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Figure 1 Forearm blood flow (FBF) percent increase above basal induced by acetylcholine and bradykinin during saline, N^G-monomethyl-L-arginine (L-NMMA), or sulfaphenazole in normotensive subjects (n = 12) and essential hypertensive patients (n = 12). The lower panels show FBF percent increase above basal induced by sodium nitroprusside (SNP) with or without sulfaphenazole. Data shown as mean ± SEM. *p < 0.001; p < 0.05; p < 0.01 (by analysis of variance for repeated measures and Scheffé's test).