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全身的扩血管药物,根据它们作用于循环系统的部位,可分为静脉扩张剂,小动脉扩张剂和小动脉静脉扩张剂。虽然硝酸盐主要是扩张静脉,但由于给药的途径和速度不同,可产生不同程度的小动脉扩张。经口或舌下给予硝酸甘油,几乎只扩张静脉,静脉滴注硝酸甘油,可使小动脉中度扩张,但吸入亚硝酸异戍酯主要是扩张小动脉。硝普钠扩张静脉和扩张小动脉的效力大体相等,酚妥拉明主要是扩张小
Systemic vasodilator drugs, according to their role in the circulatory system sites, can be divided into venous dilators, arteriolar dilatation agents and arteriolar venous dilators. Although nitrates are primarily venous dilations, due to the different route and speed of administration, there are different degrees of arteriolar dilatation. Oral or sublingual nitroglycerin, almost only dilated veins, intravenous nitroglycerin, can moderate expansion of arterioles, but inhaled isonisidine nitrous oxide is mainly the dilatation of small arteries. The efficacy of sodium nitroprusside in dilating veins and dilating arterioles was roughly equal, with phentolamine primarily dilated