RN exams pharmacology practice questions set 22

Correct answer:

Step-by-step rationale for why choice A is correct: 1. Hydrocodone is an opioid analgesic. 2. Opioid analgesics work by binding to opioid receptors in the brain. 3. By binding to these receptors, hydrocodone modulates pain perception and response. 4. This mechanism of action is how hydrocodone alleviates pain. Summary of why the other choices are incorrect: B: Inhibiting the reuptake of serotonin and norepinephrine - This describes the mechanism of action for antidepressants, not opioids like hydrocodone. C: Inhibiting prostaglandin synthesis - This is the mechanism of action for nonsteroidal anti-inflammatory drugs (NSAIDs), not opioids. D: Blocking sodium channels in peripheral nerves - This is a mechanism seen with local anesthetics, not opioids.

Correct answer:

Rationale for the correct answer (C - Enalapril): 1. Enalapril is a prodrug that requires conversion to its active form, enalaprilat, in the liver. 2. Enalaprilat has potent ACE inhibitory effects, making it the active metabolite responsible for the drug's therapeutic action. 3. The conversion process enhances the drug's bioavailability and ensures a consistent pharmacological response. Summary of why other choices are incorrect: A: Labetalol is not converted to an active metabolite after absorption; it exerts its effects directly. B: Clonidine acts directly on alpha-2 adrenergic receptors without requiring conversion to an active form. D: Nifedipine is a calcium channel blocker that does not need metabolic activation for its pharmacological effects.

Correct answer:

The correct answer is B: Trigeminal nerve. Sumatriptan is a serotonin receptor agonist that acts on serotonin receptors in the trigeminal nerve to reduce inflammation and pain associated with migraines. The trigeminal nerve is a key player in the pathophysiology of migraines, transmitting pain signals from blood vessels and meninges to the brain. The other choices (A: Nucleus accumbens, C: Vestibular nuclei, D: Chemoreceptor trigger zone) are not directly involved in the pathophysiology of migraines or the mechanism of action of sumatriptan. The nucleus accumbens is primarily associated with reward and motivation, the vestibular nuclei are involved in balance and spatial orientation, and the chemoreceptor trigger zone is related to the regulation of vomiting.

Correct answer:

The correct answer is to 'Avoid salt substitutes.' ACE Inhibitors can increase potassium levels, so clients should avoid salt substitutes that contain potassium to prevent hyperkalemia, which is a potential side effect of ACE Inhibitors. Choice B 'Take this medication at bedtime' is incorrect as ACE Inhibitors are usually taken in the morning to avoid nocturnal diuresis. Choice C 'Avoid foods high in potassium' is incorrect because although ACE Inhibitors can increase potassium levels, clients are generally encouraged to consume potassium-rich foods in moderation unless contraindicated. Choice D 'Limit your fluid intake' is also incorrect as ACE Inhibitors do not typically require fluid restrictions unless specified by a healthcare provider for other reasons.

Correct answer:

The correct answer is B: Trigeminal nerve. Sumatriptan is a serotonin receptor agonist that acts on serotonin receptors in the trigeminal nerve to reduce inflammation and pain associated with migraines. The trigeminal nerve is a key player in the pathophysiology of migraines, transmitting pain signals from blood vessels and meninges to the brain. The other choices (A: Nucleus accumbens, C: Vestibular nuclei, D: Chemoreceptor trigger zone) are not directly involved in the pathophysiology of migraines or the mechanism of action of sumatriptan. The nucleus accumbens is primarily associated with reward and motivation, the vestibular nuclei are involved in balance and spatial orientation, and the chemoreceptor trigger zone is related to the regulation of vomiting.

Correct answer:

The correct answer is A: Inhibiting the reuptake of serotonin in the brain. Fluoxetine, a selective serotonin reuptake inhibitor (SSRI), works by blocking the reuptake of serotonin in the brain, leading to increased levels of serotonin available in the synaptic cleft. This helps regulate mood and alleviate symptoms of depression. Summary: - B: Increasing the release of norepinephrine and dopamine: This is incorrect as fluoxetine specifically targets serotonin reuptake, not norepinephrine or dopamine. - C: Blocking serotonin receptors: This is incorrect as fluoxetine does not block serotonin receptors but rather inhibits its reuptake. - D: Inhibiting the reuptake of dopamine: This is incorrect as fluoxetine primarily affects serotonin reuptake, not dopamine.

Correct answer:

The most helpful test in determining the response to highly active antiretroviral therapy (HAART) in an HIV-positive client is the viral load test. This test measures the amount of HIV in a person's blood, indicating how well the medication is working to suppress the virus. A decrease in the viral load over time signifies a positive response to the treatment, while an increase may indicate treatment failure or drug resistance development. Monitoring the viral load is crucial in managing HIV and making informed decisions about the continuation or modification of the antiretroviral therapy regimen. Rapid HIV antigen tests, Western Blot analysis, and white blood cell count do not directly assess the response to HAART in the same way that viral load testing does.

Correct answer:

The correct answer is A: Tachyphylaxis. Tachyphylaxis refers to a rapid decrease in response to a drug after repeated administration. In this case, the patient initially felt better on the drug regimen but now feels it has stopped working, indicating a sudden loss of effectiveness. Incorrect Choices: B: Side effect - Side effects are unintended, secondary effects of a drug that can occur at therapeutic doses, not related to a sudden loss of efficacy. C: Adverse effect - Adverse effects are harmful or undesired effects that may occur with a drug but do not necessarily mean the drug has stopped working. D: Tolerance - Tolerance is a gradual decrease in response to a drug with repeated use, not a sudden loss of effectiveness as described in the scenario.

Correct answer:

The correct answer is B: Azithromycin. Azithromycin is a macrolide antibiotic, which is an alternative to penicillin for patients with a penicillin allergy. It is effective against strep throat and does not cross-react with penicillin allergies. Azithromycin is a safe and appropriate choice for this patient. A: Penicillin VK is not appropriate for a patient with a known penicillin allergy, as it may cause a similar allergic reaction. C: Amoxicillin is also a penicillin-based antibiotic and may lead to a similar allergic reaction in a patient with a penicillin allergy. D: Cefadroxil is a cephalosporin antibiotic, which is structurally related to penicillin and can cross-react with penicillin allergies. It would not be a suitable choice for this patient.

Correct answer:

The correct action for the nurse to take in this situation is to contact the registered nurse. When a client with coronary artery disease experiences chest pain and does not achieve relief after the initial administration of nitroglycerin, it is crucial to inform the registered nurse promptly. Following the usual guideline for nitroglycerin administration, the nurse may administer a second tablet after assessing the client's pain level. The nurse should continue to assess the client's pain and monitor vital signs before each dose administration. Calling a code blue is not warranted at this point, as the client's condition does not indicate an immediate life-threatening emergency. Contacting the client's family is not necessary unless requested by the client.