Delayed onset polyneuropathy after organophosphorous poisoning is seen after a period of:
**Core Concept**
Delayed onset polyneuropathy is a rare but serious complication of organophosphorous poisoning, which occurs due to the accumulation of a toxic metabolite that inhibits axonal transport and leads to demyelination and axonal degeneration.
**Why the Correct Answer is Right**
The correct answer is associated with the accumulation of a toxic metabolite called phosphorylated neurotoxic intermediate (PNI), which is formed after the initial hydrolysis of the organophosphorous compound by acetylcholinesterase. PNI accumulates in the body over time and causes delayed onset polyneuropathy. The mechanism of PNI-induced neuropathy is thought to involve the inhibition of axonal transport, leading to the accumulation of neurofilaments and the subsequent degeneration of axons.
**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because it is not the correct timeframe for the development of delayed onset polyneuropathy.
**Option B:** This is incorrect because it refers to a different type of neuropathy that is associated with the initial exposure to organophosphorous compounds, rather than the delayed onset type.
**Option C:** This is incorrect because it is not the correct timeframe for the development of delayed onset polyneuropathy.
**Clinical Pearl / High-Yield Fact**
Delayed onset polyneuropathy is a rare but serious complication of organophosphorous poisoning, and it can occur weeks to months after the initial exposure. It is essential to monitor patients for this complication, especially if they have been treated for organophosphorous poisoning.
**Correct Answer:** D. 14 days to 6 weeks.