Feasibility of myocardial PET imaging using a benzylguanidine analog: meta-(3-[18F]fluoropropyl)benzylguanidine ([18F]mFPBG).
Nucl Med Biol
; 61: 63-70, 2018 06.
Article
em En
| MEDLINE
| ID: mdl-29783202
ABSTRACT
INTRODUCTION:
Global and regional sympathetic activity in the heart can be evaluated using [123I]meta-iodobenzylguanidine ([123I]mIBG) imaging. However, [123I]mIBG is associated with low image spatial resolution and sensitivity in cardiac imaging. We investigated the capability of an F-18-labeled mIBG derivative, meta-(3-[18F]fluoropropyl)benzylguanidine ([18F]mFPBG), for identifying ischemic and viable myocardium in a rat model of myocardial infarction. MATERIALS ANDMETHODS:
The ex vivo biodistribution and in vivo metabolic stability of [18F]mFPBG were investigated in Sprague-Dawley rats. Selective cardiac adrenergic activation was confirmed via a blocking experiment involving pretreatment with desipramine (2â¯mgâ¯kg-1), followed by the administration of [18F]mFPBG. Imaging properties of [18F]mFPBG were compared with those of traditional cardiac imaging radiotracers ([123I]mIBG and [99mTc]MIBI) in a rat model of myocardial infarction. Non-invasive image-based measurements of infarct sizes were then compared with histological findings by using Bland-Altman analysis.RESULTS:
The differences in infarct sizes determined using histological analysis and [18F]mFPBG PET were -2.55⯱â¯4.99% (range -12.33 to 7.22), -2.35⯱â¯3.32% (range -8.87 to 4.16), and -3.15⯱â¯6.16% (range -15.24 to 8.93) at 5, 20, and 40â¯min, respectively. Furthermore, [18F]mFPBG PET was superior to traditional imaging methods in assessing the degree of ischemia in areas of myocardial infarction, as well as the actual infarct size.CONCLUSION:
Compared to [123I]mIBG, [18F]mFPBG showed improved spatial resolution and sensitivity in a rat model of myocardial infarction. This result suggested that [18F]mFPBG is a promising cardiac PET imaging agent for potential diagnostic application in PET cardiology.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Radioisótopos de Flúor
/
Tomografia por Emissão de Pósitrons
/
Guanidinas
/
Coração
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
Nucl Med Biol
Assunto da revista:
BIOLOGIA
/
MEDICINA NUCLEAR
Ano de publicação:
2018
Tipo de documento:
Article