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Difficulty: Very hardPharmacological and Parenteral Therapies

A client who recently underwent a mechanical aortic valve replacement is receiving a continuous intravenous infusion of unfractionated heparin via a single-lumen peripherally inserted central catheter (PICC). The client is diagnosed with a healthcare-associated systemic infection, and the healthcare provider prescribes an intermittent intravenous infusion of vancomycin 1,000 mg1,000\text{ mg} to run over 9090 minutes. The nurse notes from the pharmacological reference that heparin and vancomycin are physically incompatible at the Y-site. What is the priority nursing action to safely administer the prescribed vancomycin?

  1. A
    Pause the heparin infusion, flush the PICC with 10 mL10\text{ mL} of 0.9%0.9\% sodium chloride, administer the vancomycin, flush again, and resume the heparin.
  2. Establish an additional peripheral intravenous access site to administer the vancomycin infusion independently.Answer
  3. C
    Connect the vancomycin secondary tubing to the lowest Y-site on the PICC line and infuse both medications concurrently.
  4. D
    Recalculate the vancomycin infusion rate to administer the entire dose over 1515 minutes while temporarily holding the heparin.

Answer

The nurse must establish a new peripheral intravenous access site to administer the vancomycin, ensuring the continuous heparin infusion remains completely uninterrupted.
For a client with a mechanical heart valve, continuous heparin therapy is an absolute priority to prevent fatal valve thrombosis. Pausing this critical infusion for the 9090 minutes required to safely administer vancomycin would dangerously lower the client's anticoagulation levels. Because the two medications are physically incompatible and cannot share a single intravenous line, the only safe and effective solution is to establish a second independent intravenous access site. This ensures both the antibiotic and the anticoagulant are delivered continuously and without risk of precipitation.

Step-by-Step Solution

1
Identify the pharmacological incompatibility between the continuous unfractionated heparin and the prescribed vancomycin.
Determines that the two medications cannot physically mix in the same intravenous tubing or Y-site without causing dangerous crystallization.
Mixing physically incompatible medications poses a high risk of catheter occlusion and life-threatening systemic emboli.
2
Evaluate the clinical indication and critical nature of the primary continuous heparin infusion.
Recognizes that the client possesses a mechanical aortic valve, which mandates strict, uninterrupted anticoagulation therapy.
A 90-minute pause in heparin administration would drastically drop the activated partial thromboplastin time (aPTT) below the therapeutic range, exposing the client to acute mechanical valve thrombosis.
3
Determine the safest administration route that accommodates both the physical incompatibility and the physiological requirements of the client.
Decides to initiate a separate peripheral intravenous catheter exclusively for the vancomycin infusion.
This strategy allows both essential therapies to proceed safely, avoiding physical admixture in the tubing and preventing any dangerous interruption in the client's anticoagulation.

Key Concept

Management of intravenous incompatibilities concurrent with critical continuous infusions
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Topics

Pharmacological and Parenteral Therapies

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