The provider has ordered 180 mg of Dilantin PO every 8 hours. The label of the drug reads 250 mg per 5 ml. How many milliliters will the nurse administer per dose?
3.6 ml
4.5 ml
5 ml
7 ml
The Correct Answer is A
Choice A reason: To calculate the dose, divide the ordered 180 mg by the concentration of 250 mg per 5 ml: (180 mg ÷ 250 mg) × 5 ml = 0.72 × 5 = 3.6 ml. This precise calculation ensures the correct amount of Dilantin is administered, matching the provider’s order.
Choice B reason: A 4.5 ml dose would deliver 225 mg (4.5 ml × 250 mg/5 ml), exceeding the ordered 180 mg. This overdose could increase the risk of toxicity, as Dilantin has a narrow therapeutic range, making this an incorrect choice.
Choice C reason: A 5 ml dose delivers 250 mg (5 ml × 250 mg/5 ml), significantly more than the ordered 180 mg. This excessive dose could lead to adverse effects like ataxia or nystagmus, rendering this choice incorrect for the prescribed amount.
Choice D reason: A 7 ml dose would provide 350 mg (7 ml × 250 mg/5 ml), far exceeding the ordered 180 mg. Such a high dose could cause severe toxicity, including neurological symptoms, making this an inappropriate and unsafe choice.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A reason: A complete physical exam is comprehensive but not specific to initial nutritional screening. Height and weight history provide BMI, a quick nutritional indicator, so this is not the first assessment.
Choice B reason: Height and weight history are critical for initial nutritional screening, enabling BMI calculation to assess undernutrition or obesity. This is a standard, quick method, making it the correct first step.
Choice C reason: Calorie counting is detailed and time-consuming, unsuitable for initial screening. Height and weight offer a rapid baseline for nutritional status, so this is incorrect for the first step.
Choice D reason: Leg circumference may assess muscle mass but is not standard for initial nutritional screening. Height and weight are primary for BMI, so this is incorrect for the initial assessment.
Correct Answer is B
Explanation
Choice A reason: Dorsiflexion and toe fanning indicate a Babinski sign, a reflex test, not Romberg’s sign. Romberg’s sign involves balance issues with closed eyes, so this is incorrect for the neurological assessment.
Choice B reason: A positive Romberg’s sign is observed when a patient sways significantly or loses balance when standing with feet together and eyes closed, indicating impaired proprioception or cerebellar function. This is the correct observation for the test.
Choice C reason: Rhythmic eye twitching (nystagmus) is unrelated to Romberg’s test, which assesses balance. Swaying with closed eyes defines a positive Romberg’s, sign, so this is incorrect for the outcome.
Choice D reason: Inability to point fingers to a reference tests coordination, not the Romberg’s test, which focuses on balance with eyes closed. Significant swaying is the correct sign, so this is incorrect.
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