What is the primary function of calcium channel blockers in cardiac therapy?

Calcium channel blockers are primarily used in cardiac therapy to decrease blood pressure. They achieve this by blocking calcium entry into vascular smooth muscle cells, leading to relaxation and dilation of blood vessels. This vasodilation results in a reduction in systemic vascular resistance, which ultimately lowers blood pressure.

Additionally, by reducing the workload on the heart and decreasing myocardial contractility, calcium channel blockers can also enhance overall cardiac function in certain patients. However, their most recognized and clinically significant role in managing conditions like hypertension and certain types of angina is related to their vasodilatory effects resulting in decreased blood pressure.

Understanding this function is crucial for anyone studying cardiac therapies, as it highlights how calcium channel blockers can be strategically used to manage cardiovascular issues, such as hypertension and angina, without directly increasing heart rate or oxygen demand.