A nurse is preparing to administer digoxin at a dosage of 8 mcg/kg/day orally, divided equally every 12 hours, to a preschooler who weighs 33 lbs. Digoxin elixir is available at a concentration of 0.05 mg/mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["1.2"]
- Step 1: Identify the child's weight in pounds. The child weighs 33 lbs.
- Step 2: Convert the child's weight from pounds to kilograms. We know that 1 kg = 2.2 lbs. So, 33 lbs = 33 ÷ 2.2 kg. Calculating the division gives us approximately 15 kg.
- Step 3: Identify the prescribed dose in mcg/kg/day. The child is scheduled to receive 8 mcg/kg/day of digoxin, divided equally every 12 hours.
- Step 4: Calculate the total daily dose in mcg. We can do this by multiplying the child's weight in kg by the prescribed dose in mcg/kg:
- Total daily dose = 8 mcg/kg/day × 15 kg.
- Calculating the multiplication gives us: Total daily dose = 120 mcg/day.
- Step 5: Since the dose is divided equally every 12 hours, we divide the total daily dose by 2 to get the dose per administration:
- Dose per administration = Total daily dose ÷ 2.
- Dose per administration = 120 mcg ÷ 2.
- Calculating the division gives us: Dose per administration = 60 mcg.
- Step 6: Identify the concentration of the available solution. The available solution contains 0.05 mg/mL of digoxin. Convert this to mcg/mL for consistency with the dose per administration. We know that 1 mg = 1000 mcg. So, 0.05 mg = 0.05 × 1000 mcg = 50 mcg/mL.
- Step 7: Calculate the volume of solution needed to deliver the required dose. We can set up a proportion to solve for this:
- 50 mcg is to 1 mL as 60 mcg is to X mL.
- In other words, 50 mcg : 1 mL = 60 mcg : X mL.
- Step 8: Solve for X using cross-multiplication and division:
- Cross-multiplication gives us: 50 mcg × X mL = 60 mcg × 1 mL.
- Simplifying this gives us: 50X = 60.
- Dividing both sides by 50 gives us: X = 60 ÷ 50.
- Calculating the division gives us: X = 1.2.
Administer 1.2 mL of the digoxin elixir per dose.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Title: Choice A reason: Liver enzymes Liver enzymes are proteins that speed up chemical reactions in your body. They include alanine transaminase (ALT), aspartate transaminase (AST), and alkaline phosphatase (ALP). High levels of liver enzymes in the blood can indicate liver disease. However, rheumatic endocarditis is a heart condition, not a liver condition. Therefore, while liver enzymes are important for diagnosing liver conditions, they would not assist in confirming a diagnosis of rheumatic endocarditis.
Title: Choice B reason: Serum albumin Serum albumin is a type of protein that your liver and kidneys produce to help your body maintain fluid balance and function. Low or high albumin levels can indicate liver disease, kidney disease, or nutritional deficiency. However, rheumatic endocarditis is a heart condition, not a liver or kidney condition. Therefore, while serum albumin is important for diagnosing liver and kidney conditions, it would not assist in confirming a diagnosis of rheumatic endocarditis.
Title: Choice C reason: Throat culture A throat culture is a lab test used to find and identify germs in the back of your mouth that are making you sick. It can diagnose infections like strep throat, gonorrhea, thrush, diphtheria, and pertussis. Rheumatic endocarditis is often caused by a streptococcal infection, which can be identified through a throat culture. Therefore, a throat culture would assist in confirming a diagnosis of rheumatic endocarditis.
Title: Choice D reason: Arterial blood gases An arterial blood gas (ABG) test measures the levels of oxygen and carbon dioxide in your blood as well as the pH balance in your blood. It helps diagnose and monitor conditions that affect your respiratory, circulatory, and metabolic systems. However, rheumatic endocarditis is a heart condition that is often caused by a bacterial infection. Therefore, while an ABG test is important for diagnosing conditions that affect your respiratory, circulatory, and metabolic systems, it would not assist in confirming a diagnosis of rheumatic endocarditis.
Correct Answer is D
Explanation
Choice A reason:Atrial fibrillation is not typically treated with defibrillation; it is usually managed with medication or other forms of rhythm control.
Choice B reason:Supraventricular tachycardia does not usually require defibrillation; it may be treated with vagal maneuvers or medication.
Choice C reason:Asystole, or the absence of a heartbeat, is not treated with defibrillation as there is no electrical activity to reset.
Choice D reason:Ventricular fibrillation is a life-threatening heart rhythm that requires immediate defibrillation to restore a normal heart rhythm.
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