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Zespoły paraneoplastyczne - hiperkalcemia i hiperglobulinemia
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Wyszukaj w serwisie


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Zespoły paraneoplastyczne (paranowotworowe) u pacjenta onkologicznego w praktyce weterynaryjnej. Cz. II – hiperkalcemia i hiperglobulinemia


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Hiperkalcemia

Najczęstszą przyczyną hiperkalcemii u psów (około 60%) są choroby nowotworowe, które odpowiadają za powstanie tzw. hiperkalcemii paraneoplastycznej. Szacuje się, że u około 2/3 psich pacjentów z hiperkalcemią będzie ona wynikiem procesu nowotworowego, oraz u około 2/3 tychże pacjentów będzie ona wywołana przez chłoniaka. U znacznej większości pacjentów hiperkalcemia jest powiązana ze złym rokowaniem długoterminowym. W przypadku kotów najczęściej występującą hiperkalcemią jest hiperkalcemia o podłożu idiopatycznym. Hiperkalcemia wtórna do procesu nowotworowego występuje u około 30% kotów (1-6). Hiperkalcemia opisana w tym artykule będzie dotyczyła głównie psów.

Mechanizm hiperkalcemii

Wapń w surowicy występuje w trzech frakcjach: związanej z białkami, złożonej (w połączeniu z: fosforem, cytrynianem, siarczanem, mleczanem, dwuwęglanem) oraz zjonizowanej (7). Zjonizowany wapń stanowi ponad 50% wapnia surowicy i ta forma jest najbardziej biologicznie czynną postacią wapnia. Zjonizowany wapń odgrywa bardzo ważną rolę w organizmie, jest kofaktorem wielu enzymatycznych reakcji, reguluje zewnątrz- oraz wewnątrzkomórkowe przekaźnictwo. Ze względu na to, jak ważną rolę pełni wapń zjonizowany w organizmie, jego stężenie jest bardzo precyzyjnie regulowane, a jego głównymi regulatorami są witamina D, parathormon (PTH) oraz kacytonina. Nieprawidłowe stężenie wapnia zjonizowanego w surowicy jest czułym wskaźnikiem patologicznych stanów w organizmie (8, 9).

Pierwotny mechanizm hiperkalcemii polega na promowaniu resorpcji kości przez osteoklasty, w wyniku czego dochodzi do uwolnienia wapnia do krwi. Tak jak na przykład w pierwotnej nadczynności przytarczyc, w której [...]
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Mogą zainteresować Cię również


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Wizytówka firmy


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Sklep


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