A patient came to OPD with excessive yawning, lacrimation, hypertension & tachycardia. An examination pupils were found to be dilated. Withdrawl from which of the following has lead to these symptoms?
**Core Concept**
The patient's symptoms, including excessive yawning, lacrimation, hypertension, tachycardia, and dilated pupils, are suggestive of an acute withdrawal syndrome from a substance that stimulates the central nervous system (CNS) and has sympathomimetic effects.
**Why the Correct Answer is Right**
The symptoms described are characteristic of withdrawal from an anticholinergic agent, such as an antihistamine or an anticholinergic medication. These substances block the action of acetylcholine at muscarinic receptors in the CNS, leading to increased sympathetic tone and withdrawal symptoms when they are abruptly discontinued. The excessive yawning, lacrimation, and dilated pupils are indicative of muscarinic receptor blockade, while hypertension and tachycardia reflect the increased sympathetic activity.
**Why Each Wrong Option is Incorrect**
* **Option A:** Withdrawal from opioids typically presents with symptoms such as anxiety, insomnia, sweating, and tremors, but not the specific combination of symptoms described in the question.
* **Option B:** Withdrawal from benzodiazepines can cause symptoms such as anxiety, insomnia, and tremors, but is not typically associated with dilated pupils or excessive yawning.
* **Option C:** Withdrawal from stimulants, such as cocaine or amphetamines, can cause symptoms such as fatigue, depression, and anxiety, but is not typically associated with the specific combination of symptoms described in the question.
**Clinical Pearl / High-Yield Fact**
When a patient presents with symptoms of withdrawal, it's essential to consider not only the substance they were using but also the specific symptoms they are experiencing, as different substances can cause distinct withdrawal syndromes.
**Correct Answer:** C. Withdrawal from an anticholinergic agent has led to these symptoms.