rnIn which of the following poisonings Mc Ewan Sign is seen?
**Core Concept**
Mc Ewan Sign, also known as the "three-bottle sign," is a clinical indicator of poisoning. It refers to the presence of three distinct layers in the stomach contents after a poisoning, typically seen during gastric lavage or endoscopy. This sign is indicative of a specific type of poisoning.
**Why the Correct Answer is Right**
The McEwan Sign is specifically seen in poisoning with **Organophosphates (OPs)**. Organophosphates are a class of cholinesterase inhibitors, which means they interfere with the enzyme acetylcholinesterase, leading to an accumulation of acetylcholine in the synapses. This results in overstimulation of nicotinic and muscarinic receptors, causing a range of systemic effects including bradycardia, salivation, and gastrointestinal symptoms. The three-bottle sign is thought to be due to the presence of an upper layer of gastric contents, a middle layer of undigested food, and a lower layer of bile-stained fluid.
**Why Each Wrong Option is Incorrect**
* **Option A:** This is incorrect as the McEwan Sign is not characteristic of poisoning with **Amanita phalloides**. Amanita poisoning presents with different clinical features, including gastrointestinal symptoms, liver dysfunction, and renal failure.
* **Option B:** This is incorrect as the McEwan Sign is not seen in poisoning with **Digoxin**. Digoxin toxicity presents with cardiac arrhythmias, nausea, and visual disturbances.
* **Option C:** This is incorrect as the McEwan Sign is not a feature of **Carbon monoxide poisoning**. Carbon monoxide poisoning presents with headache, dizziness, and respiratory distress.
**Clinical Pearl / High-Yield Fact**
In cases of suspected organophosphate poisoning, it is essential to administer atropine and pralidoxime (2-PAM) promptly to counteract the effects of acetylcholine accumulation.
**Correct Answer:** C.