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Difficulty: HardPharmacological and Parenteral Therapies

A 65-year-old client with severe heart failure has a single peripheral venous catheter in the left forearm. A milrinone drip is currently infusing through this line to maintain cardiac output. Due to increasing respiratory distress from pulmonary edema, the healthcare provider orders a stat dose of furosemide 40 mg to be given by IV push. The drug reference manual indicates that furosemide and milrinone will form a precipitate if mixed. Which action represents the safest method to deliver the prescribed diuretic?

  1. Establish a new peripheral venous access site to administer the furosemide.Answer
  2. B
    Pause the milrinone, flush the existing line with 0.9% sodium chloride, push the furosemide, and flush again before restarting.
  3. C
    Connect the furosemide as a secondary infusion to the primary milrinone tubing using the port closest to the client.
  4. D
    Withdraw the furosemide into a syringe with 10 mL of sterile water and administer it concurrently through the same line.

Answer

The safest method is to establish a new peripheral venous access site to administer the furosemide.
Establishing a new IV line is the correct action because it addresses two critical safety priorities: it prevents chemical precipitation between incompatible medications, and it ensures that the life-sustaining continuous milrinone infusion is not interrupted. Milrinone has a short half-life, and abruptly stopping it to flush the line could cause an acute drop in cardiac output and severe hemodynamic instability in a client with heart failure.

Step-by-Step Solution

1
Identify the chemical incompatibility between furosemide and milrinone.
The medications cannot be mixed or run concurrently in the same line without forming a precipitate.
Precipitation can occlude the IV catheter and cause a potentially fatal embolus.
2
Evaluate the feasibility of the 'stop, flush, administer, flush' method.
Determine that this method is contraindicated.
Milrinone is a continuous vasoactive infusion necessary to maintain cardiac output; pausing it can lead to acute hemodynamic instability.
3
Determine the only remaining safe intervention.
A second, independent IV access must be established.
This allows the continuous inotrope to run uninterrupted while safely delivering the urgent diuretic without risk of precipitation.

Key Concept

Management of incompatible intravenous medications involving critical continuous vasoactive infusions.
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Topics

Pharmacological and Parenteral Therapies

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