Ryogo Minamimoto1, Toru Awaya2, Kentaro Iwama2, Masatoshi Hotta3, Kazuhiko Nakajima3, Risen Hirai4, Osamu Okazaki2, Yukio Hiroi2. 1. Division of Nuclear Medicine, Department of Radiology, National Center for Global Health and Medicine, 1-21-1, Toyama, Shinjyuku-ku, Tokyo, 162-8655, Japan. ryogominamimoto@yahoo.co.jp. 2. Department of Cardiovascular Medicine, National Center for Global Health and Medicine, Tokyo, Japan. 3. Division of Nuclear Medicine, Department of Radiology, National Center for Global Health and Medicine, 1-21-1, Toyama, Shinjyuku-ku, Tokyo, 162-8655, Japan. 4. Division of Hematology, Internal medicine, Tokyo Kita Medical Center, Tokyo, Japan.
Abstract
BACKGROUND: This study was to investigate the significance of 11C-Pittsburgh B (PIB) PET/CT in patients with suspected cardiac amyloidosis compared with 99mTc-aprotinin scintigraphy. METHODS: Thirteen consecutive patients with suspected cardiac amyloidosis were considered for enrolment in this prospective pilot study. Participants were scheduled to undergo a series of 11C-PIB PET/CT and 99mTc-aprotinin within a 2-month period. Finally, we evaluated nine cases who underwent both imaging modalities, and compared imaging results with clinical and pathological results and prognosis. RESULTS: Six of the 9 patients who underwent both imaging modalities were diagnosed with amyloidosis, of whom 3 patients were diagnosed with cardiac amyloidosis from endomyocardial biopsy. These 3 patients with positive 11C-PIB uptake at the left ventricle wall showed worsening of cardiac function progressing in the short term or death caused by acute exacerbation of chronic heart failure. Six of 8 patients with positive uptake on 99mTc-aprotinin presented with amyloid deposition in the left ventricle wall, but symptoms remained stable if results of 11C-PIB were not positive. CONCLUSION: In a small sample of subjects, the present study showed that 11C-PIB accumulation in myocardium indicated cardiac amyloidosis with poor prognosis. Uptake of 11C-PIB may be related to progressive amyloid deposition to the heart and can predict patient prognosis.
BACKGROUND: This study was to investigate the significance of 11C-Pittsburgh B (PIB) PET/CT in patients with suspected cardiac amyloidosis compared with 99mTc-aprotinin scintigraphy. METHODS: Thirteen consecutive patients with suspected cardiac amyloidosis were considered for enrolment in this prospective pilot study. Participants were scheduled to undergo a series of 11C-PIB PET/CT and 99mTc-aprotinin within a 2-month period. Finally, we evaluated nine cases who underwent both imaging modalities, and compared imaging results with clinical and pathological results and prognosis. RESULTS: Six of the 9 patients who underwent both imaging modalities were diagnosed with amyloidosis, of whom 3 patients were diagnosed with cardiac amyloidosis from endomyocardial biopsy. These 3 patients with positive 11C-PIB uptake at the left ventricle wall showed worsening of cardiac function progressing in the short term or death caused by acute exacerbation of chronic heart failure. Six of 8 patients with positive uptake on 99mTc-aprotinin presented with amyloid deposition in the left ventricle wall, but symptoms remained stable if results of 11C-PIB were not positive. CONCLUSION: In a small sample of subjects, the present study showed that 11C-PIB accumulation in myocardium indicated cardiac amyloidosis with poor prognosis. Uptake of 11C-PIB may be related to progressive amyloid deposition to the heart and can predict patient prognosis.
Entities:
Keywords:
Amyloidosis; Aprotinin; Pittsburgh compound B
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