title: Decreased myocardial accumulation of 123I-meta-iodobenzyl guanidine in Parkinson's disease.
abstract: The aim of this study was to evaluate 123I-meta-iodobenzyl guanidine (123I-MIBG) myocardial scintigraphy in patients with Parkinson's disease as a way of detecting cardiac sympathetic dysfunction, and comparing the stage of disease and intensity of drug treatment with accumulation of 123I-MIBG. 123I-MIBG myocardial scintigraphy was performed in 48 patients with Parkinson's disease and 25 control subjects. In the planar imaging studies, the data acquisition matrix was 256 x 256 and the preset time was 5 min. The heart-to-mediastinum (H/M) average count ratio was calculated for both early (15 min) and delayed (3-4 h) images after 123I-MIBG injection (111 MBq). The mean H/M ratio in patients with Parkinson's disease was significantly lower than that in the controls (P < 0.0001). Regardless of disease severity, intensity of anti-Parkinson treatment and the presence or absence of orthostatic hypotension, the mean H/M ratios were always low in the Parkinsonian patients. Parkinson's disease may result in a severe abnormality of cardiac sympathetic function which has not been detected by previous cardiovascular autonomic studies.
authors.affiliation: Department of Neurology, Tokyo Metropolitan Neurological Hospital, Fuchu, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Yoshita
authors.forename: M
authors.initials: M
authors.lastname: Hayashi
authors.forename: S
authors.initials: S
authors.lastname: Hirai
mesh_terms: D019797:3-Iodobenzylguanidine / Q000493:pharmacokinetics; D000368:Aged; D000369:Aged, 80 and over; D000978:Antiparkinson Agents / Q000627:therapeutic use; D005260:Female; D006321:Heart / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009206:Myocardium / Q000378:metabolism*; D010300:Parkinson Disease / Q000000981:diagnostic imaging* / Q000188:drug therapy / Q000378:metabolism; D011877:Radionuclide Imaging; D019275:Radiopharmaceuticals / Q000493:pharmacokinetics; D012016:Reference Values; D014018:Tissue Distribution
chemical_list: D000978:Antiparkinson Agents; D019275:Radiopharmaceuticals; D019797:3-Iodobenzylguanidine