A young man with known history of heroine addiction is brought in the emergency in unconscious state by his friends. On examination his pupil are pin point. What will be the treatment of choice?
**Core Concept**
The patient's presentation of unconsciousness and pinpoint pupils is suggestive of opioid overdose, which is a life-threatening medical emergency. Opioids exert their effects by binding to opioid receptors in the brain and spinal cord, leading to depression of the central nervous system and respiratory function.
**Why the Correct Answer is Right**
The treatment of choice for opioid overdose is naloxone, a specific opioid antagonist that rapidly reverses the effects of opioids by competitively binding to opioid receptors. Naloxone is administered intravenously, intramuscularly, or intranasally, and its effects are typically seen within 2-3 minutes. Naloxone works by blocking the action of opioids at the mu, kappa, and delta opioid receptors, thereby reversing respiratory depression, sedation, and other opioid-related effects.
**Why Each Wrong Option is Incorrect**
* **Option A:** Nalbuphine is an opioid agonist-antagonist that can be used for pain management, but it is not the treatment of choice for opioid overdose.
* **Option B:** Fentanyl is a potent opioid agonist that can exacerbate opioid overdose, making it an inappropriate choice for treatment.
* **Option C:** Naltrexone is a long-acting opioid antagonist used for opioid dependence treatment, but it is not suitable for acute opioid overdose reversal.
**Clinical Pearl / High-Yield Fact**
In cases of suspected opioid overdose, always administer naloxone promptly, as every minute counts in preventing respiratory arrest and cardiac arrest.
**Correct Answer:** C. Naloxone.