Ryuji Sakakibara1, Fuyuki Tateno2, Masahiko Kishi2, Yohei Tsuyusaki2, Hitoshi Terada3, Tsutomu Inaoka3. 1. Neurology, Internal Medicine, Sakura Medical Center, Toho University, 564-1 Shimoshizu, Sakura 285-8741, Japan. Electronic address: sakakibara@sakura.med.toho-u.ac.jp. 2. Neurology, Internal Medicine, Sakura Medical Center, Toho University, 564-1 Shimoshizu, Sakura 285-8741, Japan. 3. Radiology, Internal Medicine, Sakura Medical Center, Toho University, Sakura, Japan.
Abstract
OBJECTIVES: Detecting very early markers of neurodegeneration that predate the diagnosis of idiopathic Parkinson's disease (PD) is a crucial research topic for the development of disease-modifying therapeutic interventions. Recently (123)I-metaiodobenzylguanidine (MIBG) myocardial scintigraphy has become widely used for this purpose, since this test shows high sensitivity and specificity in the diagnosis of PD, based on evidence that cardiac sympathetic nerve fibers are affected early and commonly in PD. We reviewed the literature to determine the role of MIBG myocardial scintigraphy for diagnosing pre-motor PD. METHODS: We performed a systematic review of the literature to identify the use of MIBG myocardial scintigraphy in relation to the constellation of pre-motor symptoms in PD. RESULTS: Mild memory disorder, autonomic failure (constipation and postural hypotension), depression/anxiety, visual hallucination/psychosis (in the elderly), sleep disorder (REM sleep behavior disorder), and impaired olfaction are reported to appear as sole initial symptoms of PD. All clinical features except for impaired olfaction are accompanied by low MIBG uptake, suggestive of very early PD in situ. CONCLUSION: Identifying persons with mild memory disorder, constipation/postural hypotension, depression/anxiety, visual hallucination/psychosis (in the elderly), and REM sleep behavior disorder associated with low MIBG uptake may provide a unique opportunity to detect very early PD in situ within a pre-clinical window. Future prospective studies to investigate further the findings of these early cases are warranted.
OBJECTIVES: Detecting very early markers of neurodegeneration that predate the diagnosis of idiopathic Parkinson's disease (PD) is a crucial research topic for the development of disease-modifying therapeutic interventions. Recently (123)I-metaiodobenzylguanidine (MIBG) myocardial scintigraphy has become widely used for this purpose, since this test shows high sensitivity and specificity in the diagnosis of PD, based on evidence that cardiac sympathetic nerve fibers are affected early and commonly in PD. We reviewed the literature to determine the role of MIBG myocardial scintigraphy for diagnosing pre-motor PD. METHODS: We performed a systematic review of the literature to identify the use of MIBG myocardial scintigraphy in relation to the constellation of pre-motor symptoms in PD. RESULTS:Mild memory disorder, autonomic failure (constipation and postural hypotension), depression/anxiety, visual hallucination/psychosis (in the elderly), sleep disorder (REM sleep behavior disorder), and impaired olfaction are reported to appear as sole initial symptoms of PD. All clinical features except for impaired olfaction are accompanied by low MIBG uptake, suggestive of very early PD in situ. CONCLUSION: Identifying persons with mild memory disorder, constipation/postural hypotension, depression/anxiety, visual hallucination/psychosis (in the elderly), and REM sleep behavior disorder associated with low MIBG uptake may provide a unique opportunity to detect very early PD in situ within a pre-clinical window. Future prospective studies to investigate further the findings of these early cases are warranted.
Authors: Ka Kit Wong; David M Raffel; Nicolaas I Bohnen; Gulcin Altinok; Sid Gilman; Kirk A Frey Journal: J Nucl Med Date: 2016-08-18 Impact factor: 10.057