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Difficulty: HardEstablishing Priorities

During a surgical procedure under general anesthesia, the intraoperative monitor reveals a sudden, rapid rise in end-tidal carbon dioxide (ETCO2). Simultaneously, the client develops generalized muscle rigidity and unexpected severe sinus tachycardia. Recognizing a malignant hyperthermia crisis, in which order must the nurse execute or assist with the following collaborative interventions? Arrange the actions from highest priority (first) to lowest priority (last).

  1. 1Discontinue the administration of volatile inhaled anesthetics and succinylcholine.
  2. 2Hyperventilate the client with 100% oxygen at a high flow rate.
  3. 3Administer reconstituted intravenous dantrolene sodium.
  4. 4Initiate active surface cooling measures and infuse chilled intravenous fluids.
  5. 5Insert an indwelling urinary catheter to monitor hourly urine output.

Answer

The correct sequence prioritizes removing the causative agent first, followed by supporting airway/breathing, administering the definitive antidote, treating the hyperthermia symptomatically, and finally establishing monitoring for secondary complications.
In any acute emergency, the nursing process and prioritization frameworks dictate that removing the immediate life-threatening cause is paramount. For malignant hyperthermia, this means stopping the triggering anesthetics immediately. Following the ABC framework, the next priority is to support ventilation and oxygenation (Breathing) because the hypermetabolic state creates extreme oxygen demand and CO2 production. Once ventilation is supported, circulation and pharmacological reversal take precedence via the administration of dantrolene, the definitive antidote. Only after these immediate life-saving measures are taken should the team focus on symptom management (active cooling) and ongoing assessment for secondary complications (urinary catheterization for rhabdomyolysis).

Step-by-Step Solution

1
Discontinue the administration of volatile inhaled anesthetics and succinylcholine.
The causative pharmacologic triggers are removed from the client's system.
Halting the trigger is the absolute first step in malignant hyperthermia to stop the unregulated release of calcium from the sarcoplasmic reticulum.
2
Hyperventilate the client with 100% oxygen at a high flow rate.
Hypoxemia is prevented and excess carbon dioxide is rapidly eliminated.
The hypermetabolic state causes severe oxygen consumption and CO2 production; aggressive ventilation (Breathing) immediately follows securing the trigger.
3
Administer reconstituted intravenous dantrolene sodium.
Muscle relaxation occurs and the hypermetabolic crisis is pharmacologically reversed.
Dantrolene is the only specific antidote for malignant hyperthermia and must be given promptly after airway and breathing are managed.
4
Initiate active surface cooling measures and infuse chilled intravenous fluids.
The client's rapidly rising core body temperature is systematically lowered.
Hyperthermia is a severe but secondary symptom of the metabolic crisis; cooling measures prevent brain damage but follow ABCs and antidote administration.
5
Insert an indwelling urinary catheter to monitor hourly urine output.
Urine output and color (monitoring for myoglobinuria) are continuously assessed.
Assessing for complications such as acute kidney injury secondary to rhabdomyolysis is vital but represents a lower-acuity monitoring intervention compared to acute resuscitation.

Key Concept

Prioritization of care during a malignant hyperthermia crisis strictly follows immediate removal of the triggering agent, followed by the ABCs (Airway, Breathing, Circulation/Antidote).
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Establishing Priorities

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