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 C
Explanation
Choice A reason: Administering captopril risks angioedema, as the patient’s history of tongue and lip swelling with enalapril (another ACE inhibitor) suggests a class effect due to bradykinin accumulation. This is potentially life-threatening, requiring avoidance, not monitoring, making this choice unsafe and incorrect.
Choice B reason: Fosinopril, another ACE inhibitor, carries the same angioedema risk as captopril and enalapril due to similar bradykinin effects. Switching within the same drug class doesn’t address the patient’s history of adverse reactions, making this choice inappropriate and potentially dangerous.
Choice C reason: Holding captopril and notifying the provider is correct, as the patient’s history of angioedema with enalapril indicates a high risk with captopril, another ACE inhibitor. Alternative classes (e.g., ARBs) should be considered to avoid life-threatening reactions, making this the safest and correct action.
Choice D reason: Angioedema (tongue and lip swelling) is a serious, potentially fatal side effect of ACE inhibitors, not benign. Reassuring the patient minimizes the risk, which could delay intervention. The history warrants avoiding captopril and consulting the provider, making this choice incorrect and unsafe.
Correct Answer is B
Explanation
Choice A reason: Salt substitutes contain potassium, which risks hyperkalemia with spironolactone, a potassium-sparing diuretic. This is dangerous, so it’s incorrect for understanding.
Choice B reason: Spironolactone spares potassium, so stopping supplements prevents hyperkalemia, a serious risk. This shows correct understanding, making it the correct choice.
Choice C reason: Spironolactone reduces fluid, not causes overhydration. Monitoring for dehydration is more relevant, so this is incorrect for the medication’s effects.
Choice D reason: Spironolactone’s effects take days to weeks, not hours. Immediate improvement is unrealistic, so this is incorrect for proper patient understanding.
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