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    Use of a highly-sensitive cardiac troponin I assay in a screening population for hypertrophic cardiomyopathy: a case-referent study

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    Authors
    McGorrian, Catherine M
    Lyster, Sarah
    Roy, Andrew
    Tarrant, Heloise
    Codd, Mary
    Doran, Peter
    Fitzgibbon, Maria
    Galvin, Joseph
    Mahon, Niall G
    Issue Date
    2013-09-11
    Keywords
    SCREENING
    Local subject classification
    HEART DISEASE
    
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    Citation
    BMC cardiovascular disorders. 2013 Sep 11;13(1):70
    Journal
    BMC cardiovascular disorders. 2013 Sep 11;13(1):70
    URI
    http://dx.doi.org/10.1186/1471-2261-13-70
    http://hdl.handle.net/10147/315469
    Abstract
    Abstract Background Hypertrophic cardiomyopathy (HCM) is a genetic condition, and relatives of affected persons may be at risk. Cardiac troponin biomarkers have previously been shown to be elevated in HCM. This study examines the new highly-sensitive cardiac troponin I (hsTnI) assay in a HCM screening population. Methods Nested case–control study of consecutive HCM sufferers and their relatives recruited from May 2010 to September 2011. After informed consent, participants provided venous blood samples and clinical and echocardiographic features were recorded. Associations between the natural log (ln) of the contemporary troponin I (cTnI) and hsTnI assays and markers of cardiac hypertrophy were examined. Multiple regression models were fitted to examine the predictive ability of hsTnI for borderline or definite HCM. Results Of 107 patients, 24 had borderline and 19 had definite changes of HCM. Both TnI assays showed significant, positive correlations with measures of cardiac muscle mass. After age and sex adjustment, the area under the receiver operator characteristic (AUROC) curve for the outcome of HCM was 0.78, 95% CI [0.65, 0.90], for ln(hsTnI), and 0.66, 95% CI [0.51, 0.82], for ln(cTnI) (p=0.11). Including the hsTnI assay in a multiple-adjusted “screening” model for HCM resulted in a non-significant improvement in both the AUROC and integrated discrimination index. Conclusions Both cTnI and hsTnI show a graded, positive association with measures of cardiac muscle mass in persons at risk of HCM. Further studies will be required to evaluate the utility of these assays in ECG- and symptom-based identification of HCM in at-risk families.
    Item Type
    Article
    Language
    en
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