All of the following statements about pralidoxime in organophosphate poisoning are true except:-
**Core Concept**
Pralidoxime is a cholinesterase reactivator used in the treatment of organophosphate poisoning. It works by reactivating the enzyme acetylcholinesterase, which is inhibited by organophosphates, thereby reversing the accumulation of acetylcholine in the synaptic cleft.
**Why the Correct Answer is Right**
Pralidoxime acts by covalently binding to the phosphorylated acetylcholinesterase enzyme, forming a stable complex that is no longer inhibited by the organophosphate. This allows the enzyme to regain its activity, thereby reducing the excessive accumulation of acetylcholine. Pralidoxime is most effective when administered early in the course of organophosphate poisoning.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because pralidoxime does indeed reactivate acetylcholinesterase and is a standard treatment for organophosphate poisoning.
**Option B:** Incorrect because pralidoxime does not have significant anticholinergic effects, making it a safer choice compared to atropine in some cases.
**Option C:** Incorrect because pralidoxime is primarily used to treat organophosphate poisoning, not carbamate poisoning.
**Clinical Pearl / High-Yield Fact**
It's essential to note that pralidoxime should be given as soon as possible after organophosphate exposure, ideally within 30 minutes, as its effectiveness decreases with time.
**Correct Answer: C. Pralidoxime is primarily used for carbamate poisoning.**