MSN 611 : Clinical Pharm & Intervention for APRNs - NKU

Correct Answer:

D - bupropion (Wellbutrin)

Explanation of the Correct Answer:

Bupropion (Wellbutrin) is known to cause false positives on urine drug screens, particularly for amphetamines. This is due to the chemical structure of bupropion, which shares similarities with amphetamines and can be mistaken for them on certain types of drug tests. It is a common issue for patients taking bupropion, as the urine drug screen may show a positive result for amphetamine use even if the patient is not using amphetamines. This can occur because bupropion is metabolized into compounds that may cross-react with amphetamine assays.

Why the Other Options Are Incorrect:

A - Metformin (Glucophage):

Metformin is used to treat type 2 diabetes and is not typically associated with causing false positives on urine drug screens. It does not have a chemical structure that would cross-react with common drug screen assays, making it unlikely to produce a false positive result.

B - Alprazolam (Xanax):

Alprazolam (Xanax) is a benzodiazepine, and while it can cause a positive result on a drug screen for benzodiazepines, it does not generally cause false positives for other substances like amphetamines or opiates. Drug tests designed to detect benzodiazepines will accurately identify alprazolam use, without cross-reacting to other drug classes.

C - Loratadine (Claritin):

Loratadine (Claritin) is an antihistamine used for allergies and is not known to cause false positives on urine drug screens. Loratadine does not have the chemical properties to interfere with common drug screen assays, so it is unlikely to cause false positive results for other drugs.

Correct Answer:

B - IV Hydration.

Explanation of the Correct Answer:

Tumor lysis syndrome (TLS) is a potentially life-threatening condition that occurs when a large number of tumor cells are destroyed rapidly, releasing their contents into the bloodstream. This can lead to hyperkalemia, hyperphosphatemia, hypocalcemia, and elevated uric acid levels, which can cause renal failure, arrhythmias, and other complications. IV hydration is a critical management strategy to prevent or treat TLS, as it helps to flush out excess potassium, phosphate, and uric acid through the kidneys, preventing renal damage and electrolyte imbalances.

Why the Other Options Are Incorrect:

A - Dosage reduction:

While dosage reduction may be considered in certain scenarios, it is not the primary strategy for managing tumor lysis syndrome. TLS requires immediate intervention, including hydration and sometimes medications like allopurinol or rasburicase to control uric acid levels, not just reducing the dosage of chemotherapy.

C - Treatment disruption:

Disrupting cancer treatment is not the recommended approach for managing TLS. On the contrary, TLS occurs in response to aggressive tumor cell lysis due to chemotherapy or other cancer treatments. The goal is to manage the consequences of TLS while continuing to treat the underlying leukemia.

D - Drug rotation:

Drug rotation is not relevant to the management of tumor lysis syndrome. TLS is a result of the rapid destruction of cancer cells, and the key management strategies involve supportive care (like hydration) and pharmacologic interventions to control electrolyte imbalances and prevent renal failure.

Correct Answer:

D - folic acid and iron

Explanation of the Correct Answer:

Folic acid and iron are essential micronutrients that are routinely prescribed for pregnant women to support both maternal health and fetal development. Folic acid is critical during early pregnancy to prevent neural tube defects such as spina bifida and anencephaly. It is recommended that all women of childbearing age take folic acid supplements even before conception and throughout pregnancy, especially during the first trimester.

Iron supplementation is important to prevent and treat iron-deficiency anemia, which is common during pregnancy due to increased blood volume and iron demands for fetal development. Adequate iron helps ensure proper oxygen delivery to both maternal and fetal tissues and reduces the risk of preterm delivery and low birth weight.

Why the Other Options Are Incorrect:

A - Folic acid and vitamin C:

While folic acid is crucial, vitamin C alone is not a standard prescribed micronutrient for pregnancy. Vitamin C does play a role in iron absorption and immune function, but it is generally obtained adequately through diet, and supplementation is not a primary focus in prenatal care unless there is a specific deficiency.

B - Iron and magnesium:

Iron is necessary, but magnesium supplementation is not routinely prescribed unless a deficiency is detected. Magnesium is important for many physiological processes, but it is typically available through a normal diet and prenatal vitamins without the need for a separate prescription.

C - Potassium and vitamin K:

Neither potassium nor vitamin K is routinely prescribed as a standard part of prenatal supplementation. Potassium is important for fluid balance and normal cell function, and vitamin K is essential for blood clotting, but deficiencies are rare, and supplementation is not a primary prenatal focus unless there are specific medical indications.

Correct Answer:

A - Increased deep vein thrombosis risk

Explanation of the Correct Answer:

The medication being referred to is likely raloxifene, a selective estrogen receptor modulator (SERM), which is commonly used for the prevention and treatment of osteoporosis in postmenopausal women. Raloxifene has an estrogen-agonistic effect on bone, which helps to increase bone mass and mineralization, thus preventing fractures. However, one of the most common adverse effects associated with raloxifene and other SERMs is an increased risk of deep vein thrombosis (DVT) and other thromboembolic events (e.g., pulmonary embolism). This is because SERMs have estrogen-like effects on blood coagulation, leading to an increased risk of clot formation.

Why the Other Options Are Incorrect:

B - Gastrointestinal bleeding:

While gastrointestinal issues can occur with various medications, raloxifene and other SERMs are not typically associated with gastrointestinal bleeding. Drugs like aspirin or nonsteroidal anti-inflammatory drugs (NSAIDs) are more likely to cause gastrointestinal bleeding due to their effects on the gastric mucosa.

C - Renal toxicity:

Raloxifene does not cause renal toxicity as a common adverse effect. Renal toxicity is more commonly associated with drugs like NSAIDs, certain antibiotics, or chemotherapeutic agents, but it is not a prominent concern with raloxifene.

D - Liver dysfunction:

Liver dysfunction is not a frequent adverse effect of raloxifene. While liver function tests may be monitored during treatment with any medication, liver dysfunction is more commonly seen with drugs like statins, acetaminophen, or methotrexate rather than with raloxifene.

Correct Answer:

D - Fatigue.

Explanation of the Correct Answer:

Fatigue is a common CNS side effect of first-generation antihistamines, particularly in elderly patients. These medications cross the blood-brain barrier and exert sedative effects, leading to drowsiness, fatigue, and reduced alertness. In older adults, this can significantly increase the risk of falls, confusion, and impaired cognitive function. Fatigue is one of the most important side effects to be aware of in this population.

Why the Other Options Are Incorrect:

A - Visual disturbance:

Visual disturbances like blurred vision can occur due to the anticholinergic effects of first-generation antihistamines, but they are typically peripheral effects (affecting the eyes) rather than CNS side effects. Visual disturbances are not a primary concern for elderly patients compared to fatigue.

B - Tinnitus:

Tinnitus is not a typical CNS side effect of antihistamines. It is more commonly associated with other conditions or medications (e.g., ototoxic drugs like aminoglycosides) rather than antihistamines, which do not usually affect hearing or cause ringing in the ears.

C - Postural HTN:

First-generation antihistamines are not typically associated with postural hypertension. In fact, they are more likely to cause sedation, fatigue, and dizziness, which can increase the risk of falls. Postural hypotension (low blood pressure) may occur in some antihistamine users, but hypertension is not a recognized side effect.

Correct Answer:

D - Ramelteon.

Explanation of the Correct Answer:

Ramelteon is a melatonin agonist used as an anxiolytic, sedative, and hypnotic. It specifically targets melatonin receptors (MT1 and MT2) in the brain, which are involved in regulating the sleep-wake cycle. By binding to these receptors, ramelteon helps to promote sleep onset, making it effective for the treatment of insomnia, particularly in patients who have difficulty falling asleep. Unlike other sedatives, ramelteon does not have the addictive potential associated with benzodiazepines or other hypnotics.

Why the Other Options Are Incorrect:

A - Flurazepam:

Flurazepam is a benzodiazepine used to treat insomnia, particularly for sleep onset and maintenance. It does not act as a melatonin agonist. Instead, it enhances the effects of the neurotransmitter gamma-aminobutyric acid (GABA), which has inhibitory effects on the central nervous system.

B - Phenobarbital:

Phenobarbital is a barbiturate that acts as a central nervous system depressant. Like benzodiazepines, it enhances GABAergic activity but does not act as a melatonin agonist. It is not typically used for anxiety or insomnia due to its potential for dependence and side effects.

C - Zolpidem:

Zolpidem is a non-benzodiazepine hypnotic that works by enhancing GABAergic activity in the brain. It is commonly used for short-term treatment of insomnia, particularly for helping patients fall asleep. However, it does not act on melatonin receptors and is not a melatonin agonist.

Correct Answer:

B - Has decreased risk of resistance.

Explanation of the Correct Answer:

Multiple drug combination treatment for tuberculosis (TB) is essential to decrease the risk of developing drug resistance. TB treatment typically involves using a combination of drugs (e.g., isoniazid, rifampin, pyrazinamide, and ethambutol) to target the bacterium from different angles, preventing the bacteria from developing resistance to any one drug. By using multiple drugs, the likelihood that a resistant strain will develop is significantly reduced, ensuring more effective and sustained treatment outcomes.

Why the Other Options Are Incorrect:

A - Eliminates the need for the continuation phase:

Combination therapy does not eliminate the need for the continuation phase in TB treatment. The continuation phase is still required to ensure that all bacteria are eradicated and to prevent relapse. The initial intensive phase typically involves more drugs and is followed by the continuation phase, which uses fewer drugs but for a longer period.

C - Usually administered using once-weekly dosing:

TB treatment regimens generally do not use once-weekly dosing. While some TB regimens may involve weekly dosing, standard practice involves daily or at least several times a week administration, particularly in the intensive phase of treatment. Once-weekly dosing is more common in specific circumstances, such as for certain drug-sensitive TB cases or in directly observed therapy (DOT) programs.

D - Associated with low risk of drug-drug interactions:

Multiple drug therapy for TB often increases the risk of drug-drug interactions, particularly when multiple antibiotics and other medications (e.g., for HIV or other comorbid conditions) are involved. This increased risk requires careful management and monitoring to prevent adverse effects or reduced efficacy of the drugs.

Correct Answer:

C - Oxybutynin (Ditropan)

Explanation of the Correct Answer:

Oxybutynin (Ditropan) is an antimuscarinic agent that is commonly prescribed for the management of overactive bladder (OAB). It works by inhibiting the action of acetylcholine at muscarinic receptors in the bladder, which reduces bladder muscle contractions and helps to decrease urinary urgency, frequency, and incontinence. Oxybutynin is one of the most frequently used medications for treating OAB symptoms and is a first-line therapy in many cases.

Why the Other Options Are Incorrect:

A - Prazosin (Minipress):

Prazosin (Minipress) is an alpha-1 adrenergic blocker, not an antimuscarinic agent. It is primarily used to treat hypertension and benign prostatic hyperplasia (BPH), not overactive bladder. Prazosin works by relaxing the smooth muscles in blood vessels and the prostate, not by targeting the muscarinic receptors in the bladder.

B - Bethanechol (Urecholine, Myotonachol):

Bethanechol is a muscarinic agonist, not an antimuscarinic agent. It is used to treat urinary retention and works by stimulating muscarinic receptors to increase bladder contraction. However, it would not be appropriate for a woman with overactive bladder, where the problem is excessive bladder contraction, as opposed to retention. Bethanechol would exacerbate the symptoms of OAB.

D - Flavoxate (Urispas):

Flavoxate (Urispas) is another antispasmodic agent that can be used to treat symptoms of overactive bladder. However, it is less commonly prescribed in comparison to oxybutynin. Flavoxate works by relaxing the smooth muscle of the bladder and reducing spasms, but oxybutynin is typically preferred due to its well-established efficacy and safety profile.

Correct Answer:

C - Increase effectiveness of local treatment.

Explanation of the Correct Answer:

Systemic chemotherapy given prior to surgery or radiation is known as neoadjuvant therapy. The primary goal of neoadjuvant chemotherapy is to shrink the tumor or reduce its spread, making it easier to surgically remove or target with radiation. By reducing tumor size or extent, it enhances the effectiveness of subsequent local treatments, such as surgery or radiation therapy, which can improve overall treatment outcomes.

Why the Other Options Are Incorrect:

A - Prevent recurrence of CA:

While neoadjuvant chemotherapy can reduce the size of a tumor and make it more amenable to surgery or radiation, it does not directly prevent cancer recurrence. Recurrence prevention is more directly related to adjuvant therapy (treatment given after surgery or radiation to kill remaining cancer cells) and ongoing surveillance.

B - Improve survival:

The primary objective of neoadjuvant chemotherapy is to improve the effectiveness of local treatments, rather than directly improving survival. While neoadjuvant therapy may indirectly improve survival by enhancing surgical or radiation outcomes, survival benefits are typically more strongly associated with adjuvant therapies or long-term treatment plans.

D - Use body's own immune system to kill off cancerous cells:

Neoadjuvant chemotherapy does not rely on the body’s immune system to fight cancer. It works by directly targeting and killing rapidly dividing cancer cells. Immunotherapy, a different class of treatment, utilizes the body’s immune system to attack cancer cells, but it is not the mechanism of action for chemotherapy.