Calcium Channel Blockers Are Useful in Treating Certain Cardiac Arrhythmias

question 3

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.

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