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NURS 302: Calcium Channel Blockers Chapter 48

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NURS 302: Calcium Channel Blockers Chapter 48

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Questions and Answers

What is the primary role of calcium channels in smooth and cardiac muscle contractile function?

Regulation of potassium outflow

Inhibition of magnesium release

Stimulation of sodium influx

Modulation of intracellular calcium concentrations (correct)

What is the functional linkage between beta-adrenergic receptors and calcium channels in the heart?

Stimulation of potassium efflux

Reduction of sodium channels

Enhancement of calcium channel activity (correct)

Inhibition of calcium influx

What is the primary difference between the sites of action of nifedipine and diltiazem or verapamil?

Nifedipine acts on smooth muscle, while diltiazem and verapamil act on the heart

Nifedipine acts on L-type calcium channels, while diltiazem and verapamil act on T-type calcium channels (correct)

Nifedipine acts on voltage-gated calcium channels, while diltiazem and verapamil act on ligand-gated calcium channels

Nifedipine acts on the heart, while diltiazem and verapamil act on smooth muscle

What is the most common side effect of calcium channel blockers?

Headache Signup and view all the answers

Which of the following drugs should not be administered with calcium channel blockers due to the risk of excessive depression of cardiac contractility?

Beta blockers Signup and view all the answers

Do the precautions about administering calcium channel blockers with other drugs apply to all types of calcium channel blockers?

Only to verapamil or diltiazem Signup and view all the answers

What is the main effect of calcium channel blockers on vascular smooth muscle?

Vasodilation Signup and view all the answers

What is the primary site of action of dihydropyridines?

Arterioles only Signup and view all the answers

What is the effect of verapamil on the SA node?

Reduces heart rate Signup and view all the answers

What is a common side effect of verapamil in older adults?

Constipation Signup and view all the answers

What is the therapeutic use of verapamil in cardiac dysrhythmias?

Atrial flutter and paroxysmal supraventricular tachycardia Signup and view all the answers

What is the net effect of verapamil on cardiac performance?

Little or no net effect on cardiac performance Signup and view all the answers