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Clinical usefulness of ECG-gated18F-FDG PET combined with99mTc-MIBI gated SPECT for evaluating myocardial viability and function

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Abstract

Objectives

This study sought to evaluate an imaging approach using gated99mTc-MIBI (MIBI) SPECT and gated18F-FDG (FDG) PET for assessment of myocardial viability and cardiac function.

Methods

Forty-eight patients (38 men, mean age 68.1 ± 9.6 years) underwent ECG-gated FDG PET and MIBI SPECT within a week. The baseline diagnoses were coronary artery disease (31), mitral regurgitation (1), paroxysmal arrhythmia (10), and dilated cardiomyopathy (6). The gated FDG PET data were analyzed using pFAST software, and the gated MIBI SPECT data were analyzed using QGS software. Fifteen patients were diagnosed with myocardial infarction, and follow-up study was performed to assess the functional outcome four months later. An improvement in LVEF of >5% was defined as significant. The LV myocardium was divided into 17 segments, and regional defect scores were visually assessed using a 4-point scale for each segment (0 = normal, 1 = mildly reduced, 2 = moderately reduced, 3 = absent). A segment with a greater defect score on MIBI SPECT than on FDG PET was defined as a mismatch. The patients were divided into two groups: those with at least two mismatched segments (MM-group), and those with none or one (M-group).

Results

LVEF, EDV and ESV measured by gated FDG PET were highly correlated with those obtained by gated MIBI SPECT (r = 0.848, 0.855 and 0.911, p < 0.0001, respectively). The mean values of LVEF did not differ significantly, but EDV and ESV obtained by gated FDG PET were significantly grater than those obtained by gated MIBI SPECT (p < 0.0001). In 15 patients diagnosed with myocardial infarction, a significant association (p < 0.05) was found between the relative uptake of FDG PET and MIBI SPECT and the functional outcome 4 months later. Global LV function improved in 6 of the 8 patients showing mismatch but in only 1 of the 7 patients with matched defects, resulting in a sensitivity of 86% and specificity of 75%. The overall accuracy to predict global functional outcome was high (80%).

Conclusion

This imaging approach allows accurate evaluation of myocardial viability. Furthermore, the high correlations of gated FDG PET and gated MIBI SPECT measurements hold promise for the assessment of left ventricular function using gated FDG PET.

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Authors and Affiliations

  1. Second Department of Internal Medicine, Yokohama City University School of Medicine, 3-9 Fukuura, Kanazawa-ku, 236-0004, Yokohama, JAPAN

    Yohei Yamakawa, Toshiyuki Iswkawa, Kazuaki Uchino, Yasuyuki Mochida, Toshiaki Ebina, Tsukasa Kobayashi, Kohei Matsushita, Katsumi Matsumoto, Noriko Kawasaki, Mie Shimura, Yasuo Ohkusu, Shinichi Sumita, Kazuo Kimura & Satoshi Umemura

  2. Department of Radiology, Yokohama City University School of Medicine, Japan

    Nobukazu Takahashi & Tomio Inoue

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  1. Yohei Yamakawa
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  2. Nobukazu Takahashi
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Correspondence to Yohei Yamakawa.

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Yamakawa, Y., Takahashi, N., Iswkawa, T. et al. Clinical usefulness of ECG-gated18F-FDG PET combined with99mTc-MIBI gated SPECT for evaluating myocardial viability and function. Ann Nucl Med 18, 375–383 (2004). https://doi.org/10.1007/BF02984480

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  • DOI: https://doi.org/10.1007/BF02984480

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