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Figure 2 Maximal forearm blood flow after the sublingual administration of NTG in normotensive control subjects (n = 47), hypertensive patients treated with calcium antagonists (n = 175), ACE inhibitors (n = 51), beta-blockers (n = 14) and diuretic agents (n = 10) and untreated hypertensive patients (n = 46). Nitroglycerin-induced vasodilation was similar in all six groups.