Serial change of iodine-123 metaiodobenzylguanidine (MIBG) myocardial concentration in patients with dilated cardiomyopathy.
Serial change of the metaiodobenzylguanidine iodine-123 (123I-MIBG) myocardial concentration was investigated in patients with dilated cardiomyopathy (DCM). Eight DCM patients and 6 control subjects were examined. After the injection of thallium-201 and 123I-MIBG, planar chest images were obtained simultaneously for both tracers in every 30-60 min over 5 h. Serial changes of myocardial uptake ratio (MUR) were compared for both tracers. In DCM, the initial MUR of 123I-MIBG did not differ significantly from that of the controls. The washout of 123I-MIBG from the myocardium, however, was significantly increased in DCM. In particular, the decrease in the early phase (15-45 min) was significantly larger in DCM than in the controls (21.2% +/- 7.5% vs. 5.3% +/- 4.0%, P less than 0.01), showing a significant negative correlation with the left ventricular ejection fraction (r = -0.72 P less than 0.05). For 201Tl, neither the initial MUR nor the washout rate different significantly between the two. Thus, an early rapid decrease of the 123I-MIBG myocardial concentration might characterize DCM and reflect the severity of this disease.
Yamakado
K
K
Department of Radiology, Mie University School of Medicine, Japan.
Takeda
K
K
Kitano
T
T
Nakagawa
T
T
Futagami
Y
Y
Konishi
T
T
Hamada
M
M
Nakano
T
T
Ichihara
T
T
D019797:3-Iodobenzylguanidine; D000328:Adult; D000368:Aged; D002311:Cardiomyopathy, Dilated / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007457:Iodine Radioisotopes; D007462:Iodobenzenes / Q000493:pharmacokinetics*; D008297:Male; D008875:Middle Aged; D009206:Myocardium / Q000378:metabolism*; D011877:Radionuclide Imaging; D013794:Thallium Radioisotopes / Q000493:pharmacokinetics
D007457:Iodine Radioisotopes; D007462:Iodobenzenes; D013794:Thallium Radioisotopes; D019797:3-Iodobenzylguanidine