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J Card Fail. 2008 Jun;14(5):394-9. doi: 10.1016/j.cardfail.2008.01.006. Epub 2008 May 27.

Impact of myocardial function on cystatin C measurements in chronic systolic heart failure.

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  • 1Kaufman Center for Heart Failure, Department of Cardiovascular Medicine, Cleveland Clinic, Cleveland Ohio 44195, USA.

Abstract

BACKGROUND:

The influence of myocardial function on plasma levels of cystatin C (CysC), a sensitive marker of renal function, in chronic systolic heart failure (HF) has not been well established.

METHODS:

We prospectively identified 139 subjects with stable, chronic HF (left ventricular ejection fraction < or = 35%) and measured plasma levels of CysC. We prospectively tracked patients' long-term adverse clinical outcomes (death, cardiac transplantation, and HF hospitalizations).

RESULTS:

Plasma levels of CysC were elevated in 41% of patients with preserved renal function and directly correlated with N-terminal prohormone brain natriuretic peptide (r = 0.57, P < .0001). There was a significant association between CysC and mitral E/septal E' ratio (r = 0.34, P < .001), right ventricular systolic dysfunction severity (r = 0.30, P < .001), and mitral regurgitation severity (r = 0.31, P < .001), but not left ventricular ejection fraction. At the cutoff of 1.23 mg/dL, CysC remains a significant independent risk factor for adverse clinical outcomes (hazard ratio 1.88, 95% confidence interval 1.15-3.09, P = .012) after adjusting for estimated glomerular filtration rate, left ventricular ejection fraction, and E/septal E'.

CONCLUSION:

CysC is associated with more advanced left ventricular diastolic dysfunction and right ventricular systolic dysfunction and remains an independent predictor of long-term prognosis in chronic systolic HF after adjusting for myocardial factors.

PMID:
18514931
[PubMed - indexed for MEDLINE]
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