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Effect of amlodipine treatment on the vasodilatory response to acetylcholine (A). Intra-arterial infusion of vitamin C in amlodipine treated hypertensive group did not change the forearm blood flow response to acetylcholine (B). Co-infusion of L-NMMA, an inhibitor of nitric oxide synthase, blunted forearm blood flow response to acetylcholine (C).
