ATI RN
Cardiovascular Drugs Pharmacology PDF Questions
Question 1 of 5
All of these drugs contain free sulfhydryl groups EXCEPT:
Correct Answer: D
Rationale: The correct answer is D: Trypsin. Trypsin is an enzyme that does not contain free sulfhydryl groups. A: Acetylcysteine contains a free sulfhydryl group, used as a mucolytic agent. B: Ambroxol contains a free sulfhydryl group, used as a mucolytic agent. C: Bromhexine contains a free sulfhydryl group, used as a mucolytic agent.
Question 2 of 5
For digitalis-induced arrhythmias the following drug is favored:
Correct Answer: C
Rationale: The correct answer is C: Lidocaine. Lidocaine is favored for digitalis-induced arrhythmias due to its sodium channel blocking properties, which can help stabilize the heart rhythm. Verapamil (A) is a calcium channel blocker and may worsen arrhythmias. Amiodarone (B) is effective for various arrhythmias but may interact with digitalis. Propranolol (D) is a beta-blocker and may not be as effective as lidocaine for digitalis-induced arrhythmias.
Question 3 of 5
Which of the following cardiovascular system effects refers to a calcium channel blocker?
Correct Answer: D
Rationale: The correct answer is D, as calcium channel blockers have multiple effects on the cardiovascular system. They reduce peripheral vascular resistance by dilating blood vessels, decrease cardiac contractility and output by blocking calcium entry into cardiac muscle cells, and relieve coronary artery spasm by dilating coronary arteries. Therefore, all of the choices (A, B, and C) are correct effects of calcium channel blockers. The other choices are incorrect because they do not encompass all the effects of calcium channel blockers.
Question 4 of 5
Dopamine at low doses influences mainly:
Correct Answer: B
Rationale: The correct answer is B because at low doses, dopamine primarily acts on dopamine receptors, leading to vasodilation of renal and mesenteric vessels. This is known as the renal dose of dopamine. Choices A and C are incorrect because low doses of dopamine do not significantly impact alpha-adrenoreceptors for peripheral vasoconstriction or beta-1 adrenoreceptors for enhancing cardiac output. Choice D is incorrect as dopamine at low doses does not affect all the mentioned receptors simultaneously.
Question 5 of 5
Currently used antithyroid drugs include the following EXCEPT:
Correct Answer: B
Rationale: Step-by-step rationale: 1. Diatrizoate sodium is a contrast agent, not an antithyroid drug. 2. Propylthiouracil, Methimazole, and Potassium perchlorate are antithyroid drugs. 3. Propylthiouracil and Methimazole inhibit thyroid hormone synthesis. 4. Potassium perchlorate blocks iodine uptake by the thyroid gland, reducing hormone production. 5. Thus, Diatrizoate sodium is the correct answer as it is not an antithyroid drug.