Myocardial injury is common in medical inpatients with sepsis, anaemia, renal impairment, pulmonary embolism, tachyarrhythmia or heart failure. A single raised troponin in these settings usually reflects supply-demand mismatch or direct injury rather than a type 1 myocardial infarction from plaque rupture.
The diagnosis rests on the clinical picture and on a rise or fall between serial measurements, plus symptoms, ECG changes or imaging. Labelling every raised troponin as a myocardial infarction leads to unnecessary antiplatelet therapy and bleeding risk; missing the real one is the opposite error.
- Repeat the troponin to look for a rise or fall rather than acting on a single value.
- Look for the underlying driver: sepsis, anaemia, tachycardia, hypoxia or pulmonary embolism.
- Check the ECG and ask about ischaemic symptoms before starting antiplatelet therapy.
- Document whether you judge it myocardial injury or myocardial infarction, and why.
Why it matters
Mislabelled injury drives antiplatelet treatment and bleeding in patients who never had a coronary event.
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