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Figure 1 Percent changes in left anterior descending artery (LAD) diameters from baseline values in response to intracoronary infusion of graded dose (50 µg, 100 µg) of acetylcholine (ACh) and to 0.3 mg of nitroglycerin (NTG) categorized by tertiles of insulin sensitivity in patients with normal coronary angiogram (n = 36). IS = insulin sensitive (open bars); BL = borderline (solid bars); IR = insulin resistant (hatched bars). *p < 0.05 vs. IS. p < 0.05 vs. BL.