Which one of the following molecules serve as the earliest marker in myocardial infarction: (A) Myoglobin, (B) Troponin, (C) HbA2, (D) CK MB
Answer is A. Myoglobin is found in cardiac and skeletal muscle. It is released more rapidly from infarcted myocardium than troponin and CK-MB and may be detected as early as two hours after an acute myocardial infarction. Ref: Biochemistry by U. Satyanarayana 3rd edition Pgno : 107-112