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Difficulty: MediumPharmacological and Parenteral Therapies

A client is admitted to the medical-surgical unit with infective endocarditis. The client's vital signs include a temperature of 102.4°F (39.1°C), heart rate of 112 bpm, and blood pressure of 108/64 mmHg. The healthcare provider prescribes intermittent intravenous (IV) infusions of penicillin G and gentamicin. The client currently has a single 20-gauge peripheral IV line established. Which action by the nurse represents the safest administration technique for these medications?

  1. Administer the penicillin G, flush the IV line thoroughly with 0.9% sodium chloride, and then infuse the gentamicin.Answer
  2. B
    Connect the gentamicin as a secondary infusion to the Y-site of the penicillin G tubing for simultaneous delivery.
  3. C
    Combine both the penicillin G and gentamicin into a single IV bag of 0.9% sodium chloride to reduce the number of infusions.
  4. D
    Delay the antibiotic administration and contact the healthcare provider to request placement of a second peripheral IV line.

Answer

The nurse should administer the medications sequentially, flushing the IV line thoroughly with 0.9% sodium chloride between the penicillin G and gentamicin infusions.
The correct action is to administer the antibiotics sequentially and flush the IV line between them. Penicillins and aminoglycosides (like gentamicin) act synergistically in the body to treat severe infections such as endocarditis. However, they are chemically incompatible in vitro (outside the body). If mixed in the same IV bag or tubing, the penicillin will directly inactivate the aminoglycoside. Flushing the line completely with normal saline between the infusions ensures that the medications do not mix, allowing for safe and effective delivery of both drugs.

Step-by-Step Solution

1
Identify the classification and specific compatibility of the prescribed medications.
The nurse recognizes that penicillin G (a penicillin) and gentamicin (an aminoglycoside) are chemically incompatible in vitro.
Penicillins can physically inactivate aminoglycosides if they come into direct contact in IV tubing or a solution bag.
2
Determine the safest administration strategy given the client's current IV access.
The client has a single peripheral IV line. Since both infusions are prescribed intermittently (rather than as continuous life-sustaining drips), they can be administered one after the other.
Sequential administration avoids the need for an unnecessary second IV stick while ensuring timely antibiotic delivery.
3
Apply the standard nursing procedure for administering incompatible medications through a single line.
The nurse infuses the first medication, flushes the line completely with a neutral, compatible solution (like normal saline), and then infuses the second medication.
Flushing clears the tubing of the first drug, preventing in-vitro mixing and ensuring both medications retain their therapeutic efficacy when they enter the bloodstream.

Key Concept

Parenteral therapy compatibility and safe sequential administration of incompatible antibiotics.
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Topics

Pharmacological and Parenteral Therapies

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