Tiotropium is contra-indicated in:
**Core Concept**
Tiotropium is an anticholinergic medication used in the management of chronic obstructive pulmonary disease (COPD) and asthma. It works by inhibiting the action of acetylcholine at muscarinic receptors in the lungs, thereby inducing bronchodilation.
**Why the Correct Answer is Right**
Tiotropium is contraindicated in patients with narrow-angle glaucoma due to its anticholinergic properties, which can cause pupillary dilation and increase intraocular pressure. The muscarinic receptors in the eye are responsible for controlling pupil size and aqueous humor production. When tiotropium blocks these receptors, it can lead to an increase in intraocular pressure, exacerbating narrow-angle glaucoma.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the contraindication of tiotropium. While tiotropium can cause dry mouth and other anticholinergic side effects, these are not the primary concern in narrow-angle glaucoma.
**Option B:** Tiotropium is not contraindicated in patients with urinary retention. In fact, its anticholinergic effects can sometimes be useful in managing urinary incontinence.
**Option C:** Tiotropium is not contraindicated in patients with hyperthyroidism. While anticholinergic medications can sometimes worsen hyperthyroidism, this is not a primary concern with tiotropium.
**Clinical Pearl / High-Yield Fact**
When prescribing anticholinergic medications like tiotropium, it's essential to ask about a patient's medical history, particularly regarding eye problems like glaucoma. A simple question about eye health can help prevent serious complications.
**Correct Answer: D. Narrow-angle glaucoma.