Hyper acute rejection is due to:: (A) Preformed antibodies, (B) Cytotoxic T-lymphocyte medicated injury, (C) Circulating macrophage mediate injury, (D) Endothelitis caused by donor antibodies
Answer is A. Ans. (a) Preformed antibodiesRef: Bailey 26th edition, Page 1412* Hyperacute happens in minutes to hours due to preformed antibodies.