The healthcare provider orders Lasix 40 mg IV now. The concentration available is Lasix 20 mg/mL. How many mL will the patient receive?
5 mL
6 mL
4 mL
2 mL
The Correct Answer is D
Choice A reason: To calculate volume, divide the ordered dose (40 mg) by the concentration (20 mg/mL): 40 ÷ 20 = 2 mL. Choice A (5 mL) delivers 100 mg (5 × 20), far exceeding the ordered dose, risking fluid and electrolyte imbalances, making it incorrect for safe administration.
Choice B reason: The correct volume is 40 mg ÷ 20 mg/mL = 2 mL. Choice B (6 mL) delivers 120 mg (6 × 20), significantly overdosing Lasix, which could cause severe dehydration, hypokalemia, or hypotension. This excessive dose is unsafe and incorrect for the prescribed administration.
Choice C reason: Calculating 40 mg ÷ 20 mg/mL yields 2 mL. Choice C (4 mL) delivers 80 mg (4 × 20), doubling the ordered dose. This could lead to excessive diuresis, electrolyte disturbances, or hypotension, making it an incorrect and potentially harmful choice for administration.
Choice D reason: Dividing the ordered dose (40 mg) by the concentration (20 mg/mL) gives 40 ÷ 20 = 2 mL. This volume accurately delivers the prescribed 40 mg of Lasix, ensuring effective diuresis for conditions like edema or heart failure while minimizing risks, making it the correct choice.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A reason: Furosemide, a loop diuretic, reduces blood volume, often lowering blood pressure. Monitoring for hypotension is critical to prevent dizziness or shock, making this the correct manifestation to observe.
Choice B reason: Decreased temperature is not a common effect of furosemide, which primarily affects fluid balance. Blood pressure changes are more relevant, so this is incorrect.
Choice C reason: Furosemide may increase heart rate due to volume loss, not decrease pulse. Hypotension is a primary concern, making this incorrect for the expected manifestation.
Choice D reason: Decreased respiratory rate is unrelated to furosemide, which may improve breathing in heart failure but not slow respiration. Blood pressure is key, so this is incorrect.
Correct Answer is A
Explanation
Choice A reason: Inhaled glucocorticoids are used daily in COPD to reduce inflammation and prevent exacerbations. This shows correct understanding, making it the correct choice.
Choice B reason: Glucocorticoids are for daily maintenance, not as-needed use, which is for beta2-agonists. This misunderstanding is incorrect for the medication regimen.
Choice C reason: Beta2-agonists are used as needed for symptom relief, not daily, in stable COPD. This is incorrect, as daily use is for maintenance drugs.
Choice D reason: Beta2-agonists relax airways, not suppress inflammation; that’s the glucocorticoid’s role. This incorrect mechanism shows misunderstanding, so it’s incorrect.
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