Final answer:
Calcium channel blockers greatly reduce vasospastic attacks by relaxing and dilating blood vessels.
Step-by-step explanation:
Calcium channel blockers are a class of synthetic drugs that have several effects on the cardiovascular system. One statement that is true regarding the use of calcium channel blockers is that they greatly reduce vasospastic attacks. For example, the calcium channel blocker nifedipine has been shown to effectively prevent and treat vasospastic conditions like Prinzmetal's angina. By blocking the calcium channels in vascular smooth muscle, these medications relax and dilate the blood vessels, thereby reducing vasospasm and improving blood flow.