The physician orders Zithromax 500 mg IVPB every 24 hours.
The medication is supplied in 500 mg/250 mL to infuse over 90 minutes.
Calculate the flow rate in milliliters per hour.
(ROUND TO WHOLE NUMBER: LABEL CORRECTLY TO RECEIVE CREDIT)
The Correct Answer is ["167"]
Step 1 is: Calculate the flow rate in mL per hour. (500 mg ÷ 500 mg) × 250 mL = 250 mL. (250 mL ÷ 90 min) × 60 min = 166.666. mL/hr. Rounded to the whole number, the flow rate is 167 mL/hr.
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Related Questions
Correct Answer is D
Explanation
Choice A rationale
A 25-gauge 1/2-inch needle with an insulin syringe is typically used for subcutaneous injections, especially for insulin administration. Insulin syringes are calibrated in units, which is not appropriate for general medication administration requiring volume measurement for intradermal injections.
Choice B rationale
A 23-gauge 1-inch needle with a 3 mL syringe is commonly used for intramuscular injections. The 23-gauge needle is too large and the 1-inch length is too long for the superficial nature of an intradermal injection, which only penetrates the epidermis and a small portion of the dermis.
Choice C rationale
A 21-gauge 1 1/2-inch needle with a 5 mL syringe is typically used for intramuscular injections, especially for viscous medications or larger muscle masses. The needle gauge is too large and the length is excessive for an intradermal injection, which requires a very short, fine needle.
Choice D rationale
A 25-gauge to 27-gauge needle and a 3/8-inch to 5/8-inch length are appropriate for intradermal injections because they are very fine and short, allowing for precise placement within the dermis to create a wheal. Tuberculin syringes are calibrated in hundredths of a milliliter, allowing for accurate measurement of the small volumes (0.01-0.1 mL) typically administered intradermally.
Correct Answer is ["100"]
Explanation
Step 1 is calculate the flow rate in mL/hr. 100 mL ÷ 60 minutes = 1.666 mL/minute. 1.666 mL/minute × 60 minutes/hr = 99.96 mL/hr. Rounded to whole number: 100 mL/hr.
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