Biomarker least useful in diagnosis of myocardial re-infarction:
Answer: a) Troponin I
Diagnostic troponin elevations can be seen within six hours, but the values remain in diagnostic range for about two weeks. Hence diagnosis of re-infarction is difficult with troponin estimation. It will be preferable to look for re-elevation of CPK-MB in this situation.
Prof. Dr. Johnson Francis, MD, DM, FACC, FRCP Edin, Senior Consultant Interventional Cardiologist | Former Professor of Cardiology, Calicut Govt. Medical College