Relationship of cardiac troponin to systolic global longitudinal strain in hypertrophic cardiomyopathy
Agarwal A, Yousefzai R, Shetabi K, et al. Relationship of cardiac troponin to systolic global longitudinal strain in hypertrophic cardiomyopathy. Echocardiography. 2017;34(10):1470-1477. doi: 10.1111/echo.13645.
BACKGROUND: A high proportion of stable hypertrophic cardiomyopathy (HCM) patients have elevated serum cardiac troponin I (cTnI), but its clinical and echocardiographic determinants are unknown. Our objective was to determine the prevalence and clinical predictors of positive troponin (cTnI+) in a well-defined population of HCM patients using a highly sensitive assay.
METHODS: We retrospectively interrogated medical records of 167 stable HCM patients from 1/2011 to 3/2014. cTnI >0.04 ng/mL was considered positive.
RESULTS: Thirty-four percent were troponin-positive (median cTnI was 0.1 [0.07, 0.2] ng/dL). cTnI as a continuous variable correlated positively with maximal left ventricular wall thickness (LVT), maximal interventricular septal thickness, and global longitudinal strain (GLS) (P
CONCLUSION: In this cohort of HCM patients, the association of reduced GLS and positive troponin was independent of LVT. Further studies are warranted to evaluate whether their combination adds prognostic value in identifying high-risk patients to define effective and early intervention strategies.