Quantification of liver perfusion with [(15)O]H(2)O-PET and its relationship with glucose metabolism and substrate levels.: Quantification of liver perfusion with PET

Abstract : BACKGROUND/AIMS: Hepatic perfusion plays an important role in liver physiology and disease. This study was undertaken to (a) validate the use of Positron Emission Tomography (PET) and oxygen-15-labeled water ([(15)O]H(2)O) to quantify hepatic and portal perfusion, and (b) examine relationships between portal perfusion and liver glucose and lipid metabolism. METHODS: Liver [(15)O]H(2)O-PET images were obtained in 14 pigs during fasting or hyperinsulinemia. Carotid arterial and portal venous blood were sampled for [(15)O]H(2)O activity; Doppler ultrasonography was used invasively as the reference method. A single arterial input compartment model was developed to estimate portal tracer kinetics and liver perfusion. Endogenous glucose production (EGP) and insulin-mediated whole body glucose uptake (wbGU) were determined by standard methods. RESULTS: Hepatic arterial and portal venous perfusions were 0.15+/-0.07 and 1.11+/-0.34 ml/min/ml of tissue, respectively. The agreement between ultrasonography and [(15)O]H(2)O-PET was good for total and portal liver perfusion, and poor for arterial perfusion. Portal perfusion was correlated with EGP (r=or+0.62, p=0.03), triglyceride (r=or+0.66, p=0.01), free fatty acid levels (r=or+0.76, p=0.003), and plasma lactate levels (r=or-0.81, p=0.0009). CONCLUSIONS: Estimates of liver perfusion by [(15)O]H(2)O-PET compared well with those by ultrasonography. The method allowed to predict portal tracer concentrations which is essential in human studies. Portal perfusion may affect liver nutrient handling.
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Journal of Hepatology, Elsevier, 2008, 48 (6), pp.974-82. 〈10.1016/j.jhep.2008.01.029〉
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Lotfi Slimani, Nobuyuki Kudomi, Vesa Oikonen, Mikko Jarvisalo, Jan Kiss, et al.. Quantification of liver perfusion with [(15)O]H(2)O-PET and its relationship with glucose metabolism and substrate levels.: Quantification of liver perfusion with PET. Journal of Hepatology, Elsevier, 2008, 48 (6), pp.974-82. 〈10.1016/j.jhep.2008.01.029〉. 〈inserm-00402779〉

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