Final answer:
Verapamil is the cardioactive CCB among the options listed. It helps decrease cardiac contractility and dilate arteries, whereas digoxin and propranol are not CCBs; one is a cardiac glycoside and the other a β-blocker.
Step-by-step explanation:
The cardioactive Calcium Channel Blocker (CCB) from the list provided is verapamil (Calan, Verelan). Calcium Channel Blockers are a group of medications that include drugs like amlodipine, diltiazem, felodipine, nifedipine, nimodipine, nisoldipine, and verapamil. These drugs work by inhibiting the influx of calcium ions into cardiac and smooth muscle cells, leading to a decrease in cardiac contractility and dilation of arteries, which can aid in treating conditions such as hypertension, angina, and some arrhythmias.
While digoxin has cardioactive properties, it is not a calcium channel blocker; it is a cardiac glycoside that increases the force of heart muscle contractions. Propranol (propranolol) is a β-blocker, not a CCB, and works by blocking β-receptors that are associated with vasoconstriction and cardioacceleration. So, out of the options given, only verapamil is a cardioactive CCB.