Persistent isolated hs-troponin I elevation with normal ECG, echocardiogram, and no symptoms
I am an 18-year-old male who has been doing regular resistance training for about three years. I had no chest pain, shortness of breath, palpitations, reduced exercise tolerance, or other cardiac symptoms.
A high-sensitivity troponin I elevation was found unexpectedly during routine blood testing. The initial result was approximately 7 times the laboratory’s upper reference limit. I was admitted for observation and underwent several ECGs, two echocardiograms, and a chest X-ray. All were reported as normal. My ejection fraction was around 72%, and no structural or functional cardiac abnormality was found.
After stopping exercise completely, my troponin I decreased only slightly over one week, from roughly 7 times to 6 times the upper reference limit. The values are not showing a clear rise-and-fall pattern and have remained close to the same range for several days. I still have no symptoms. My CRP, kidney function, CK, and liver enzymes are currently normal.
The pediatric cardiologists I have seen initially considered mild myocarditis or exercise-related elevation, but later felt myocarditis was unlikely because the ECGs, echocardiograms, chest X-ray, and clinical examination were all normal. Their current plan is simply rest and repeat testing.
I would appreciate opinions on what possibilities should be considered in a case like this. In particular:
- Can exercise or infection related troponin elevation remain around 6–7 times the upper reference limit for more than a week after stopping training?
- Could mild or focal myocarditis still cause this pattern despite normal ECG and echocardiography?
Should assay interference or macrotroponin I be investigated? (asking this since I've found some articles about these cases)
Would measuring hs-troponin T on a different platform, repeating troponin I testing or cardiac MRI be reasonable next steps?
I am mainly trying to understand what further evaluation would be appropriate rather than repeatedly measuring the same troponin I assay and waiting indefinitely.
Note: I dont have any single medical problem except troponin levels