Troponin
Elevated troponin means myocardial injury — not automatically myocardial infarction.
Injury is not the same as infarction
Troponin is released with cardiomyocyte injury. MI requires evidence that the injury is ischemic, not just a positive biomarker.
Trend it
A rise/fall supports acute injury; a persistently elevated stable value can reflect chronic myocardial injury. Interpret the trajectory with the assay and clinical timing.
Ask why the myocardium is injured
Type 1 MI involves acute coronary atherothrombosis — typically plaque rupture or erosion. Type 2 MI requires evidence of acute myocardial ischemia from oxygen supply–demand imbalance (e.g., tachyarrhythmia, severe hypotension, or significant anemia causing ischemia). Sepsis, PE, myocarditis, HF, renal disease, and other non-ischemic processes cause myocardial injury — not Type 2 MI — unless acute ischemia is also present.
The ECG + symptoms change the meaning
Chest discomfort, ischemic ECG changes, new wall-motion abnormality and the clinical syndrome determine whether an elevated troponin represents acute MI. STEMI and NSTEMI describe ECG presentation; Type 1 and Type 2 describe mechanism — these are separate distinctions.
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