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Samantha Hudson a two-year-old child in the ER with parents at the bedside. She came in not feeling well, irritable, crying all night, and not eating or drinking. Orders: Vistaril 15 mg IM q4h, Stat x 1 for nausea.

Available: Vistaril 50 mg/ml

How many mL will you administer to Samantha now?

A.

1 mL

B.

0.5 mL

C.

0.3 mL

D.

0.2 mL

Answer and Explanation

The Correct Answer is C

Given:

Desired dose of Vistaril: 15 mg

Concentration of Vistaril: 50 mg/mL

 

Step 1: Set up the proportion:

Desired dose (mg) / Volume to administer (mL) = Concentration (mg/mL)

 

 

Step 2: Substitute the values:

15 mg / Volume = 50 mg/mL

 

Step 3: Solve for the unknown volume:

Volume = 15 mg / 50 mg/mL

 

Step 4: Calculate the volume:

Volume = 0.3 mL


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Related Questions

Correct Answer is B

Explanation

The concentration provided is 0.5 g/3 mL.

Convert grams to milligrams:

0.5g=500mg

Now, the concentration is 500 mg/3 mL.

Find the concentration in mg/mL:

Concentration=(500mg/3mL)≈166.67mg/mL

Next, to find the volume needed for a 10 mg dose, use the formula:

Volume=(Desireddose(mg)/Concentration(mg/mL)

10mg/166.67mg/mL≈0.06mL/dose

Correct Answer is A

Explanation

Given:

Volume of fluid: 2500 mL

Infusion time: 8 hours

Drop factor: 15 gtt/mL

Formula:

Flow rate (gtt/min) = (Volume (mL) / Time (hr)) x Drop factor (gtt/mL) / 60 min/hr

Step 1: Calculate the infusion rate in mL/hr:

Infusion rate (mL/hr) = Volume (mL) / Time (hr)

Infusion rate (mL/hr) = 2500 mL / 8 hr

Infusion rate (mL/hr) = 312.5 mL/hr

Step 2: Calculate the flow rate in gtt/min:

Flow rate (gtt/min) = (Infusion rate (mL/hr) x Drop factor (gtt/mL)) / 60 min/hr

Flow rate (gtt/min) = (312.5 mL/hr x 15 gtt/mL) / 60 min/hr

Flow rate (gtt/min) = 4687.5 gtt/hr / 60 min/hr

Flow rate (gtt/min) = 78.125 gtt/min

Step 3: Round to the nearest whole number:

Flow rate (gtt/min) ≈ 78 gtt/min

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