A boy is having diarrhoea, rhinorrhoea, sweating & lacrimation, what is the most probable diagnosis
**Core Concept**
The question is testing the diagnosis of organophosphate or carbamate poisoning, which is a medical emergency. These compounds inhibit acetylcholinesterase, an enzyme responsible for breaking down acetylcholine, leading to an accumulation of acetylcholine in the synaptic cleft and overstimulation of muscarinic and nicotinic receptors.
**Why the Correct Answer is Right**
The symptoms described, such as diarrhoea, rhinorrhoea, sweating, and lacrimation, are characteristic of muscarinic receptor overstimulation, which occurs due to the accumulation of acetylcholine. This is a classic presentation of organophosphate or carbamate poisoning, where the inhibition of acetylcholinesterase leads to an excessive stimulation of muscarinic receptors in the parasympathetic nervous system. The brain is also affected, leading to altered mental status, but the peripheral symptoms are more pronounced.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not match the described symptoms. Organophosphate or carbamate poisoning typically presents with muscarinic symptoms like rhinorrhoea, lacrimation, and diarrhoea.
**Option B:** This option is incorrect because it does not match the described symptoms. Organophosphate or carbamate poisoning typically presents with muscarinic symptoms like rhinorrhoea, lacrimation, and diarrhoea, but not typically with a rash.
**Option C:** This option is incorrect because it does not match the described symptoms. Organophosphate or carbamate poisoning typically presents with muscarinic symptoms like rhinorrhoea, lacrimation, and diarrhoea, but not typically with a history of recent travel.
**Option D:** This option is incorrect because it does not match the described symptoms. Organophosphate or carbamate poisoning typically presents with muscarinic symptoms like rhinorrhoea, lacrimation, and diarrhoea, but not typically with a history of recent exposure to a new medication.
**Clinical Pearl / High-Yield Fact**
In cases of suspected organophosphate or carbamate poisoning, atropine is the treatment of choice, as it can counteract the muscarinic symptoms by blocking the acetylcholine receptors. However, pralidoxime is also given to help regenerate acetylcholinesterase.
**Correct Answer:** C. Cholinergic syndrome.