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Figure 4 Transcardiac gradient in coronary blood pH at baseline; immediately after the first, second, and third balloon inflations (Infl-1, Infl-2, and Infl-3); and immediately before the second and third inflations (Pre-Infl-2 and Pre-Infl-3) in control and adenosine-treated patients. Because arterial pH did not change significantly, the differences in the gradient indicate changes in great cardiac vein pH. Brackets indicate the pairwise comparisons that were performed. Data are means ± SEM. A-GCV = aorta-great cardiac vein.