Which statement about high-sensitivity troponin (hs-cTnT/cTnI) in the diagnosis of NSTEMI is most accurate?
- A A single hs-cTnI below the 99th percentile at 0 hours rules out NSTEMI with 100% sensitivity
- B Elevated hs-cTnT is specific for myocardial necrosis and cannot be elevated in renal failure
- C The 0h/1h rapid rule-out algorithm uses absolute delta change thresholds in addition to baseline values ✓
- D hs-cTnI begins to rise 12-24 hours after myocardial injury, making early testing unreliable
Correct answer: C. The 0h/1h rapid rule-out algorithm uses absolute delta change thresholds in addition to baseline values
Explanation
The ESC 0h/1h rapid rule-out/rule-in algorithm for hs-cTnT or hs-cTnI uses both absolute baseline values AND absolute delta changes at 1 hour (e.g., delta hs-cTnT < 5 ng/L over 1 hour for rule-out). A single baseline below the 99th percentile alone does not achieve sufficient sensitivity to rule out NSTEMI — the delta is essential. Hs-cTn rises within 1-3 hours of myocardial injury (not 12-24 hours), and it can be chronically elevated in CKD, myocarditis, and heart failure without acute NSTEMI.
Reference: Harrison's Principles of Internal Medicine, 21st ed.
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