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Difficulty: HardPharmacological and Parenteral Therapies

A client in the intensive care unit with septic shock is receiving a continuous intravenous infusion of norepinephrine via the proximal lumen of a triple-lumen central venous catheter. The healthcare provider prescribes a stat dose of intravenous sodium bicarbonate to treat severe metabolic acidosis. Upon checking a drug reference guide, the nurse discovers that norepinephrine and sodium bicarbonate are chemically incompatible. Which action by the nurse is the most appropriate?

  1. Administer the sodium bicarbonate dose through the medial or distal lumen of the existing central venous catheter.Answer
  2. B
    Pause the norepinephrine infusion briefly, flush the proximal lumen with normal saline, administer the sodium bicarbonate, and flush again before resuming.
  3. C
    Establish a new peripheral intravenous access site specifically for the administration of the sodium bicarbonate.
  4. D
    Dilute the sodium bicarbonate in a bag of normal saline and piggyback it into the continuous norepinephrine infusion line.

Answer

Administer the sodium bicarbonate dose through the medial or distal lumen of the existing central venous catheter.
The correct action is to use an alternative lumen on the existing multi-lumen central venous catheter. Multi-lumen catheters contain separate internal tubes that exit at different staggered points (proximal, medial, distal) along the catheter tip. Because these drugs do not mix within the catheter itself and are immediately dispersed by the high-volume blood flow of the superior vena cava upon exiting, it is entirely safe and standard practice to administer chemically incompatible medications through different lumens of the same central line.

Step-by-Step Solution

1
Analyze the client's current condition and the prescribed therapies.
The client is hemodynamically unstable, requiring a continuous norepinephrine infusion (vasopressor) for septic shock, and has severe metabolic acidosis requiring a stat dose of sodium bicarbonate.
Understanding the critical nature of both infusions establishes the priority of care.
2
Evaluate the compatibility issue identified by the drug reference guide.
Norepinephrine and sodium bicarbonate are incompatible; mixing them in the same tubing will deactivate the norepinephrine.
Chemical incompatibility dictates that these drugs cannot share the same intravenous pathway.
3
Assess the capabilities of the existing intravenous access.
The client has a triple-lumen central venous catheter. Only the proximal lumen is currently being used for norepinephrine.
Multi-lumen central venous catheters are specifically designed to allow simultaneous administration of incompatible drugs.
4
Determine the safest and most efficient administration route for the new medication.
Using a separate, available lumen on the central venous catheter allows immediate administration of the stat medication without interrupting the critical vasopressor infusion or risking drug interaction.
Separate lumens keep the drugs completely isolated until they exit into the high-volume, rapid-flow environment of the superior vena cava.

Key Concept

Central Venous Catheter Multi-Lumen Management and IV Compatibility
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Topics

Pharmacological and Parenteral Therapies

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