High-sensitivity cardiac troponin T in patients with intermittent claudication and its relation with cardiovascular events and all-cause mortality--the CAVASIC Study.

Background: Serum concentrations of high-sensitivity cardiac troponin T (hs-cTnT) are elevated in various diseases. The role of this marker in peripheral arterial disease (PAD) has not been fully investigated.

Methods: Hs-cTnT was measured in the CAVASIC Study, a male cohort of 235 patients diagnosed with intermittent claudication and 249 age- and diabetes-matched controls. Patients with symptomatic PAD were prospectively followed for a median time of 7 years. The association of hs-cTnT with PAD, cardiovascular disease (CVD) at baseline as well as incident CVD and all-cause mortality during follow-up was analyzed.

Results: Detectable hs-cTnT was associated with an 84% higher probability for symptomatic PAD at baseline: OR = 1.84, 95%CI 1.05-3.21, p = 0.03. Inclusion of ln-NT-proBNP or prevalent CVD abolished this association (both OR = 1.22, p = 0.52). However, detectable hs-cTnT was associated with prevalent CVD (n = 69) in PAD patients independent from ln-NT-proBNP: OR = 3.42, p = 0.001. In the adjusted Cox regression analysis detectable (HR = 2.15, p = 0.05) and especially hs-cTnT ≥ 14 ng/L (HR = 5.06, p < 0.001) were predictive for all-cause mortality (n = 39) independent from ln-NT-proBNP. Furthermore, hs-cTnT ≥ 14 ng/L was significantly associated with incident CVD (n = 66): HR = 3.15, 95%CI 1.26-7.89, p = 0.01.

Conclusions: This study in male patients with intermittent claudication and age- and diabetes-matched controls revealed hs-cTnT to be associated with PAD and prevalent CVD. The latter association was even significant after considering NT-proBNP. Prospectively, in PAD patients hs-cTnT was predictive for incident cardiovascular diseases and all-cause mortality. Thus, hs-cTnT could be a surrogate marker for cardiomyocyte damage also in symptomatic PAD patients.