Atropine when used as a pre–medication causes all of the following symptoms except:
**Core Concept**
Atropine, an anticholinergic medication, is often used as a pre-medication to reduce salivation and bronchial secretions before surgery. It works by blocking the action of acetylcholine at muscarinic receptors in the central and peripheral nervous system.
**Why the Correct Answer is Right**
Atropine's anticholinergic effects lead to various symptoms, including:
- **Dry mouth (xerostomia)** due to reduced salivation.
- **Tachycardia** resulting from decreased vagal tone on the heart.
- **Mydriasis** (pupil dilation) caused by relaxation of the iris sphincter muscle.
- **Increased intraocular pressure** due to reduced outflow of aqueous humor.
**Why Each Wrong Option is Incorrect**
* **Option A:** Not provided in the question, so we'll move on to the next options.
* **Option B:** Not mentioned, so we'll skip to the next options.
* **Option C:** Not provided in the question, so we'll move on to the next options.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that atropine can also cause **urinary retention**, especially in patients with pre-existing urinary issues. This is due to the anticholinergic effects on the detrusor muscle.
**Correct Answer:**
(Note: Since the options A, B, and C were not provided, we cannot determine the correct answer. Please provide the options for a complete explanation.)