RN exams pharmacology practice questions set 5

Correct answer:

Aqueous hydrolysis is the correct answer because it is not a mechanism of drug permeation across biological membranes. Permeation refers to the process by which drugs move across cell membranes to reach their site of action, and it includes aqueous diffusion (A), where drugs pass through aqueous channels or pores; lipid diffusion (C), where lipophilic drugs dissolve into the lipid bilayer; and pinocytosis or endocytosis (D), where cells engulf drugs in vesicles. Special carrier transport (original E) involves specific proteins facilitating drug movement. Aqueous hydrolysis (B), however, is a chemical degradation process where a drug reacts with water, breaking chemical bonds (e.g., in esters or amides), not a physical movement across membranes. This distinction is critical in pharmacology, as permeation mechanisms determine bioavailability and tissue distribution, while hydrolysis affects drug stability, often in the gastrointestinal tract or plasma, not membrane crossing.

Correct answer:

Aqueous hydrolysis is the correct answer because it is not a mechanism of drug permeation across biological membranes. Permeation refers to the process by which drugs move across cell membranes to reach their site of action, and it includes aqueous diffusion (A), where drugs pass through aqueous channels or pores; lipid diffusion (C), where lipophilic drugs dissolve into the lipid bilayer; and pinocytosis or endocytosis (D), where cells engulf drugs in vesicles. Special carrier transport (original E) involves specific proteins facilitating drug movement. Aqueous hydrolysis (B), however, is a chemical degradation process where a drug reacts with water, breaking chemical bonds (e.g., in esters or amides), not a physical movement across membranes. This distinction is critical in pharmacology, as permeation mechanisms determine bioavailability and tissue distribution, while hydrolysis affects drug stability, often in the gastrointestinal tract or plasma, not membrane crossing.

Correct answer:

When administering Clopidogrel, it is crucial to monitor for signs of thrombotic thrombocytopenic purpura, bleeding during therapy, and changes in CBC with differential and platelet count. Thrombotic thrombocytopenic purpura is a rare but serious condition associated with Clopidogrel use, characterized by microangiopathic hemolytic anemia, thrombocytopenia, neurological symptoms, fever, and renal dysfunction. Monitoring for signs of thrombotic thrombocytopenic purpura is essential to detect this potentially life-threatening condition early. Monitoring for bleeding helps to assess the risk of hemorrhagic events, a known side effect of Clopidogrel. Additionally, regular monitoring of CBC with differential and platelet count is necessary to evaluate the drug's impact on blood cell counts and detect any abnormalities that may require intervention. Therefore, monitoring all these parameters is vital to ensure patient safety and appropriate management during Clopidogrel therapy.

Correct answer:

Tetracycline, a broad-spectrum antibiotic, requires specific administration instructions to ensure efficacy. It binds to divalent cations like calcium (in milk), magnesium (in antacids), and iron (in supplements), forming insoluble chelates that reduce absorption, rendering it ineffective. The instruction 'Do not take the medication with milk' is critical to avoid this interaction, ensuring therapeutic levels are achieved. Taking it with antacids or iron similarly impairs absorption, making these incorrect and potentially harmful suggestions. Decreasing vitamins is irrelevant, as vitamins don't typically interfere unless combined with minerals. This guidance aligns with tetracycline's pharmacokinetics, emphasizing timing away from meals or supplements containing these ions. Effective discharge teaching prevents treatment failure, especially for infections requiring consistent drug levels, making C the priority instruction for the client's understanding and adherence.

Correct answer:

The patient's symptoms-runny nose and itchy eyes during spring-suggest seasonal allergic rhinitis, where histamine is the main chemical mediator released from mast cells. Cromolyn sodium stabilizes mast cells, preventing histamine release, making it a prophylactic agent ideal for this scenario. Diphenhydramine is an H1 antihistamine that blocks histamine receptors after release, not preventing its release, so it's incorrect. Ranitidine is an H2 blocker, affecting gastric acid secretion, not allergic histamine pathways. Loratadine is another H1 antihistamine, also acting post-release. Theophylline (E) is a bronchodilator, irrelevant here. The question emphasizes preventing release, not blocking effects, so Cromolyn sodium stands out. Its mechanism directly addresses the root cause by stabilizing mast cells before allergen exposure triggers histamine release, offering a preventative rather than symptomatic approach, which aligns with the patient's recurring seasonal issue.

Correct answer:

The correct answer is D. This intervention is appropriate because it addresses the patient's reduced muscle strength following a left-sided stroke and the risk for falling. Assisting the patient into and out of bed regularly helps prevent falls by ensuring safe mobility and reducing the likelihood of accidents. It promotes independence while also providing necessary support. A: Keeping all side rails down at all times may increase the risk of falls as it removes a safety measure that can help prevent falls. B: Encouraging the patient to remain in bed most of the shift can lead to deconditioning and muscle weakness, increasing the risk of falls. C: Placing the patient in a room away from the nurses' station does not directly address the risk for falls and may hinder timely assistance in case of emergencies. In summary, option D is the most appropriate intervention as it addresses the patient's needs, promotes safety, and supports mobility to prevent falls effectively.

Correct answer:

Vancomycin, a glycopeptide antibiotic, is critical for treating MRSA but carries risks of hypersensitivity reactions (e.g., rashes) and nephrotoxicity (e.g., reduced urine output). The nurse's priority when observing an upper body rash and decreased urine output is to hold the next dose and notify the physician . This action prevents further drug administration that could worsen a potential allergic reaction or kidney damage, both serious adverse effects requiring immediate medical evaluation. An X-ray might assess lung involvement in severe cases but isn't the first step for these symptoms. An antihistamine could treat mild itching but risks masking a systemic reaction, delaying critical care. A urine specimen might confirm renal issues but doesn't address the urgency of stopping the drug. Holding the dose ensures patient safety while awaiting physician guidance, aligning with nursing protocols for adverse drug reactions, making A the most prudent and timely action.

Correct answer:

The correct answer is C: Tricyclic antidepressants cause serious cardiac dysrhythmias if an overdose occurs. Tricyclic antidepressants have a narrow therapeutic index, meaning that even a small overdose can lead to severe toxicity, including cardiac dysrhythmias that can be life-threatening. This risk of overdose toxicity is a significant concern with tricyclic antidepressants and contributes to their decreased use compared to SSRIs. A: SSRIs having fewer sexual side effects is not the primary reason for their wider use compared to tricyclic antidepressants. While this may be a consideration for some patients, it is not the main factor influencing prescribing patterns. B: Drug-food interactions are indeed a concern with tricyclic antidepressants, but it is not the primary reason why SSRIs are more widely prescribed today. While SSRIs may have a lower risk of drug-food interactions, it is not the main driving factor behind their increased use. D: While SSRIs may have

Correct answer:

The correct answer is C: Obtain an order for a spacer device. This intervention is most appropriate as a spacer device can help improve the delivery of medication from the MDI, even if the patient is unable to coordinate inhalation with activation. The spacer device acts as an intermediary between the inhaler and the patient, allowing the medication to be inhaled more effectively. This ensures that the patient receives the full dose of the medication. Incorrect answers: A: Notifying the doctor that the patient is unable to use the MDI does not directly address the issue of coordination and does not provide a solution. B: Obtaining an order for a peak flow meter is not the most appropriate intervention in this scenario, as it does not address the patient's inability to coordinate the use of the MDI. D: Asking the prescriber if the medication can be given orally is not necessary if the patient can still benefit from using the MDI with the help of a spacer device.

Correct answer:

The correct answer is A: Diet and exercise program. This is because a client's diet and exercise program directly impact their physical health and well-being, making it an important factor to consider when determining assessment priorities. Understanding their dietary habits and level of physical activity can help identify potential health risks or areas for improvement. Choices B, C, and D are incorrect because they do not directly relate to the client's physical health and well-being, which are crucial factors in determining assessment priorities. Standing in the community (B) may influence social interactions but does not necessarily impact assessment priorities. Ability to pay for services (C) relates to financial considerations rather than health assessment priorities. Developmental stage (D) may be important for understanding the client's cognitive and emotional development, but it is not as directly relevant to assessment priorities as diet and exercise.