Use of iodine-123 metaiodobenzylguanidine scintigraphy for the detection of amiodarone induced pulmonary toxicity in a rabbit model: a comparative study with technetium-99m diethyltriaminepenta acetic acid radioaerosol scintigraphy.
The purpose of the study was; (i) to determine whether 123I-MIBG scintigraphy is sensitive for detection of amiodarone induced pulmonary toxicity (AIPT) and (ii) to compare it with 99mTc-DTPA radioaerosol. Twelve white New Zealand rabbit with initial mean body weight 4.24 +/- 0.47 g were divided into two groups. AIPT group (n = 7) was administered amiodarone (20 mg/kg BW). The control group (n = 5) received the same amount of 0.9% saline. All animals underwent 123I-MIBG and 99mTc-DTPA radioaerosol scintigraphy at the end of the treatment period. 123I-MIBG static thorax images were obtained during 10 minutes at 15 minutes and 3-hours after intravenous injection of the radiopharmaceutical. Lung to heart ratios (LHR) and lung to mediastinum ratios (LMR), and retention index (LRI) of 123I-MIBG were determined. Two days after 123I-MIBG scintigraphy, 99mTc-DTPA radioaerosol scintigraphy was performed, and clearance from the lungs was measured for 10 min (1 min/frame) following termination of inhalation. 123I-MIBG lung retention index (LRI) was significantly higher in the AIPT group than the control (61 +/- 4.6 vs. 40 +/- 4.5, p = 0.01). Early LHR and LMR were significantly lower in the AIPT group than in the control group (p = 0.04, p = 0.01, respectively), whereas those of late LHR and LMR were not significantly different. T1/2 values of DTPA clearance were significantly increased in AIPT group according to the control group (55 +/- 7.2 vs. 86.6 +/- 18.5, p = 0.02). 123I-MIBG scintigraphy is a valuable tool for detecting AIPT in a rabbit model. Additionally, 99mTc-DTPA radioaerosol scintigraphy is an excellent comprehensive investigational tool for detecting AIPT with the added advantage of lower cost.
Durmuş-Altun
Gulay
G
Department of Nuclear Medicine, Faculty of Medicine, Trakya University, Edirne, Turkey. gdurmusaltun@trakya.edu.tr
Altun
Armagan
A
Aktas
Ranan Gülhan
RG
Salihoglu
Yavuz Sami
YS
Yigitbasi
Necmi Omer
NO
D019797:3-Iodobenzylguanidine; D000336:Aerosols; D000638:Amiodarone / Q000009:adverse effects* / Q000627:therapeutic use; D000818:Animals; D000889:Anti-Arrhythmia Agents / Q000009:adverse effects / Q000627:therapeutic use; D007275:Injections, Intravenous; D008168:Lung / Q000000981:diagnostic imaging* / Q000187:drug effects* / Q000473:pathology; D008171:Lung Diseases / Q000139:chemically induced* / Q000000981:diagnostic imaging* / Q000473:pathology; D011817:Rabbits; D011877:Radionuclide Imaging; D019275:Radiopharmaceuticals; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D016284:Technetium Tc 99m Pentetate
D000336:Aerosols; D000889:Anti-Arrhythmia Agents; D019275:Radiopharmaceuticals; D019797:3-Iodobenzylguanidine; D000638:Amiodarone; D016284:Technetium Tc 99m Pentetate