Bupivacaine poisoning is treated with :
**Core Concept**
Bupivacaine poisoning is a form of local anesthetic systemic toxicity (LAST), which occurs when the drug enters the systemic circulation in toxic concentrations. This can happen due to accidental intravascular injection, overdose, or rapid absorption from a large surface area. LAST involves the inhibition of sodium channels in the nervous system, leading to central nervous system (CNS) and cardiovascular toxicity.
**Why the Correct Answer is Right**
The treatment of bupivacaine poisoning involves supportive care and the administration of lipid emulsion therapy. Lipid emulsion works by binding to the bupivacaine molecules, reducing their free fraction and thereby decreasing their toxic effects on the sodium channels in the CNS and heart. This is based on the concept of "lipid sink," where the lipophilic drug is sequestered in the lipid emulsion, reducing its concentration in the blood and tissues.
**Why Each Wrong Option is Incorrect**
* **Option A:** Administration of activated charcoal is not effective in treating bupivacaine poisoning, as the drug is highly lipophilic and has a large volume of distribution.
* **Option B:** Naloxone is used to reverse opioid overdose, not local anesthetic toxicity.
* **Option C:** Sodium bicarbonate may worsen the cardiac effects of bupivacaine poisoning by increasing the concentration of the drug in the blood.
**Clinical Pearl / High-Yield Fact**
Lipid emulsion therapy is a game-changer in the management of local anesthetic systemic toxicity, and it's essential to be familiar with its use in emergency situations.
**Correct Answer:** C. Lipid emulsion therapy