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The utility of washout rate in the Lewy body diseases with normal early 123I-MIBG H/M ratios 1Department of Diagnostic Radiology, Kumamoto University Hospital Keyword: レビー小体病 , MIBG , washout rate pp.1249-1255
Published Date 2019/9/10
DOI https://doi.org/10.18888/rp.0000001008
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Objective:The aim of this study was to elucidate whether the washout rate(WR)are useful for diagnosing LBD, especially for the LBD patients with normal early 123I-MIBG H/M ratios.

Materials and Methods:We included 479 patients with clinically suspected LBD who had undergone 123I-MIBG early(15 min)and delayed(3 h)myocardial imaging studies. The final diagnosis consisted of LBD in 222 patients(111 males, 111 females;mean age±SD, 72.1±10.4 years;range, 40- 89 years)and non-LBD in 257 patients(110 males, 147 females;mean age±SD, 70.8±10.1 years;range, 35- 92 years). First, we examined the usefulness of early and delayed H/M ratios and WR in the diagnosis of LBD in whole cases. Second, we evaluated whether WR can be useful in the group without decrease of H/M ratio(normal 123I-MIBG myocardial uptake group).

Results:In whole analysis, the LBD patients showed significantly lower early H/M ratios(1.9±0.5 vs. 2.9±0.59, p<0.0001), lower delayed H/M ratios(1.6±0.7 vs. 3.0±0.7, p<0.0001)and higher WR(46.0±17.3 vs. 24.8±19.0, p<0.0001)than the non-LBD patients. When we defined the early H/M ratio≥2.1 as normal 123I-MIBG myocardial uptake group, 291 patients showed normal early myocardial uptake(52 LBD patients;27 males and 25 females;mean age±SD, 68.7±13.9 years;range, 40- 89 years and 239 non-LBD patients;101 males and 138 females;mean age±SD, 70.7±10.2 years;range, 35- 92 years). In the normal 123I-MIBG myocardial uptake group, the WR showed significantly higher in LBD patients than in non-LBD patients(33.7±18.7% vs. 20.4±17.1%, p=0.012).

Conclusion:All 3 indices(early and delayed H/M ratios and WR)were useful for diagnosing LBD. Even in cases of early normal H/M ratios, acceleration of WR may be observed in LBD patients and WR may be a useful index for diagnosing LBD in such cases.


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電子版ISSN 印刷版ISSN 0009-9252 金原出版

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