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Difficulty: Very hardPharmacological and Parenteral Therapies

A client is in the post-anesthesia care unit (PACU) following an open abdominal surgery under general anesthesia utilizing desflurane and succinylcholine. The nurse notes new-onset masseter muscle rigidity, tachycardia of 145 beats/minute145 \text{ beats/minute}, tachypnea, and an end-tidal carbon dioxide (EtCO2EtCO_2) level of 65 mm Hg65 \text{ mm Hg}. The client's temperature is rapidly rising. Based on these findings, which of the following pharmacological and parenteral interventions should the nurse anticipate implementing? (Select all that apply)

  1. A
    Reconstitute intravenous dantrolene sodium using sterile water containing a bacteriostatic preservative.
  2. Hyperventilate the client with 100%100\% oxygen using a bag-valve-mask or through the endotracheal tube.Answer
  3. C
    Administer intravenous diltiazem to manage the client's sustained tachycardia.
  4. Initiate a rapid intravenous infusion of chilled 0.9%0.9\% sodium chloride.Answer
  5. Administer intravenous regular insulin concurrent with 50%50\% dextrose.Answer
  6. F
    Administer a subsequent dose of intravenous succinylcholine to overcome the masseter muscle rigidity.

Answer

The nurse should hyperventilate the client with 100% oxygen, initiate a rapid intravenous infusion of chilled 0.9% sodium chloride, and administer intravenous regular insulin concurrent with 50% dextrose.
Malignant hyperthermia is a severe hypermetabolic state. The correct interventions address the critical pathophysiological changes: 100%100\% oxygen flushes out the massive amounts of carbon dioxide produced; chilled intravenous normal saline provides active core cooling; and the combination of regular insulin and 50%50\% dextrose drives extracellular potassium back into the cells, treating the life-threatening hyperkalemia caused by continuous muscle rigidity and breakdown.

Step-by-Step Solution

1
Identify the clinical emergency based on the assessment findings.
The combination of exposure to desflurane and succinylcholine, new-onset masseter muscle rigidity, tachycardia, hypercarbia (EtCO2EtCO_2 65 mm Hg65 \text{ mm Hg}), and rapidly rising temperature indicates malignant hyperthermia.
Early recognition of malignant hyperthermia is essential to prevent irreversible cardiovascular collapse and death.
2
Determine the priority respiratory intervention.
Hyperventilate the client with 100%100\% oxygen.
The hypermetabolic state produces massive amounts of carbon dioxide and depletes oxygen stores, requiring immediate enhanced ventilation.
3
Determine the priority parenteral cooling intervention.
Initiate rapid intravenous infusion of chilled 0.9%0.9\% sodium chloride.
Core body temperature can rise rapidly in malignant hyperthermia, necessitating immediate active core cooling to prevent cellular death.
4
Determine the priority pharmacological intervention for the metabolic complications.
Administer intravenous regular insulin and 50%50\% dextrose.
Sustained muscle rigidity causes rhabdomyolysis and severe hyperkalemia. Insulin drives potassium back into the cells, preventing lethal cardiac arrhythmias.

Key Concept

Malignant hyperthermia is a life-threatening pharmacogenetic hypermetabolic crisis triggered by volatile anesthetics and succinylcholine, requiring immediate discontinuation of triggers, administration of dantrolene, oxygenation, active cooling, and management of hyperkalemia.
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Topics

Pharmacological and Parenteral Therapies

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