Associations Between Biomarkers of Myocardial Injury and Systemic Inflammation and Risk of Incident Ventricular Arrhythmia.

BACKGROUND

Cardiac troponins (cTns) and biomarkers of inflammation are elevated in heart failure (HF) and predict cardiovascular risk. Whether these biomarkers associate with risk of ventricular arrhythmias (VAs) is unclear.

OBJECTIVES

This study sought to assess whether cTnT, growth differentiation factor 15 (GDF-15), interleukin-6 (IL-6), and C-reactive protein (CRP) concentrations are associated with incident VA.

METHODS

In a prospective, observational study of patients treated with implantable cardioverter-defibrillator, cTnT, GDF-15, IL-6, and CRP were measured at baseline and after 1.4 ± 0.5 years and were associated with implantable cardioverter-defibrillator-detected incident VA, HF hospitalizations, and mortality.

RESULTS

This study included 489 patients aged 66 ± 12 years and 83% were men. Median concentrations of cTnT were 15 (Q1-Q3: 9-25) ng/L at inclusion, and higher concentrations were associated with higher age, male sex, diabetes mellitus, coronary artery disease, and HF. During 3.1 ± 0.7 years of follow-up, 137 patients (28%) had ≥1 VA. cTnT concentrations were associated with an increased VA risk (per log-unit, HR: 1.63; 95% CI: 1.31-2.01; P < 0.001), also after adjustment for age, sex, body mass index, coronary artery disease, HF, renal function, and left ventricular ejection fraction (P < 0.001). GDF-15, IL-6, and CRP concentrations were not associated with incident VA, but all (including cTnT) were associated with HF hospitalization and mortality. Changes in cTnT, GDF-15, IL-6, and CRP from baseline to 1.4 years were not associated with subsequent VA.

CONCLUSIONS

Higher concentrations of cTnT, GDF-15, IL-6, and CRP associate with HF hospitalization and death, but only cTnT predict incident VA. These findings suggest that myocardial injury rather than inflammation may play a pathophysiological role in VA and sudden cardiac death.