Irreversible injury to myocardium in MI occurs earliest by: (A) Few seconds, (B) 10 minutes, (C) 20 minutes, (D) 40 minutes
Answer is C. Answer- C. 20 minuteshlyocardial function is more seflsith'e to kchemia (loss of contractility occurs within 60 seconds) than myocardial structure(irreversible injury occurs in 2O-40 minutes), thus myocardial necrosis begins at approximately 30 minutes after coronary occlusion