When you have atrial fibrillation, the two upper chambers of your heart (atria) don't beat in sync with the two lower chambers (ventricles). This makes your heart beat out of rhythm and sometimes very ...

What Are Calcium Channel Blockers? Calcium makes your heart and blood vessels work harder to pump. Calcium channel blockers work by slowing the movement of calcium into the cells of the heart and ...

Calcium channel blockers are medications used to lower blood pressure. They work by increasing the flow of blood and oxygen to the heart. There are two types of calcium channel blockers that help ...