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Figure 2 Graph showing the response of the three treatment groups to acetylcholine (Ach). Comparison for each treatment group is made between the basal coronary-artery diameter and diameter at the end of 10^–7 mol/l, 10^–6 mol/l, 10^–5 mol/l and 10^–4 mol/l Ach, respectively. Nitro = nitroglycerin; PTCA = percutaneous transluminal coronary angioplasty. *p = 0.01; **p < 0.0001; ***p = 0.02; ****p = 0.001.