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Difficulty: HardPharmacological and Parenteral Therapies

A nurse is caring for a client with a pulmonary embolism who is receiving a continuous intravenous (IV) infusion of unfractionated heparin through a single-lumen peripheral IV catheter. The healthcare provider prescribes a scheduled dose of IV gentamicin to be infused over 60 minutes60 \text{ minutes}. A pharmacological reference indicates that heparin and gentamicin are physically incompatible at the Y-site. Which action is most appropriate for the nurse to take?

  1. Insert a second peripheral intravenous catheter to administer the gentamicin infusion.Answer
  2. B
    Pause the heparin infusion, flush the catheter with normal saline, administer the gentamicin, and flush again before resuming the heparin.
  3. C
    Connect the gentamicin secondary tubing to the Y-site port furthest from the client to allow for adequate dilution in the primary tubing.
  4. D
    Contact the healthcare provider to request a prescription for a chemically compatible antibiotic to replace the gentamicin.

Answer

The most appropriate action is to insert a second peripheral intravenous catheter to administer the gentamicin infusion.
The correct action requires the nurse to synthesize two pieces of clinical data: the physical incompatibility of the medications and the pharmacokinetics of heparin. Because the drugs precipitate when mixed, they cannot share a line. Because heparin has a very short half-life (11 to 2 hours2 \text{ hours}) and is being used to treat an acute pulmonary embolism, the infusion cannot be paused for 60 minutes60 \text{ minutes} without the client losing therapeutic anticoagulation. Therefore, starting a second IV line is the only safe and appropriate action.

Step-by-Step Solution

1
Identify the chemical incompatibility between the continuous primary infusion (heparin) and the prescribed secondary infusion (gentamicin).
The nurse recognizes that the two medications cannot be administered through the same intravenous line simultaneously.
Mixing incompatible medications in the same IV line can cause precipitation, which may lead to catheter occlusion or a life-threatening embolism.
2
Evaluate the feasibility of pausing the primary infusion to administer the secondary medication.
The nurse determines that pausing the heparin infusion for 60 minutes60 \text{ minutes} is clinically contraindicated.
Unfractionated heparin has a very short half-life (11 to 2 hours2 \text{ hours}). Interrupting the infusion for an hour will rapidly cause subtherapeutic anticoagulation, placing the client at severe risk for thrombus extension.
3
Determine the safest independent nursing intervention to deliver both prescribed therapies.
The nurse establishes a second peripheral IV access site.
A second dedicated IV line allows both the critical continuous anticoagulant and the required antibiotic to infuse safely and on schedule.

Key Concept

Management of Intravenous Medication Incompatibilities and Continuous Critical Infusions
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Topics

Pharmacological and Parenteral Therapies

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