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Percentage changes in forearm blood flow (FBF) ratio (infused/noninfused) from baseline preceding each drug infusion for three dose levels of (A) acetycholine, (B) sodium nitroprusside, and (C) L-NMMA and (D) coinfusion of acetylcholine and L-NMMA in normotensive control group (▪) and hypertensive patients (▴), respectively. Values are mean (SEM). *P < 0.05, †P < 0.001 for differences between the treatments.
