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Directly measured averaged coronary sinus - arterial difference (CS-ART) for total 11C activity (black bars), 11C-palmitate (white bars) and 11CO2 (grey bars) before (A and C) and during adrenergic stimulation of cardiac work (B and D) with phenylephrine (A and B) and dobutamine (C and D). Data is presented as group mean ± SD.
