Hepatic and splenic 18 F‐FDG blood clearance rates (Ki) in hepatic steatosis and diabetes mellitus

Autor: Luisa Roldao Pereira, Guven Kaya, Georgia Keramida, A. Michael Peters
Rok vydání: 2019
Předmět:
Zdroj: Clinical Physiology and Functional Imaging. 40:99-105
ISSN: 1475-097X
1475-0961
DOI: 10.1111/cpf.12610
Popis: AIM The study aim was to investigate the relationships of blood glucose level (BGL) with hepatic and splenic blood FDG clearances (Ki) in patients with diabetes mellitus (DM) and/or hepatic steatosis (HS). METHODS This was a retrospective study of 238 patients, including 92 with type 2 DM (DM2) and 11 with type 1 DM (DM1), having routine whole body FDG PET/CT. Patients with lymphoma were excluded. Patients were divided into the following groups: HS-DM-, HS-DM2+, HS+DM-, HS+DM2+ and 2 DM1 groups (hypoglycaemic and hyperglycaemic). ROI were placed over liver and spleen for measurement of SUVmax , and left ventricular cavity (LV) for measurement of SUVmean . Tissue SUVmax was divided by LV SUVmean . This division, giving Z, eliminates bias from the whole body metric used to calculate SUV and renders SUVmax a closer surrogate of Ki. HS was diagnosed when hepatic unenhanced CT was ≤40 HU. RESULTS In all patients, individual hepatic Z and individual splenic Z correlated significantly with individual BGL. Highest mean hepatic Z and highest mean BGL were recorded in HS+ DM2+ group and lowest in hypoglycaemic DM1 group. Patients with DM1 and hyperglycaemia showed low hepatic Z in relation to BGL. Hepatic and splenic Z correlated inversely with CT density in patients without DM but not in those with DM2. CONCLUSION As BGL increases, hepatocyte glucokinase is up-regulated. This includes patients with HS and DM2 but not DM1. We speculate that in HS and DM2, up-regulation results from insulin resistance and hyperinsulinaemia. The data also support a hepato-splenic metabolic axis.
Databáze: OpenAIRE
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