Abstract
The function of the human myocardium depends upon a continuous supply of high-energy phosphate, generated mostly through oxidative metabolism. The latter requires delivery of adequate amounts of oxygen and substrates through the coronary circulation. To exemplify the importance of these processes, the human left ventricular myocardium (assuming an average mass of 166 g for a 70 kg person) receives in the resting state about 1901 of blood and consumes about 201 of O2 during a 24 h period, while it synthesizes about 1.2kg of adenosine triphosphate (ATP), that is, about 7.5 times its mass (which is accomplished by “recycling” of ATP). Different from other organs such as the brain, myocardium relies on several substrates for oxidation. These include free fatty acid, glucose, lactate, and ketone bodies. Selection of a given substrate depends on its concentration in plasma but also on hormone concentrations, such as insulin and norepinephrine. The preferential use of a given substrate, as well as substrate interactions together with overall oxidative metabolism, can now be examined and quantified noninvasively with positron emission tomography (PET). This chapter describes findings with PET on myocardial blood flow and overall oxidative metabolism in the normal human myocardium.
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Schelbert, H.R. (1996). Assessment of Blood Flow and Substrate Metabolism in the Myocardium of the Normal Human Heart. In: Schwaiger, M. (eds) Cardiac Positron Emission Tomography. Developments in Cardiovascular Medicine, vol 165. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-1233-8_10
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DOI: https://doi.org/10.1007/978-1-4613-1233-8_10
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