What is the therapeutic effect of a vasodilator?

A. Decreased inflammation: Vasodilators primarily act on vascular smooth muscle to relax blood vessels, reducing systemic vascular resistance. They do not directly target inflammatory pathways, so reducing inflammation is not their therapeutic effect. B. Increased heart rate: While some vasodilators may cause reflex tachycardia as a secondary response to lowered blood pressure, an increased heart rate is not the intended therapeutic effect. The primary goal is to reduce vascular resistance and blood pressure. C. Decreased blood pressure: The main therapeutic effect of vasodilators is the relaxation of arterial and sometimes venous smooth muscle, which lowers systemic vascular resistance. This results in decreased blood pressure, easing the workload on the heart and improving tissue perfusion. D. Increased platelet count: Vasodilators do not affect platelet production or function. Their mechanism of action is centered on vessel relaxation rather than hematologic changes, so platelet count remains unaffected.