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Current Drug Metabolism


ISSN (Print): 1389-2002
ISSN (Online): 1875-5453

Review Article

Various Aspects of Fasting on the Biodistribution of Radiopharmaceuticals

Author(s): Sajjad Ahmadpour*, Mohammad Amin Habibi and Seyed Jalal Hosseinimehr*

Volume 23, Issue 10, 2022

Published on: 12 October, 2022

Page: [827 - 841] Pages: 15

DOI: 10.2174/1389200223666220919121354

Price: $65


It is demonstrated that fasting can alter the biodistribution of radiopharmaceuticals in nuclear medicine. Various studies have highlighted that fasting is interpreted to be easy for physicians during PET study, fasting is one of the most important factors determining the usefulness of this protocol. It is well documented that fasting can suppress normal 18F-FDG PET uptake during nuclear cardiology. However, there is no consensus about the usefulness of fasting on radiopharmaceuticals, especially on 18F-FDG in PET imaging, but special attention should be paid to the setting of the fasting duration. Nevertheless, it does seem we still need extensive clinical studies in the future. The present study aims to review the various aspects of fasting, especially metabolic alteration on radiopharmaceutical biodistribution. In this study, we focused more on the effect of fasting on 18F-FDG biodistribution, which alters its imaging contrast in cardiology and cancer imaging. Therefore, shifting substrate metabolism from glucose to free fatty acids during fasting can be an alternative approach to suppress physiological myocardial uptake.

Keywords: Fasting, nuclear medicine, cardiology, oncology, 18F-FDG, radiopharmaceuticals metabolism, biodistribution.

Graphical Abstract
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