Topical medicine atropine sulphate is used in all of the following conditions, EXCEPT?

NORCET -4 , 2023

Pharmacology

Easy

Appeared in: NORCET -4 , 2023

Explanation

Atropine is an anticholinergic drug that causes significant pupillary dilation (mydriasis).
In closed-angle glaucoma, the anatomical angle for aqueous humor drainage is already narrow.
Mydriasis causes the iris to bunch up and physically obstruct this drainage angle, blocking the outflow of aqueous humor.
This blockage leads to a rapid and dangerous increase in intraocular pressure (IOP), precipitating an acute glaucoma attack, which is a medical emergency.

Visual 1: Diagram: Comparison of a normal open iridocorneal angle versus a narrow angle in closed-angle glaucoma.
Visual 2: Animation: Showing how pupillary dilation (mydriasis) caused by atropine physically blocks the trabecular meshwork in a narrow-angle eye, leading to increased IOP.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Contraindications of topical atropine sulfate as background academic context rather than a clinical decision trigger.
A critical nursing responsibility before administering any mydriatic agent like atropine is to assess or check the patient's history for glaucoma. Administering it to a patient with undiagnosed narrow angles can precipitate an acute, sight-threatening emergency.
An acute angle-closure glaucoma attack presents with severe eye pain, headache, nausea, vomiting, blurred vision, and seeing halos around lights. It requires immediate medical intervention to lower the IOP and prevent permanent vision loss.
What if? If the patient has open-angle glaucoma (the more common type), mydriatics can often be used with caution, as the drainage angle is not anatomically narrow. However, the primary treatment for open-angle glaucoma involves drugs that either decrease aqueous production or increase its outflow (e.g., miotics, beta-blockers).

How to Approach the Question

First, identify the keyword 'EXCEPT'. This signals that three of the options are conditions where atropine is used, and one is a condition where it is not used or is contraindicated.
Next, recall the primary pharmacological action of atropine on the eye: it is a potent mydriatic (dilates the pupil) and cycloplegic (paralyzes the ciliary muscle).
Consider the pathophysiology of each option and analyze how pupil dilation would affect it.
For Corneal Ulcer and Uveitis, muscle paralysis (cycloplegia) is therapeutic as it relieves pain.
For Cataract, pupil dilation (mydriasis) is necessary for examination and surgery.
For Closed-Angle Glaucoma, pupil dilation is harmful because it physically obstructs fluid drainage from the eye.

Concept Tested & Keywords

Concept Tested: Contraindications of topical atropine sulfate
Stem keywords: atropine sulphate, topical medicine, conditions
Lead-in keywords: EXCEPT
Negative lead-in flag: Question asks for the exception where the medication is NOT used.

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