Abstract:
BACKGROUND:Modeling of the time-[1-(11)C]acetate activity curve assumes a constant concentration of labeled tricarboxylic acid cycle intermediates and associated metabolites, such as glutamate and aspartate, which may, however, decrease in short-term hibernating myocardium. METHODS AND RESULTS:In 12 anesthetized pigs, [1-(11)C]acetate was injected as a bolus into the cannulated left anterior descending coronary artery during normoperfusion, inotropic stimulation, and early (5 to 45 minutes) and prolonged ischemia (60 to 90 minutes). Regional myocardial oxygen consumption (MVO2, microliters per minute per gram) was measured, and the absence of necrosis was verified by triphenyl tetrazolium chloride staining. Inotropic stimulation increased MVO2 from 52.5+/-7.4 to 195.4+/-36.2 (mean+/-SD) and the rate constant (kmono, minutes[-1]) of [1-(11)C]acetate clearance from 0.094+/-0.018 to 0.322+/-0.076. During early ischemia, MVO2 and kmono were decreased to 24.3+/-8.5 and 0.061+/-0.011, respectively. Kmono closely correlated to MVO2 during normoperfusion, inotropic stimulation, and early ischemia. In short-term hibernating myocardium, however, at an unchanged MVO2, kmono increased toward control values (0.080+/-0.014). Myocardial glutamate and aspartate concentrations (biopsies) decreased to 47+/-26% and 77+/-18%; the peak count rate decreased to 66+/-22% of its respective control value. After correction for the decreases in glutamate and aspartate or in peak count rate, kmono was again decreased (0.050+/-0.016 or 0.052+/-0.014, respectively), and a close relationship to MVO2 was restored. CONCLUSIONS:Kmono correlates to MVO2 in short-term hibernating myocardium when the decreases in aspartate and glutamate or in peak count rate are considered.
journal_name
Circulationjournal_title
Circulationauthors
Schulz R,Kappeler C,Coenen H,Bockisch A,Heusch Gdoi
10.1161/01.cir.97.10.1009subject
Has Abstractpub_date
1998-03-17 00:00:00pages
1009-16issue
10eissn
0009-7322issn
1524-4539journal_volume
97pub_type
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