A child is prescribed phenytoin (Dilantin) chewable tablets for his seizure diagnosis. Monitoring for this drug includes assessing:
Heart rate at each visit, discontinue therapy when heart rate <60 beats per minute
For good oral hygiene, as therapy can cause gingival hyperplasia
CBC due to black box warning for agranulocytosis
For pedal edema due to fluid retention risk
The Correct Answer is B
Anticonvulsants such as Phenytoin (Dilantin) are used in seizure management to stabilize neuronal membranes and prevent abnormal electrical activity in the brain. While effective, phenytoin is associated with several long-term adverse effects that require ongoing monitoring and patient education. One of the most characteristic and common side effects is gingival overgrowth, which can be minimized with proper oral care. Nursing care focuses on preventing complications and promoting adherence to therapy.
Rationale:
A. Heart rate monitoring and discontinuation of Phenytoin (Dilantin) based on bradycardia is not a standard monitoring parameter. Phenytoin toxicity primarily affects the central nervous system (e.g., nystagmus, ataxia, confusion) rather than causing clinically significant bradycardia. Heart rate thresholds are not used to guide discontinuation of this medication.
B. Maintaining good oral hygiene is essential because Phenytoin (Dilantin) is well known to cause gingival hyperplasia due to fibroblast proliferation and collagen accumulation in the gums. Regular brushing, flossing, and dental care help reduce plaque buildup and minimize the severity of gum overgrowth. This is a key nursing teaching point for patients on long-term therapy, especially children.
C. While CBC monitoring may be done in some anticonvulsant therapies, agranulocytosis is not a classic black box warning for Phenytoin (Dilantin). More commonly, phenytoin is associated with rare but serious effects such as blood dyscrasias, including leukopenia or aplastic anemia, but routine monitoring focuses more on drug levels and neurological toxicity.
D. Pedal edema due to fluid retention is not a typical adverse effect of Phenytoin (Dilantin). While some anticonvulsants may cause weight changes or metabolic effects, phenytoin is primarily associated with neurologic, dermatologic, and gingival side effects rather than fluid overload. Monitoring for edema is not a key priority in patients receiving this medication.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Hormone replacement therapy (HRT) is used to manage moderate to severe menopausal symptoms such as hot flashes, night sweats, and genitourinary syndrome of menopause. Current evidence and updated FDA-aligned guidance emphasize the importance of timing when initiating therapy because cardiovascular and thrombotic risks vary depending on how long after menopause treatment begins. The “timing hypothesis” supports starting HRT closer to menopause onset for maximum benefit and lower risk. This is a key principle in modern menopausal care.
Rationale:
A. Starting HRT before 65 years of age or within 5 years of menopause is narrower than current recommended guidance. While early initiation is beneficial, evidence supports a broader safe window of up to 10 years post-menopause or before age 60. Limiting to 5 years may exclude patients who could still benefit safely from therapy.
B. 60 years of age or within 10 years of menopause is the currently supported guideline based on updated evidence and FDA-aligned recommendations. Hormone replacement therapy is most beneficial when started during this “window of opportunity,” where risks of cardiovascular disease, stroke, and thromboembolism are lower and symptom relief and bone protection benefits are maximized.
C. Starting within 1 year of menopause or before age 50 is overly restrictive and not evidence-based as a general guideline. While earlier initiation can be appropriate, limiting therapy to such a narrow timeframe does not reflect current clinical recommendations and excludes many symptomatic patients who may still benefit safely within a broader window.
D. HRT is not contraindicated in all menopausal patients. In fact, Hormone replacement therapy is an approved and effective treatment for vasomotor symptoms and prevention of bone loss in appropriately selected patients. Contraindicating all use is incorrect and ignores well-established benefits when therapy is individualized and appropriately timed.
Correct Answer is B
Explanation
Carbamazepine (Tegretol) is an anticonvulsant used for seizure disorders, trigeminal neuralgia, and mood stabilization. It has a narrow therapeutic index and is associated with potentially serious hematologic adverse effects due to bone marrow suppression. Because of these risks, ongoing laboratory monitoring is required to ensure patient safety during long-term therapy. Nursing and provider follow-up focus heavily on blood dyscrasias and drug toxicity surveillance.
Rationale:
A. Annual eye examinations for cataracts are not a standard monitoring requirement for Carbamazepine (Tegretol). While some anticonvulsants may have rare ocular side effects, cataract formation is not a recognized routine long-term complication of carbamazepine. Therefore, routine ophthalmologic screening is not part of standard monitoring guidelines.
B. Complete blood count every three to four months is essential because Carbamazepine (Tegretol) can cause serious hematologic effects such as leukopenia, agranulocytosis, and aplastic anemia. Regular CBC monitoring helps detect early signs of bone marrow suppression, allowing timely intervention before severe complications develop. This is a key safety measure in long-term therapy.
C. Routine troponin testing is not indicated for patients taking Carbamazepine (Tegretol) because it is not associated with direct myocardial injury. Troponin is used to assess acute cardiac ischemia, which is unrelated to carbamazepine’s pharmacologic profile. Cardiac monitoring is not part of standard long-term surveillance for this medication.
D. Monthly pregnancy testing is not routinely required for all women of childbearing age on Carbamazepine (Tegretol). Although carbamazepine is teratogenic and requires counseling on contraception and pregnancy risks, standardized frequent pregnancy testing is not universally mandated. Monitoring focuses more on ensuring effective contraception and preconception counseling rather than monthly testing.
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