Ｃａ拮抗剂具有扩张冠状动脉，降低心肌收缩力，抑制心脏传导的作用，同时又作用于血管平滑肌，降低周围血管阻力具有降压作用。因而Ｃａ拮抗剂作为扩张冠状动脉、抗心律失常及降压药物广泛用于心血管领域。其中二氢吡啶类扩血管作用最强，罂粟硷类衍生物对心肌及传导系统... Ca antagonist with the expansion of coronary artery, reducing myocardial contractility, inhibition of cardiac conduction, while acting on vascular smooth muscle, reducing peripheral vascular resistance with antihypertensive effect. Ca antagonists and therefore as a dilated coronary artery, anti-arrhythmia and antihypertensive drugs are widely used in the field of cardiovascular. Which dihydropyridine vasodilator strongest, papaverine derivatives on the heart and conduction system ...