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.
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.
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.
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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Availability of data and material
Raw data used in this analysis was deposited in OSF (Open Science Framework). View-only link to our data is https://osf.io/6fmhw/?view_only=fadff8b1a6544c398d7ce2e114f0e8a7.
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We thank Dr. Takahiro Kamada for inspiring us to do this study. He died in January 2019, and we wish to dedicate this article to his memory. We also thank Drs. Hiroshi Chatani, Koji Tsuzaki, Naoko Uehara, Yuwa Oka, and Akihiro Kikuya for their support in conducting this study, and Editage (https://www.editage.com) for editing and reviewing this manuscript for English language.
This study was neither supported nor funded.
Conflicts of interest
On behalf of all authors, the corresponding author states that there is no conflict of interest concerning this study. Outside this study, Naoko Tachibana received a research grant from Novartis Pharma K.K.
This study was approved by the institutional review board of Kansai Electric Power Hospital and conducted according to the ethical standards issued by the Declaration of Helsinki.
Consent to participate and consent for publication
The details of this study was posted up in our hospital with our contact information. All patients were exempt by the institutional review board of Kansai Electric Power Hospital from providing written informed consent due to the retrospective design of this study; however, all patients had the chance to request the detailed explanation from us and opt out at any time.
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Tsukita, K., Tachibana, N. & Hamano, T. Appropriate assessment method of 123I-MIBG myocardial scintigraphy for the diagnosis of Lewy body diseases and idiopathic REM sleep behavior disorder. J Neurol (2020). https://doi.org/10.1007/s00415-020-09992-0
- 123I-MIBG myocardial scintigraphy
- Lewy body diseases
- Idiopathic REM sleep behavior disorder