A patient needs an IM injection into the dorsogluteal muscle.
Which gauge and length of needle should the nurse choose for this injection?
21 gauge, 1.5 in. length
22 gauge, 0.5 in. length
18 gauge, 1 in. length
25 gauge, 2 in. length
The Correct Answer is A
For an intramuscular (IM) injection into the dorsogluteal muscle, a common choice for needle gauge and length is:
21 gauge, 1.5 in. length
Here's the rationale:
Gauge (Thickness of the needle):
A lower gauge number indicates a thicker needle. 21 gauge is a common choice for IM injections because it is thick enough to allow the medication to flow easily, yet not so thick that it causes excessive pain or tissue damage.
Length:
1.5 inches (or 38 mm) is an appropriate length for an IM injection, especially in the dorsogluteal muscle, which usually has sufficient tissue depth to accommodate this length of the needle. It ensures that the medication is delivered deep into the muscle tissue.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
To provide the appropriate dose of 5 mL of 10% dextrose using a vial of 5 mL 50% dextrose, you need to dilute the concentrated solution to the desired concentration.
The correct method is:
Dextrose 50%, add 3 mL to 2 mL injectable saline
Here's the explanation:
1. Dextrose concentration in 5 mL of 50% dextrose:
5 mL * 50% = 2.5 mL of pure dextrose (2500 mg)
2. To prepare 5 mL of 10% dextrose:
- You need 5 mL of the final solution, and you already have 2.5 mL of pure dextrose from the 50% solution.
- You need to dilute the remaining 2.5 mL of 50% dextrose with injectable saline.
- Calculate the volume of 50% dextrose to add: (5 mL - 2.5 mL = 2.5 mL)
3. Dilution with injectable saline:
- You have 2.5 mL of 50% dextrose and need to add 2.5 mL of injectable saline.
- Mixing 2.5 mL of 50% dextrose with 2.5 mL of injectable saline gives a total volume of 5 mL.
- The resulting solution contains 2.5 mL of 50% dextrose and 2.5 mL of saline, making it 10% dextrose.
Therefore, the nurse should use Dextrose 50%, add 3 mL to 2 mL injectable saline to provide the appropriate dose of 5 mL of 10% dextrose.
Correct Answer is B
Explanation
To calculate the infusion rate in mL/hr, you first need to find the total dosage the patient needs per minute and then convert it to mL/hr.
Convert the patient's weight from pounds to kilograms: 110 lb ÷ 2.2 = 50 kg
Calculate the total dosage per minute:
Dosage = 200 micrograms/kg/minute * 50 kg = 10,000 micrograms/minute or 10 mg/minute
Calculate the total volume per minute:
Concentration of esmolol solution = 2.5 grams in 250 mL = 10 mg/mL Volume = Dosage ÷ Concentration = 10 mg/minute ÷ 10 mg/mL = 1 mL/minute
Convert the volume per minute to mL/hr: 1 mL/minute × 60 minutes/hour = 60 mL/hour
So, the nurse should program the IV pump to deliver 60 mL/hr.
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