CVT CVT Pharmacology & Cardiac Medications

Question 1

Which class of antiarrhythmic drugs works primarily by blocking sodium channels to stabilize cardiac cell membranes?

Accepted Answer

Class I

Answer

Class I antiarrhythmics (e.g., lidocaine, flecainide) block fast sodium channels, slowing conduction velocity and stabilizing excitable membranes.

Question 2

Adenosine is used in the clinical setting primarily to:

Accepted Answer

Terminate paroxysmal supraventricular tachycardia

Answer

Adenosine transiently blocks AV nodal conduction to terminate reentrant SVT, restoring sinus rhythm within seconds.

Question 3

Which anticoagulant is most commonly used during cardiac catheterization to prevent thrombus formation?

Accepted Answer

Heparin

Answer

Unfractionated heparin is the standard anticoagulant for procedural anticoagulation during cardiac catheterization due to its rapid onset and reversibility.

Question 4

Nitroglycerin relieves angina primarily by:

Accepted Answer

Reducing preload and afterload through venous and arterial dilation

Answer

Nitroglycerin is a nitrate that donates nitric oxide, causing smooth muscle relaxation, venodilation, and reduced preload, decreasing myocardial oxygen demand.

Question 5

A patient receiving digoxin therapy develops nausea, visual disturbances, and bradycardia. The CVT should suspect:

Accepted Answer

Digoxin toxicity

Answer

Classic digoxin toxicity presents with GI symptoms, visual changes (yellow-green halos), and bradyarrhythmias due to enhanced vagal tone and decreased AV conduction.

(CVT) Cardiovascular Technologist Certification Practice Test

(CVT) Cardiovascular Technologist Certification Practice Test

CVT CVT Pharmacology & Cardiac Medications