The doctor orders 250 mg of an antibiotic. The stock supply is a vial of 250 mg of the drug. Directions say to reconstitute with 1.7 mL of sterile water to yield 2 mL of the drug. How many milliliters will you give for the correct dose?
0.5 mL
250 mL
1.7 mL
2 mL
The Correct Answer is D
Given:
Ordered dose of antibiotic: 250 mg
Vial contains: 250 mg of antibiotic
Reconstitution volume: 1.7 mL of sterile water
Final volume after reconstitution: 2 mL
Step 1: Determine the concentration of the reconstituted solution:
Concentration (mg/mL) = Total amount of drug (mg) / Total volume (mL)
Concentration (mg/mL) = 250 mg / 2 mL
Concentration (mg/mL) = 125 mg/mL
Step 2: Calculate the volume to be administered:
Volume (mL) = Ordered dose (mg) / Concentration (mg/mL)
Volume (mL) = 250 mg / 125 mg/mL
Volume (mL) = 2 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A) Naloxone (Narcan):
Naloxone is the antidote for opioid overdose, not for digoxin toxicity. It works by reversing the effects of opioid drugs such as morphine, heroin, and oxycodone by binding to opioid receptors in the brain. While Naloxone is vital in opioid toxicity, it has no effect on the toxicity of digoxin.
B) Digoxin immune FAB (Digibind):
Digoxin immune FAB (Digibind) is the antidote for digoxin toxicity. It works by binding to the digoxin molecules in the bloodstream, thereby inactivating them and preventing them from exerting their toxic effects on the heart. This treatment is critical in cases of severe digoxin toxicity, particularly when the patient exhibits symptoms such as life-threatening arrhythmias, severe bradycardia, or altered mental status.
C) Vitamin K:
Vitamin K is the antidote for warfarin (Coumadin) toxicity, not digoxin toxicity. It promotes the synthesis of clotting factors in the liver and is used to reverse excessive anticoagulation in cases of bleeding due to warfarin. It has no effect on digoxin toxicity, which requires specific treatment with digoxin immune FAB.
D) Inamrinone (Inocor):
Inamrinone is an inotropic medication used to treat severe heart failure by improving heart contractility. However, it is not used as an antidote for digoxin toxicity. In fact, inamrinone and other inotropic agents may be used cautiously in patients with digoxin toxicity, as they could potentially exacerbate arrhythmias, a known complication of digoxin toxicity.
Correct Answer is C
Explanation
A) High protein diet:
While a healthy diet is essential for managing heart disease, a high-protein diet is not specifically recommended as a nonpharmacologic control for heart disease. A balanced diet that includes adequate protein, healthy fats, and low saturated fats, while being high in fruits, vegetables, and whole grains, is more beneficial for heart health.
B) Decrease exercise:
Decreasing exercise is not recommended for heart disease management. In fact, regular physical activity is a key aspect of preventing and managing heart disease. Moderate exercise, such as walking, swimming, or cycling, helps improve cardiovascular health by lowering blood pressure, improving cholesterol levels, and reducing stress.
C) Smoking cessation:
Smoking cessation is one of the most important nonpharmacologic strategies for managing heart disease. Smoking is a major risk factor for heart disease because it damages the blood vessels, increases blood pressure, and promotes the formation of blood clots. Quitting smoking can significantly reduce the risk of heart disease, improve circulation, and lower the risk of heart attack and stroke.
D) Increase water intake:
While staying hydrated is important for overall health, there is no specific evidence to suggest that increasing water intake directly controls heart disease. However, maintaining proper hydration supports kidney function and circulatory health, and can assist with managing blood pressure.
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