Nephrology · Cardiology · Internal Medicine · 14 h ago
Long-form troponin T outperforms high-sensitivity assay in MI diagnosis
In a prospective emergency-department study of 1,811 patients with elevated high-sensitivity cardiac troponin T, researchers compared a long-form troponin T assay with the commercial assay across kidney-function levels. Long-form troponin T was less associated with kidney function and had better diagnostic performance for myocardial infarction, particularly at lower eGFR.
- Study included 1,811 emergency-department patients with elevated hs-cTnT.
- Long-form cTnT showed no consistent association with eGFR.
- Diagnostic advantage over hs-cTnT increased at lower eGFR.
- Abstract does not report external validation or detailed performance estimates.
This prospective study included 1,811 consecutive emergency-department patients with high-sensitivity cardiac troponin T (hs-cTnT) of at least 14 ng/L. Researchers measured long-form cTnT—intact or mildly fragmented troponin—and hs-cTnT on admission. Kidney function was assessed using creatinine, cystatin C, and combined equations. The diagnostic endpoints were type 1 myocardial infarction and any myocardial infarction; 205 patients (11.3%) had an MI, and 204 (11.3%) had a history of chronic kidney disease.
Among patients without MI, hs-cTnT concentrations were inversely associated with eGFR across all three equations (all P<0.001). Long-form cTnT showed no consistent association with kidney function. Its diagnostic performance for MI was superior to hs-cTnT (P<0.001), with the advantage increasing as eGFR decreased, regardless of the equation used.
The findings suggest long-form cTnT may be less affected by reduced kidney function when evaluating suspected MI. However, the study enrolled patients already meeting an elevated hs-cTnT threshold, and the supplied abstract does not provide performance estimates or details on external validation. The results alone do not establish that the assay should replace current testing.
In practice
In emergency-department patients with hs-cTnT at or above 14 ng/L, long-form cTnT had better diagnostic performance for MI than the commercial hs-cTnT assay, with a larger advantage at lower eGFR. This may be relevant when interpreting troponin results in patients with impaired kidney function. The evidence is from one prospective cohort selected for elevated hs-cTnT; the supplied abstract gives no detailed accuracy estimates or external validation, so it does not establish a basis for changing testing practice.
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Nephrology Dialysis Transplantation: Long forms of cardiac troponin T are independent of kidney function and improve the diagnosis of myocardial infarction ↗This is an automated AI-condensed summary that has not yet been reviewed by an editor. Always consult the full item at the original source.