Although two types of Ca<sup>2+</sup> channels are found to occur in the cardiovascular system, very little is known about one of them, primarily because a pharmacological blocking agent has been lacking. The enigmatic transient (T)-type Ca<sup>2+</sup> channel has finally been recognized by a selective Ca<sup>2+</sup> antagonist. The novel tetralol Ca<sup>2+</sup> antagonist, mibefradil, is a selective T-type Ca<sup>2+</sup> channel blocker that produces effective vasodilatation with additional inhibitory actions on blood vessel wall and left ventricular thickening. The availability of a blocking agent has begun to reveal the significance of T-type Ca<sup>2+</sup> channel signals. Selective T-type Ca<sup>2+</sup> channel blockade characteristics include vascular selectivity, freedom from negative cardiac inotropism, consistent and predictable reduction in heart rate, reduction in subendothelial proliferation, and increased survival of severely hypertensive and heart failure animal models. Mibefradil increases coronary blood flow without increasing myocardial oxygen consumption, and by decreasing he
📖 افتح في inklap 🔗 DOI 📮 اطلب بحثاً