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- Open Access
Prognostic significance of coronary flow reserve assessed by MR flow measurement in the coronary sinus in patients with hypertrophic cardiomyopathy
© Shiraishi et al; licensee BioMed Central Ltd. 2013
- Published: 30 January 2013
- Coronary Sinus
- Hypertrophic Cardiomyopathy
- Unfavorable Outcome
- Coronary Flow Reserve
- Major Cardiac Event
Previous studies using positron emission tomography demonstrated that decrease in global coronary flow reserve (CFR) predisposes to major cardiac events in patients with coronary artery disease. However, the value of MR assessment of CFR has not been clarified for predicting future cardiac events in hypertrophic cardiomyopathy (HCM). The purpose of this study was to evaluate a prognostic significance of CFR measurement in the coronary sinus in patients with HCM.
Fifty-three patients with HCM underwent MR flow measurements in the coronary sinus during adenosine stress and in the resting state, cine MRI and late gadolinium enhanced (LGE) MRI between 2005 and 2008. CFR was calculated as the ratio of hyperemic blood flow divided by resting blood flow. After exclusion of 13 patients who had impaired LV systolic function on cine MRI (LVEF<50%, n=11) or congestive heart failure (NYHA class III-IV, n=2), 40 patients with a mean age of 62.6±10.7 years were followed for a mean duration of 4.8±1.9 years. Unfavorable outcomes were defined as cardiovascular death, unplanned cardiovascular hospital stay, and sustained ventricular arrhythmias requiring the implantation of cardioverter-defibrillator.
Reduced CFR assessed by MR flow measurement in the coronary sinus is a strong, independent predictor of unfavorable cardiac outcomes in HCM patients with preserved LV systolic function.
Departmental research funding.
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.