IMUNA TROMBOCITOPENIJA IZAZVANA LEKOVIMA
Sažetak
Imuna trombocitopenija izazvana lekovima (ITIL) nastaje kao posledica destrukcije ili neadekvatne aktivacije trombocita usled dejstva imunog sistema provociranog trenutnim ili pređašnjim prisustvom leka u organizmu. Incidencija ITIL-a je oko 10 slučajeva na 1,000,000 stanovnika tokom jedne godine. Postoje četiri osnovna mehanizma nastanka ITIL-a: (1) vezivanje antitela zavisnih od lekova za trombocite; (2) blokada vezivanja fibrinogena za glikoproteinske IIb-IIIa receptore; (3) stvaranje autoantitela protiv trombocita koja nisu zavisna od prisustva leka; i (4) stvaranje imunih kompleksa lekova sa antitelima, što dalje dovodi do aktivacije trombocita i nastanka tromboza. Kod svih oblika imune trombocitopenije izazvane lekovima najvažnije je po utvrđivanju smanjenog broja trombocita što pre posumnjati da je uzročnik određeni lek. Ključni momenat u terapiji je prekid dalje primene leka-uzročnika, dok se transfuzija trombocita daje samo u slučaju ekstremnog pada njihovog broja u krvi. Heparinom-indukovana trombocitopenije je izuzetak, jer zahteva i lečenje tromboza pomoću direktnih inhibitora trombina.
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