraz alpaki (13, 23). U psów występuje najczęściej jako wada wrodzona, lecz opisywane są również przypadki powstałe w wyniku chorób wątroby wtórnie do przewlekłego nadciśnienia wrotnego. Przyczyną schorzenia jest obecność pojedynczego lub wielu niefizjologicznych naczyń łączących krążenie wrotne z systemowym, przez co krew czynnościowa omija krążenie wątrobowe i płynie bezpośrednio do krwiobiegu dużego, co wywołuje u zwierzęcia objawy encefalopatii metabolicznej.

Fizjologicznie krew żylna z żołądka, śledziony, jelit oraz trzustki przedostaje się do żyły wrotnej i przepływa przez wątrobę, zanim dostanie się do żył wątrobowych oraz krążenia systemowego. W wątrobie z krwi usuwane są wchłonięte w układzie pokarmowym składniki odżywcze, toksyny oraz hormony jelitowe. Dodatkowo krew, bogata w substancje odżywcze, docierająca do wątroby przez żyłę wrotną, stymuluje ją do wzrostu.

ZWO może być zarówno zewnątrz- jak i wewnątrzwątrobowe, w zależności od lokalizacji niefizjologicznego naczynia. W przypadku krążenia zewnątrzwątrobowego naczynie odchodzi od żyły wrotnej lub jej dopływów przed jej wejściem do miąższu wątroby. Krążeniem wewnątrzwątrobowym nazywa się krążenie, w przypadku którego patologiczne naczynie odchodzi od dopływu żyły wrotnej zlokalizowanej wewnątrzwątrobowo. ZWO najczęściej występuje w postaci pojedynczego, rzadziej dwóch lub więcej patologicznych naczyń (ryc. 1). Tab. 1 przedstawia najczęściej opisywane ZWO u psów.

WWP_4_13_Marta_Plonek_PATOFIZJOLOGIA_DIAGNOSTYKA_LECZENIE_RYC_1 wrotno-
Ryc. 1. Najczęściej występujące zewnątrzwątrobowe połączenia wrotno-oboczne (28): a) [...]
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Mogą zainteresować Cię również


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Wizytówka firmy


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Sklep


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