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Difficulty: HardPharmacological and Parenteral Therapies

A client in the cardiac intensive care unit requires a continuous intravenous infusion of dobutamine at 10 \mug/kg/min10\text{ \mu g/kg/min} for severe ventricular dysfunction. The client currently has only one functioning peripheral venous access site. After assessing new-onset bilateral crackles and an oxygen saturation of 88%88\%, the healthcare provider prescribes an immediate 80 mg80\text{ mg} intravenous bolus of furosemide. Which of the following actions is the safest and most appropriate method to administer the prescribed diuretic?

  1. Establish a second peripheral intravenous access site and administer the diuretic steadily over 4 minutes.Answer
  2. B
    Pause the continuous infusion, flush the line with 0.9%0.9\% sodium chloride, administer the bolus, and promptly resume the continuous infusion.
  3. C
    Connect the medication syringe to the lowest Y-site port and administer it concurrently with the active continuous infusion.
  4. D
    Administer the bolus via rapid intravenous push over 1 minute through a newly inserted dedicated line to quickly alleviate the respiratory distress.

Answer

The safest action is to establish a second peripheral IV site and administer the furosemide slowly over 4 minutes.
The correct action addresses three critical pharmacology and safety principles simultaneously: dobutamine cannot be paused due to its short half-life and the risk of hemodynamic collapse, furosemide is highly incompatible with dobutamine and will precipitate if mixed, and a high dose of furosemide (80 mg80\text{ mg}) must be pushed slowly over at least 4 minutes (maximum 20 mg/minute20\text{ mg/minute}) to prevent permanent ototoxicity. Establishing a second line is the only action that fulfills all of these safety requirements.

Step-by-Step Solution

1
Analyze the physical compatibility of the two medications.
Furosemide and dobutamine are physically incompatible and will immediately precipitate if mixed in the same IV tubing.
Administering incompatible medications together can cause catheter occlusion and life-threatening emboli, requiring separation of the medications.
2
Determine the pharmacokinetics of the continuous vasoactive infusion.
Dobutamine has an extremely short half-life of approximately 2 minutes.
Pausing the dobutamine infusion for a flush-push-flush sequence would cause a rapid, dangerous drop in cardiac output and systemic perfusion.
3
Calculate the safe administration rate for the intravenous bolus of furosemide.
The maximum safe rate for intravenous furosemide is 20 mg/minute20\text{ mg/minute}. An 80 mg80\text{ mg} dose must be administered over at least 4 minutes.
Rapid administration of high-dose loop diuretics significantly increases the risk of permanent ototoxicity.
4
Synthesize the findings to determine the priority nursing action.
Because the medications cannot be mixed, the continuous infusion cannot be safely paused, and the diuretic must be pushed slowly, a second IV line is absolutely necessary.
Establishing a second line ensures that the client receives the critical diuretic at the safe rate without interrupting life-sustaining cardiac support.

Key Concept

Parenteral therapy safety requires simultaneous evaluation of drug compatibility, safe administration rates, and the hemodynamic consequences of interrupting continuous vasoactive infusions.
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Topics

Pharmacological and Parenteral Therapies

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