Iodine-123-metaiodobenzylguanidine imaging can predict future cardiac events in heart failure patients with preserved ejection fraction
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Abstract
Objective
Iodine-123-metaiodobenzylguanidine (123I-MIBG) has been used to assess the function of the cardiac sympathetic nervous system in patients with chronic heart failure (HF). The usefulness of 123I-MIBG imaging for evaluating patients with heart failure with preserved ejection fraction (HFPEF) has not been established.
Methods
We performed 123I-MIBG scintigraphy and echocardiography and measured the plasma brain natriuretic peptide (BNP) levels of 117 consecutive HF patients (64 men, mean age 66 ± 14 years) with a left ventricular ejection fraction (LVEF) of ≥50% who were admitted to our hospital. Patients were divided into 2 groups according to the New York Heart Association (NYHA) functional class.
Results
The 123I-MIBG delayed heart-to-mediastinum (H/M) ratio was significantly lower, and the washout rate (WR) was higher in patients with HFPEF with advanced NYHA functional class (NYHA functional class I and II vs. III: 1.90 ± 0.34 vs. 1.49 ± 0.32, p < 0.0001; 25.9 ± 13.4 vs. 46.9 ± 16.3%, p < 0.0001, respectively). On the other hand, the 123I-MIBG WR was not correlated with LVEF and had a weak correlation with plasma BNP levels (R = 0.207, p = 0.0346). Moreover, patients with a high 123I-MIBG WR showed a poor clinical outcome (p = 0.0033).
Conclusions
123I-MIBG imaging provides independent prognostic information in patients with HFPEF.
Keywords
Cardiac imaging Sympathetic nervous system Washout rate Preserved ejection fractionNotes
Acknowledgments
This study was supported, in part, by a grant-in-aid for Scientific Research (No. 19790513, 21590923, 21790700, and 21790701) from the Ministry of Education Culture, Sport, Science, and Technology and a grant-in-aid from the global century center of excellence (COE) program of the Japan Society for the Promotion of Science. We would like to thank Mr. Akio Okada for his technical supports.
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