In Neuroleptic malignant syndrome, cause of death is ?
**Core Concept**
Neuroleptic malignant syndrome (NMS) is a life-threatening neurological disorder associated with the use of antipsychotic medications. It is characterized by fever, altered mental status, muscle rigidity, autonomic instability, and changes in the level of consciousness. The pathophysiology of NMS involves an abnormal increase in dopamine release and a subsequent hypermetabolic state.
**Why the Correct Answer is Right**
The cause of death in NMS is primarily due to the severe hyperthermia that occurs, which can lead to rhabdomyolysis, acute kidney injury, and multi-organ failure. The hyperthermia is thought to be mediated by an abnormal increase in dopamine release, which stimulates the hypothalamus to produce excessive heat. This can be exacerbated by the patient's inability to regulate their body temperature due to the muscle rigidity and altered mental status associated with NMS.
**Why Each Wrong Option is Incorrect**
* **Option A:** While respiratory failure can occur in NMS, it is not the primary cause of death.
* **Option B:** Cardiac arrest can occur in NMS, but it is not the most common cause of death.
* **Option C:** While seizures can occur in NMS, they are not the primary cause of death.
**Clinical Pearl / High-Yield Fact**
Rhabdomyolysis and acute kidney injury are common complications of NMS, and early recognition and treatment are crucial to preventing these complications.
**Correct Answer: D. Severe hyperthermia leading to multi-organ failure.**