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Figure 5 Coronary sinus–arterial difference in TBARS at baseline, during infusion of 50 µg of ACh alone and during infusion of vitamin C plus 50 µg of ACh in patients with coronary spastic angina (CSA, n = 17) and in control patients (Control, n = 23). Data from patients with coronary spastic angina in whom spasm in the LAD and LCx was provoked by infusion of 100 µg, but not 50 µg, of ACh were included in the analysis.