Noninvasive identification of left ventricular involvements in arrhythmogenic right ventricular dysplasia: Comparison of123I-MIBG,201TlCl, magnetic resonance imaging and ultrafast computed tomography
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We examined the feasibility of myocardial123I-MIBG,201TlCl, magnetic resonance imaging (MRI) and ultrafast computed tomography (UFCT) for the early detection of left ventricular involvements in 15 patients with arrhythmogenic right ventricular dysplasia (ARVD). Radionuclide ventriculography (RNV) and myocardial imaging with123I-MIBG,201TlCl, MRI and UFCT were performed in all 15 patients and in 10 normal subjects.
The patients’ scans were visually interpreted by two nuclear medicine physicians taking into consideration the extent score (ES) and severity score (SS) calculated by using the bull’s-eye view in relation to normal data derived from the normal subjects. The left ventricular ejection fraction (LVEF) was measured by RNV. Fourteen (93%) patients showed regional123I-MIBG defects, while 12 (80%) patients showed regional201TlCl defects. The ES and SS were higher in123I-MIBG than201TlCl (ES: 31.5± 18.5 vs. 17.5+18.2, p < 0.01, SS: 34.8±42.2 vs. 16.9±37.5, p< 0.01). Abnormal UFCT and MRI findings suggesting fatty involvements of the LV myocardium were demonstrated in 7 patients (Group B), while 7 patients showed regional123I-MIBG defects without abnormal UFCT and MRI findings (Group A).123I-MIBG was significantly more sensitive than UFCT and MRI (p< 0.05), although one patient, an exception, showed abnormal UFCT findings for the apex of the LV myocardium without abnormal123I-MIBG and MRI findings. The LVEF, as a measure of LV systolic function, was better preserved in Group A than in Group B (59.3±3.6 vs. 45.8±5.8, p< 0.01).
The present findings indicated that myocardial imaging with123I-MIBG sensitively detects myocardial damage in patients with ARVD in the early stage when cardiac systolic function is still preserved.
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- Noninvasive identification of left ventricular involvements in arrhythmogenic right ventricular dysplasia: Comparison of123I-MIBG,201TlCl, magnetic resonance imaging and ultrafast computed tomography
Annals of Nuclear Medicine
Volume 11, Issue 3 , pp 233-241
- Cover Date
- Print ISSN
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- arrhythmogenic right ventricular dysplasia
- magnetic resonance imaging
- ultrafast computed tomography imaging
- Industry Sectors
- Author Affiliations
- 1. Department of Radiology, National Cardiovascular Center, 5-7-1 Fujishirodai, Suita, 565, Osaka, Japan
- 2. Department of Cardiology, National Cardiovascular Center, Japan
- 3. Department of Cardiovascular Medicine, Okayama University Medical School, Japan