Med. Pro Praxi 2007; 4(11): 478-480

Systémová nefrogenní fibróza a kontrastní látky používané v magnetické rezonanci

doc. MUDr. Josef Vymazal DSc
Radiodiagnostické oddělení, Nemocnice Na Homolce, Praha

Systémová nefrogenní fibróza (SNF) popsaná poprvé v roce 1997 u pacientů s renální insuficiencí postihuje různé orgány – kůži, ledviny, srdce, játra a plíce. Onemocnění bývá invalidizující, může být i letální. V posledních letech je SNF dávána do souvislosti s podáním (zvláště některých) chelátů gadolinia, používaných jako kontrastní látky u magnetické rezonance. Pravděpodobným mechanizmem vzniku SNF u těchto látek je nízká stabilita některých chelátů, kdy dojde k uvolnění toxického gadolinia. Tento mechanizmus je možný zvláště u pacientů s poruchou funkce ledvin, kdy eliminace kontrastní látky je prodloužena z řádově 1–2 hodin i na desítky hodin. Uvolněné gadolinium je pak nahrazeno v chelátu jiným kovem. Jde o tzv. transmetalaci. Druhý mechanizmus vychází z přítomnosti nadbytečného chelátu v nestabilních kontrastních látkách. Tento chelát vychytává kovy tělu vlastní, např. Zn. U pacientů s hodnotami glomerulární filtrace pod 30 ml/min na 1,73 m2 (přibližně kreatinin 200 μmol/l) jsou kvůli riziku rozvoje SNF v současné době kontraindikovány kontrastní látky gadodiamide a gadopentate.

Keywords: systémová nefrogenní fibróza, magnetická rezonance, kontrastní látka, gadolinium

Published: December 19, 2007  Show citation

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Vymazal J. Systémová nefrogenní fibróza a kontrastní látky používané v magnetické rezonanci. Med. praxi. 2007;4(11):478-480.
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