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Radionuklidne tehnike

March 20, 2009

Radionuklidne tehnikeNuklearne tehnike omogućavaju analizu miokardne perfuzije i procenu postojanja vitalnog miokarda.

Primenjuju se kako za dijagnostikovanje koronarne bolesti, tako i za procenu funkcionalnog značaja stenoze otkrivene koronarografijom.

Kao inicijalna metoda, radionuklidne metode se primenjuju kod bolesnika sa srednjom verovatnoćom za postojanje koronarne bolesti, koji ne mogu da se podvrgnu fizičkom opterećenju ili imaju patološki elektrokardiogram EKG u bazalnim uslovima, kao što je blok leve grane Hissovog snopa, pace-maker, WPW sindrom ili ST depresiju veću od 1mm u miru.

Miokardni stres i kod ove tehnike može biti dinamički (fizičko opterećenje) ili farmakološki (vazodilatatori ili dobutamin).

Radioaktivni obeleživači se primenjuju intravenski i preuzimaju od strane vitalnih miocita i porede se slike u bazalnim uslovima i nakon primenjenog stresa. Kod normalnog miokarda obeleživač se ravnomerno preuzima i rasporedjuje. Perfuzioni defekti u miru i opterećenju (fiksni) ukazuju na postojanje ožiljka od ranije preležanog infarkta, dok defekt koji se vizuelizuje isključivo nakon primenjenog stresa (reverzibilni defekt) implicira postojanje ishemije.

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