A nurse is caring for a patient who has developed neuroleptic malignant syndrome (NMS) after starting haloperidol therapy. Which nursing intervention should be the highest priority?

Immediate discontinuation of the antipsychotic is the highest priority to halt progression of neuroleptic malignant syndrome (NMS), a life-threatening emergency. Other interventions like fever reduction or monitoring are supportive but secondary.

Understanding Neuroleptic Malignant Syndrome (NMS)
Neuroleptic malignant syndrome is a rare but life-threatening idiosyncratic reaction to antipsychotic medications, most notably first-generation agents like haloperidol . The pathophysiology is linked to central dopamine receptor blockade, which leads to a cascade of severe clinical manifestations: hyperthermia, generalized skeletal muscle rigidity, autonomic instability, and altered mental status [2,3]. The muscle rigidity is a key driver of hyperthermia due to excessive heat production, and it can rapidly progress to rhabdomyolysis, as evidenced by extreme elevations in creatine phosphokinase (CPK) exceeding 20,000 U/L [1,3]. This syndrome is a medical emergency because the unchecked progression of these symptoms can lead to acute kidney injury, metabolic acidosis, and cardiovascular collapse .

Prioritizing the Nursing Intervention
In the NCLEX-RN framework, when managing a life-threatening adverse drug reaction, the highest priority intervention is always to remove the causative agent. The immediate discontinuation of the offending antipsychotic medication, in this case haloperidol, is the most critical first step to halt the progression of the syndrome . While supportive care is essential, it will be futile if the pathological trigger remains active. The systematic review of NMS management underscores that the cornerstone of treatment is the prompt withdrawal of the dopamine antagonist, which directly addresses the underlying etiology of the dopamine receptor blockade .

Analyzing the Incorrect Options
The other options represent important supportive measures, but they are secondary to removing the causative drug.
- Administering acetaminophen (Option 1) is ineffective for the hyperthermia of NMS. The fever is not driven by a change in the hypothalamic set point mediated by prostaglandins, which is the mechanism acetaminophen targets. Instead, the hyperthermia is a direct consequence of intense muscle rigidity and heat generation, making antipyretics an inappropriate and ineffective intervention.
- Applying cooling blankets (Option 2) is a critical external cooling measure to manage severe hyperthermia and prevent further end-organ damage. However, it is a supportive, not a definitive, treatment. The heat generation from sustained muscle rigidity will continue unabated unless the source of the problem—the medication—is stopped first.
- Monitoring vital signs every 15 minutes (Option 3) is a necessary action for detecting hemodynamic instability and autonomic dysfunction, which are hallmark features of NMS [2,3]. However, in the hierarchy of nursing actions, assessment, while crucial, never takes priority over an intervention that directly prevents further harm. The patient requires immediate action to stop the syndrome’s progression, not just observation of its effects.

The clinical course of NMS can be rapid and devastating, with patients deteriorating into stupor, rhabdomyolysis, and acute renal failure over a prolonged period, as highlighted in a case where symptoms evolved over 168 days of hospitalization . Therefore, recognizing that the immediate cessation of the dopamine-blocking agent is the definitive, life-saving priority is paramount. All other interventions, including aggressive cooling, fluid resuscitation, and intensive monitoring, follow this critical first step [2,3].