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Erschienen in: Journal of Neurology 11/2020

16.06.2020 | Original Communication

Appropriate assessment method of 123I-MIBG myocardial scintigraphy for the diagnosis of Lewy body diseases and idiopathic REM sleep behavior disorder

verfasst von: Kazuto Tsukita, Naoko Tachibana, Toshiaki Hamano

Erschienen in: Journal of Neurology | Ausgabe 11/2020

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Abstract

Background

In 123I-metaiodobenzylguanidine (123I-MIBG) myocardial scintigraphy, the early heart-to-mediastinum (H/M) ratio is considered to reflect the density of the cardiac sympathetic nerve endings, washout rate (WR) is an indicator of the cardiac sympathetic tone, and the delayed H/M ratio reflects both. The Delayed H/M ratio is usually used to support the diagnosis of Lewy body diseases (LBDs) and idiopathic REM sleep behavior disorder (iRBD); however, which values should be used have not been specified. Here, we hypothesized that the combination of these values is appropriate for the diagnostic purpose.

Methods

In this single-center retrospective cohort study, we recruited 106 patients with LBDs or iRBD and 33 patients without those diseases, of whom we reviewed the 123I-MIBG myocardial scintigraphy results.

Results

Sensitivity/specificity to diagnose LBDs and iRBD were 0.77/0.94 for the early H/M ratio (≤ 2.0), 0.82/0.94 for the delayed H/M ratio (≤ 2.0), and 0.89/0.91 for WR (≥ 23.0). When patients were considered positive if at least either the early H/M ratio or WR was abnormal, the sensitivity significantly increased to 0.97, whereas the specificity remained similar at 0.91. Furthermore, our subgroup analyses revealed that WR enhancement preceded H/M ratio reduction, but, in patients with a severely reduced early H/M ratio, paradoxically normal WR could be observed.

Conclusion

We propose the highly sensitive, combined early H/M ratio and WR assessments for 123I-MIBG myocardial scintigraphy. The temporal precedence of cardiac sympathetic dysfunction over denervation and the floor effect in 123I-MIBG uptake may underlie the sensitivity improvement.
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Metadaten
Titel
Appropriate assessment method of 123I-MIBG myocardial scintigraphy for the diagnosis of Lewy body diseases and idiopathic REM sleep behavior disorder
verfasst von
Kazuto Tsukita
Naoko Tachibana
Toshiaki Hamano
Publikationsdatum
16.06.2020
Verlag
Springer Berlin Heidelberg
Erschienen in
Journal of Neurology / Ausgabe 11/2020
Print ISSN: 0340-5354
Elektronische ISSN: 1432-1459
DOI
https://doi.org/10.1007/s00415-020-09992-0

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