ACLS ACLS Pharmacology & Medications 3

Question 1

When administering adenosine to a patient receiving theophylline, which adjustment is necessary?

Accepted Answer

Increase the adenosine dose as theophylline antagonizes it

Answer

Theophylline blocks adenosine receptors, so higher doses of adenosine may be required to achieve the desired effect.

Question 2

Which drug should be avoided in a patient with Wolff-Parkinson-White (WPW) syndrome who presents with rapid AF?

Accepted Answer

AV nodal blocking agents (diltiazem, verapamil)

Answer

AV nodal blocking agents are contraindicated in WPW with AF because they can accelerate conduction through the accessory pathway, precipitating VF.

Question 3

What is the primary mechanism of action of epinephrine that makes it useful during cardiac arrest?

Accepted Answer

Alpha-adrenergic vasoconstriction raising coronary perfusion pressure

Answer

Epinephrine's alpha-adrenergic effect causes systemic vasoconstriction, which increases aortic diastolic pressure and coronary perfusion pressure during CPR.

Question 4

Which calcium channel blocker is preferred for IV administration in stable supraventricular tachycardia per ACLS?

Accepted Answer

Verapamil

Answer

Verapamil 2.5–5 mg IV is the preferred calcium channel blocker for treating stable narrow-complex SVT in ACLS.

Question 5

What is the recommended dose of dopamine used for hemodynamically significant bradycardia unresponsive to atropine?

Accepted Answer

2–20 mcg/kg/min

Answer

Dopamine is infused at 2–20 mcg/kg/min as a chronotropic and vasopressor agent for bradycardia unresponsive to atropine.

ACLS Practice Test

ACLS Practice Test

ACLS ACLS Pharmacology & Medications 3