Małopłytkowość indukowana protaminą — nowy problem czy inny typ małopłytkowości poheparynowej?
Streszczenie
Protamina jest powszechnie stosowanym środkiem odwracającym antykoagulacyjne działanie heparyny niefrakcjonowanej, szczególnie po zabiegach kardiochirurgicznych. Najnowsze badania wskazują, że część pacjentów poddanych zabiegowi krążenia pozaustrojowego jest narażona na trombocytopenię w trakcie ekspozycji na heparynę. Wielkocząsteczkowe kompleksy protaminy i heparyny wywołują immunizację i produkcję immunoglobulin G, które aktywują płytki krwi za pośrednictwem receptora FcγIIa. Podczas krążenia pozaustrojowego infuzja protaminy u niektórych pacjentów zwiększa ryzyko wczesnych powikłań zakrzepowych, spowodowanych obecnością tych przeciwciał we krwi. W niniejszym przeglądzie skupiono się na pracach, w których przebadano mechanizm aktywacji płytek krwi przez anty-protaminowo-heparynowe przeciwciała. Porównano je z przeciwciałami wywołującymi immunologiczną małopłytkowość poheparynową. Ponadto opisano kliniczne konsekwencje trombocytopenii indukowanej protaminą, czynniki ryzyka i ogólne wytyczne dotyczące terapii powikłań zakrzepowo-zatorowych u pacjentów kardiochirurgicznych.
Słowa kluczowe: protaminaheparynatrombocytopenia
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