Abstract
The effect of nisoldipine, a dihydropyridine Ca2+ antagonist, on the platelet cytosolic Ca2+ concentration ([Ca2+]i), platelet aggregation, and various coagulation and fibrinolysis parameters was assessed in normotensive patients with coronary artery disease (CAD). Eleven patients with angiographically confirmed CAD (4 men, 7 women aged 67.3 +/- 5.4 years) were administered nisoldipine at 10 mg/day for two weeks. The [Ca2+]i was determined by use of fura2-loaded platelets, platelet aggregation was measured with an aggregometer, and coagulation/fibrinolysis parameters were measured by standard methods. Nisoldipine did not significantly affect blood pressure or heart rate. However, the [Ca2+]i decreased significantly (P<0.05) and platelet aggregation was also significantly inhibited. Plasma D-dimer levels decreased significantly (P<0.01). Thus, nisoldipine not only suppressed platelet activation but also affected the coagulation system, suggesting that it is not only a vasodilator and platelet inhibitor but also an antithrombotic agent.
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