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Published in: EJNMMI Research 1/2021

01-12-2021 | Parkinson's Disease | Original research

Dynamic planar scintigraphy for the rapid kinetic measurement of myocardial 123I-MIBG turnover can identify Lewy body disease

Authors: Yoshitaka Kumakura, Yuji Shimizu, Masatsugu Hariu, Ken-ichi Ichikawa, Norihito Yoshida, Masato Suzuki, Satoru Oji, Shinya Narukawa, Haruo Yoshimasu, Kyoichi Nomura

Published in: EJNMMI Research | Issue 1/2021

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Abstract

Background

Using two static scans for 123I-meta-iodobenzyl-guanidine (123I-MIBG) myocardial scintigraphy ignores the dynamic response from vesicular trapping in nerve terminals. Moreover, the long pause between scans is impractical for patients with Lewy body diseases (LBDs). Here, we optimized indices that capture norepinephrine kinetics, tested their diagnostic performance, and determined the differences in 123I-MIBG performance among disease groups.

Methods

We developed a new 30-min protocol for 123I-MIBG dynamic planar imaging for suspected LBD patients. Pharmacokinetic modelling of time-activity curves (TACs) was used to calculate three new indices: unidirectional uptake of 123I-MIBG to vesicular trapping (iUp), rate of myocardial 123I-MIBG loss (iLoss), and non-specific fractional distribution of 123I-MIBG in the interstitial space. We compared the performance of the new and existing indices with regard to discrimination of patients with or without LBDs. Subgroup analysis was performed to examine differences in 123I-MIBG turnover between patients in a dementia with Lewy bodies (DLB) group and two Parkinson’s disease (PD) groups, one with and the other without REM sleep behaviour disorder (RBD).

Results

iLoss was highly discriminative, particularly for patients with low myocardial 123I-MIBG trapping, and the new indices outperformed existing ones. ROC analysis revealed that the AUC of iLoss (0.903) was significantly higher than that of early HMR (0.863), while comparable to that of delayed HMR (0.892). The RBD-positive PD group and the DLB group had higher turnover rates than the RBD-negative PD group, indicating a potential association between prognosis and iLoss.

Conclusion

123I-MIBG turnover can be quantified in 30 min using a three-parameter model based on 123I-MIBG TACs. The discriminatory performance of the new model-based indices might help explain the neurotoxicity or neurodegeneration that occurs in LBD patients.
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Metadata
Title
Dynamic planar scintigraphy for the rapid kinetic measurement of myocardial 123I-MIBG turnover can identify Lewy body disease
Authors
Yoshitaka Kumakura
Yuji Shimizu
Masatsugu Hariu
Ken-ichi Ichikawa
Norihito Yoshida
Masato Suzuki
Satoru Oji
Shinya Narukawa
Haruo Yoshimasu
Kyoichi Nomura
Publication date
01-12-2021
Publisher
Springer Berlin Heidelberg
Published in
EJNMMI Research / Issue 1/2021
Electronic ISSN: 2191-219X
DOI
https://doi.org/10.1186/s13550-021-00864-w

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