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Calcium Channel Blockers Are Useful in Treating Certain Cardiac Arrhythmias

Question 4

Multiple Choice

Calcium channel blockers are useful in treating certain cardiac arrhythmias because they:

A) decrease the rate of discharge of the sinoatrial (SA) node.
B) increase conduction velocity through the atrioventricular (AV) node.
C) block the effects of catecholamines (epinephrine,norepinephrine) on cardiac tissues.
D) inhibit the sodium's ability to excite cardiac membranes.
E) none of the above;calcium channel blockers are not used to treat arrhythmias.

Correct Answer: