In organophosphorus compound poisoning, atropine can reverse all the following signs except –
**Core Concept**
In organophosphorus compound poisoning, the enzyme acetylcholinesterase is inhibited, leading to an accumulation of acetylcholine in the synaptic cleft. This results in overstimulation of muscarinic and nicotinic receptors, causing various systemic and neuromuscular symptoms. Atropine, an antimuscarinic agent, can reverse some of these effects by blocking muscarinic receptors.
**Why the Correct Answer is Right**
Atropine can reverse signs of organophosphorus poisoning such as bradycardia, salivation, sweating, bronchospasm, and diarrhea by blocking the muscarinic receptors. However, atropine does not reverse the neuromuscular effects caused by the nicotinic receptor overstimulation, such as muscle weakness and paralysis. This is because atropine does not block nicotinic receptors and the neuromuscular junction is affected by the accumulation of acetylcholine.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is intentionally left blank as it's not provided in the question.
**Option B:** This option is not provided in the question.
**Option C:** This option is not provided in the question.
**Clinical Pearl / High-Yield Fact**
Atropine can also be used to reverse the bronchospasm caused by organophosphorus poisoning, but it should be used cautiously in patients with underlying respiratory conditions.
**Correct Answer:** A.