A nurse is mixing a short-acting insulin and an intermediate-acting insulin in the same syringe for a client who has diabetes mellitus.

Which of the following actions should the nurse take first?

Draw the intermediate-acting insulin into the syringe.

Draw the short-acting insulin into the syringe.

Inject air into the intermediate-acting insulin vial.

Inject air into the short-acting insulin vial.

Answer and Explanation

The Correct Answer is C

A. When mixing insulins, you should draw the short-acting insulin into the syringe first. This is done after injecting air into both vials (first into intermediate-acting, then into short-acting). Drawing intermediate-acting insulin first can contaminate the short-acting insulin vial with the longer-acting solution, which could alter the effectiveness of future doses.

B. Although this step is required when mixing insulins, it is not the first step. The nurse should first inject air into both vials to maintain vial pressure.

C. The nurse should inject air into the intermediate-acting insulin vial first because it helps prevent contamination and maintains the correct pressure within the vial. Intermediate-acting insulin, typically NPH (Neutral Protamine Hagedorn), is cloudy, and air injection into the vial allows for easy withdrawal later on without disrupting the order of mixing.

D. Injecting air into the short-acting insulin vial is necessary but should be done after injecting air into the intermediate-acting vial. By injecting air into both vials first, the nurse prevents a vacuum effect, which can make it difficult to draw up the insulin. After injecting air, the nurse can draw the short-acting insulin into the syringe before moving to the intermediate-acting insulin. This order minimizes the risk of contamination.

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Correct Answer is C

Explanation

A.When mixing insulins, you should draw the short-acting insulin into the syringe first. This is done after injecting air into both vials (first into intermediate-acting, then into short-acting). Drawing intermediate-acting insulin first can contaminate the short-acting insulin vial with the longer-acting solution, which could alter the effectiveness of future doses.

B.Although this step is required when mixing insulins, it is not the first step. The nurse should first inject air into both vials to maintain vial pressure.

C.The nurse should inject air into the intermediate-acting insulin vial first because it helps prevent contamination and maintains the correct pressure within the vial. Intermediate-acting insulin, typically NPH (Neutral Protamine Hagedorn), is cloudy, and air injection into the vial allows for easy withdrawal later on without disrupting the order of mixing.

D.Injecting air into the short-acting insulin vial is necessary but should be done after injecting air into the intermediate-acting vial. By injecting air into both vials first, the nurse prevents a vacuum effect, which can make it difficult to draw up the insulin. After injecting air, the nurse can draw the short-acting insulin into the syringe before moving to the intermediate-acting insulin. This order minimizes the risk of contamination.

A. Change the tubing set every 72 hr. B. Aspirate residual volume every 4 hr. C. Flush the tubing with 10 mL of water every 2 hr. D. Heat the formula to 40.5° C (105° F).

Correct Answer is B

Explanation

A. Change the tubing set every 72 hr:Continuous enteral feeding tubing sets should generally be changed every 24 hours to reduce the risk of bacterial contamination. Changing every 72 hours is too long and increases infection risk.

B. Aspirate residual volume every 4 hr:Aspiration of residual volume every 4 hours is standard practice when providing continuous enteral feedings. This ensures the client is tolerating the feedings and helps prevent aspiration or overfeeding. Large residual volumes may indicate poor gastric emptying.

C. Flush the tubing with 10 mL of water every 2 hr:The tubing should be flushed with 30 mL of water every 4-6 hours (depending on protocol), not just 10 mL, to maintain tube patency and prevent clogging.

D. Heat the formula to 40.5° C (105° F):Formula should not be heated to such a high temperature. It should be administered at room temperature to avoid discomfort and potential damage to the gastrointestinal tract.

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A nurse is mixing a short-acting insulin and an intermediate-acting insulin in the same syringe for a client who has diabetes mellitus. Which of the following actions should the nurse take first?

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