Reconstitution Problems PDF

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Reconstitution Problems Sample:

5. Ampicillin 350 mg IM is ordered daily. After reconstitution with 3.5 mL of sterile water, the vial contains a total of 500 mg/mL (This is the concentration). The nurse will then administer _______ mL to the patient. Note that unless other wise specified the answer is intended per dose as opposed to a question that may asked for the amount given over a 24 hour period.

In the past, students have demonstrated some difficulty understanding this type of problem. This handout is intended to provide a general overview, but is NOT intended to replace the explanation and practice problems in Chapter 19 of your Text (Calculation with Confidence, 6th ed). Some medications are in the form of a powder and must be diluted with a specified liquid (such as sterile water) in order to make it usable for the parenteral (Injection or IV) method of delivery to the patient. This is referred to as “reconstitution) – ie creating a liquid solution from a powder. The nurse must add the correct amount of diluent (fluid) in order for the powder to become a liquid. (Think of mixing Kool-ade. You must read the directions on the label to see how much water to add to make the finished liquid drink product ) In this case, the label of the medication will give specific directions for how much and what type of liquid to add, Once added, the label will give the concentration of the medication. In these problems, the calculation is determined using the same methods ie ratio and proportion, formula or dimensional analysis as in other problems. Confusion sometimes occurs with students not understanding what to do with the dilution numbers (i.e. “After reconstitution of 3.5 mL of sterile water the vial contains a total of 500 mg / mL” of sterile water to create a concentration of 500 mg / cc’s. The information that is needed to work the problem is: the ordered amount: 350 mg and the concentration after reconstituting: 500 mg / mL. ( Note the nurse must add the 3.5 ml of sterile water, but that number is NOT needed in the calculation of the amount to give to the patient.. What IS needed is the fact that once the 3.5 mL of sterile water is added, the concentration is 500 mg / ml. Hence to work the problem above: Ordered: 350 mg On Hand (label) – 500 mg / ml 350mg : x :: 500 mg / 1 ml

500 mg X = 350 mg mL 350 / 500 X = 0.7 mL , thus the nurse will administer 0.7 ml of the reconstituted medication.

Landson: 2014

Landson: 2014...