title: [Iodine-123-labeled meta-iodobenzylguanidine myocardial scintigraphy evaluation of Machado-Joseph disease].
abstract: Iodine-123-labeled meta-iodobenzylguanidine ([123I]MIBG), an analogue of guanetidine, is used as a tracer for evaluation of the function of sympathetic neurons. To investigate cardiac sympathetic function in Machado-Joseph disease (MJD), [123I] MIBG myocardial scintigraphy was performed in 12 patients with MJD and 20 controls. In planar imaging studies, the heart to the mediastinum of the average count ratio (H/M) was calculated for both early and delayed images. The mean values of H/M in delayed images of MJD was lower than those of controls (p < 0.01), but this did not correlate with duration of the illness. The mean values of H/M in MJD patients with abnormal sympathetic skin response (SSR) was lower than that with normal SSR (p < 0.05). The decrease of H/M in delayed image is more sensitive than abnormal SSR. The increase of heart rate after standing in the patients with low H/M was lower than those with normal H/M. Abnormal cardiac sympathetic function revealed by [123I]MIBG myocardial scintigraphy in MJD can be seen earlier than abnormal sudomotor system detected by SSR.
authors.affiliation: Department of Neurology, Tokyo Metropolitan Neurological Hospital.
authors.forename: T
authors.initials: T
authors.lastname: Kazuta
authors.forename: M
authors.initials: M
authors.lastname: Hayashi
authors.forename: M
authors.initials: M
authors.lastname: Yoshita
authors.forename: S
authors.initials: S
authors.lastname: Hirai
mesh_terms: D019797:3-Iodobenzylguanidine; D000328:Adult; D000368:Aged; D006321:Heart / Q000000981:diagnostic imaging; D006801:Humans; D007457:Iodine Radioisotopes; D017827:Machado-Joseph Disease / Q000000981:diagnostic imaging*; D008875:Middle Aged; D011877:Radionuclide Imaging
chemical_list: D007457:Iodine Radioisotopes; D019797:3-Iodobenzylguanidine