Medical Management of Glaucoma Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Medical Management of Glaucoma. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Medical Management of Glaucoma Indian Medical PG Question 1: Anti-glaucoma drug that acts by increasing uveoscleral outflow is
- A. Dorzolamide
- B. Latanoprost (Correct Answer)
- C. Pilocarpine
- D. Timolol
Medical Management of Glaucoma Explanation: ***Latanoprost***
- **Latanoprost** is a **prostaglandin F2α analog** that effectively lowers intraocular pressure by significantly increasing **uveoscleral outflow**.
- It works by remodeling the extracellular matrix in the ciliary body and sclera, which facilitates the drainage of aqueous humor through the uveoscleral pathway.
*Dorzolamide*
- **Dorzolamide** is a **topical carbonic anhydrase inhibitor** that reduces the production of aqueous humor, thus lowering intraocular pressure.
- It does not directly affect the uveoscleral outflow pathway.
*Pilocarpine*
- **Pilocarpine** is a **cholinergic agonist** that primarily works by increasing the **trabecular outflow** of aqueous humor through contraction of the ciliary muscle [1].
- It does not significantly influence the uveoscleral outflow pathway.
*Timolol*
- **Timolol** is a **beta-adrenergic blocker** that reduces aqueous humor production by the ciliary body [1].
- Its mechanism of action involves decreasing the formation, rather than increasing the outflow, of aqueous humor [1].
Medical Management of Glaucoma Indian Medical PG Question 2: What is the best drug for open-angle glaucoma?
- A. Latanoprost (Correct Answer)
- B. Pilocarpine
- C. Physostigmine
- D. Apraclonidine
Medical Management of Glaucoma Explanation: Latanoprost
- Latanoprost is a prostaglandin analog and is often considered a first-line treatment for open-angle glaucoma due to its efficacy in reducing intraocular pressure (IOP) and its once-daily dosing.
- It works by increasing the outflow of aqueous humor through the uveoscleral pathway, thereby lowering IOP.
Pilocarpine
- Pilocarpine is a cholinergic agonist that causes miosis and ciliary muscle contraction [3], increasing the outflow of aqueous humor through the trabecular meshwork [4].
- While effective, its side effects (e.g., accommodative spasm, miosis) [1] and more frequent dosing make it generally a second-line or third-line agent for long-term management compared to prostaglandins.
Physostigmine
- Physostigmine is an acetylcholinesterase inhibitor that indirectly increases acetylcholine, mimicking cholinergic stimulation.
- Although it can lower IOP, it is generally not used for open-angle glaucoma due to significant side effects and the availability of safer, more effective alternatives [1].
Apraclonidine
- Apraclonidine is an alpha-2 adrenergic agonist [2] used primarily for short-term control of IOP, especially before or after ocular surgery, or as an adjunct therapy.
- Its efficacy as a long-term monotherapy for open-angle glaucoma is limited by tachyphylaxis and potential for significant systemic side effects with chronic use.
Medical Management of Glaucoma Indian Medical PG Question 3: The α2 agonist used in glaucoma is:
- A. Brimonidine (Correct Answer)
- B. Guanabenz
- C. Guanfacine
- D. Tizanidine
Medical Management of Glaucoma Explanation: ***Correct: Brimonidine***
- **Brimonidine** is an **α2-adrenergic agonist** commonly used in the treatment of glaucoma
- It works by reducing **aqueous humor production** and increasing **uveoscleral outflow**, thereby lowering intraocular pressure
- Available as eye drops (0.1%, 0.15%, 0.2% concentrations)
*Incorrect: Guanfacine*
- **Guanfacine** is an **α2A-adrenergic agonist** primarily used to treat **attention deficit hyperactivity disorder (ADHD)** and **hypertension**
- It does not have a primary role in glaucoma treatment
*Incorrect: Guanabenz*
- **Guanabenz** is an **α2-adrenergic agonist** that acts centrally to reduce **sympathetic outflow**, used mainly as an **antihypertensive agent**
- It is not indicated for the treatment of glaucoma
*Incorrect: Tizanidine*
- **Tizanidine** is an **α2-adrenergic agonist** primarily used as a **muscle relaxant** to manage spasticity
- It is not used for glaucoma
Medical Management of Glaucoma Indian Medical PG Question 4: Pilocarpine is used in all of the following except:
- A. Primary, Open Angle Glaucoma
- B. Acute Angle Closure Glaucoma
- C. Malignant Glaucoma (Correct Answer)
- D. Chronic Synechial Angle Closure Glaucoma
Medical Management of Glaucoma Explanation: ***Malignant Glaucoma***
- **Pilocarpine** is contraindicated in **malignant glaucoma** because it can worsen the condition by causing **ciliary body edema** and anterior displacement of the lens-iris diaphragm.
- This form of glaucoma requires treatment aimed at posterior displacement of the lens-iris diaphragm, often involving **cycloplegics**, **hyperosmotic agents**, or surgical interventions.
*Primary, Open Angle Glaucoma*
- **Pilocarpine** is an effective **miotic agent** that increases aqueous humor outflow through the **trabecular meshwork**, thereby lowering intraocular pressure.
- It can be used as a treatment for **primary open-angle glaucoma**, although it is less commonly used due to its side effects and the availability of better-tolerated medications.
*Acute Angle Closure Glaucoma*
- **Pilocarpine** is typically used in the management of **acute angle-closure glaucoma** after the intraocular pressure has been acutely lowered by other agents.
- It works by inducing **miosis**, which pulls the iris away from the **trabecular meshwork**, opening the angle and facilitating aqueous outflow.
*Chronic Synechial Angle Closure Glaucoma*
- In **chronic synechial angle-closure glaucoma**, **pilocarpine** can be used to break or prevent the formation of new **peripheral anterior synechiae** by constricting the pupil.
- However, its effectiveness is limited if extensive synechiae have already formed, as these physically block the outflow pathway.
Medical Management of Glaucoma Indian Medical PG Question 5: Beta-blockers should be used with caution in patients with?
- A. Hypertension
- B. CHF
- C. Conduction defect (Correct Answer)
- D. Glaucoma
Medical Management of Glaucoma Explanation: ***Conduction defect***
- Beta-blockers **slow heart rate** and **decrease AV nodal conduction**, which can worsen pre-existing conduction defects like **AV block** or **sick sinus syndrome**.
- Their use can lead to **symptomatic bradycardia** or complete heart block in susceptible individuals.
- This represents a **strong relative contraindication** requiring significant caution.
*Hypertension*
- Beta-blockers are a **first-line treatment for hypertension**, effectively lowering blood pressure by reducing cardiac output and renin release.
- They are generally **well-tolerated** and beneficial in most hypertensive patients.
*Glaucoma*
- Topical beta-blockers, such as **timolol**, are a common treatment for open-angle glaucoma as they **reduce aqueous humor production**, thereby lowering intraocular pressure.
- Systemic use of beta-blockers does not typically worsen glaucoma and may even offer some benefit.
*CHF*
- While certain beta-blockers (**carvedilol, metoprolol succinate, bisoprolol**) are now proven beneficial in **chronic heart failure with reduced ejection fraction (HFrEF)**, they do require careful use.
- They must be **initiated at low doses and carefully titrated** to avoid acute decompensation, and are **contraindicated in acute decompensated heart failure**.
- However, **conduction defects** represent a **stronger contraindication** where beta-blockers can cause life-threatening bradycardia or complete heart block, making it the best answer for conditions requiring the most caution.
Medical Management of Glaucoma Indian Medical PG Question 6: Cardioselective β-blocker used in glaucoma?
- A. Timolol
- B. Betaxolol (Correct Answer)
- C. Acebutalol
- D. Carvedilol
Medical Management of Glaucoma Explanation: ***Betaxolol***
- **Betaxolol** is a **cardioselective β1-adrenergic receptor blocker** that reduces aqueous humor production, making it suitable for glaucoma patients, especially those with pulmonary disease.
- Its **selectivity for β1 receptors** minimizes systemic side effects on the lungs (bronchoconstriction) compared to non-selective β-blockers.
*Timolol*
- **Timolol** is a **non-selective β-blocker** commonly used in glaucoma to reduce intraocular pressure.
- It blocks both **β1 and β2 receptors**, which can lead to systemic side effects like bronchoconstriction and bradycardia, making it less suitable for patients with **asthma or COPD**.
*Acebutalol*
- **Acebutalol** is a **cardioselective β1-blocker** with **intrinsic sympathomimetic activity (ISA)**, primarily used for hypertension and arrhythmias.
- While cardioselective, it is **not commonly formulated or indicated for topical ocular use** in glaucoma.
*Carvedilol*
- **Carvedilol** is a **non-selective β-blocker** with **alpha-1 adrenergic blocking activity**, primarily used for heart failure and hypertension.
- It is **not used for glaucoma** as it is not formulated for topical ophthalmic application and its systemic effects are not ideal for this purpose.
Medical Management of Glaucoma Indian Medical PG Question 7: What condition are miotics the treatment of choice for?
- A. Angle closure glaucoma
- B. Open-angle glaucoma (Correct Answer)
- C. Buphthalmos
- D. Sympathetic ophthalmia
Medical Management of Glaucoma Explanation: ***Open-angle glaucoma***
- Miotics, such as **pilocarpine**, are a classical treatment option for **primary open-angle glaucoma (POAG)**.
- They work by **contracting the ciliary muscle**, which opens up the **trabecular meshwork** and increases aqueous humor outflow.
- This results in **reduction of intraocular pressure (IOP)**, the primary goal in glaucoma management.
- Though less commonly used today due to side effects (brow ache, miosis affecting vision), they remain effective and are particularly useful in patients who cannot tolerate other medications.
*Angle closure glaucoma*
- Miotics are **contraindicated in acute angle-closure glaucoma** as they can worsen pupillary block during the acute attack.
- The initial treatment involves **IOP-lowering agents, systemic medications, and laser iridotomy**, not miotics.
- Miotics may have a limited role in chronic angle closure after definitive treatment, but they are NOT the treatment of choice.
*Buphthalmos*
- This refers to **enlargement of the eyeball** in infants due to congenital glaucoma.
- Management primarily involves **surgical intervention** (goniotomy, trabeculotomy) to address the developmental anomalies of the drainage angle.
- Medical management alone, including miotics, is insufficient.
*Sympathetic ophthalmia*
- A rare **bilateral granulomatous panuveitis** following penetrating trauma or surgery to one eye.
- Treated with **corticosteroids and immunosuppressive agents**.
- Miotics have no role in managing this inflammatory condition.
Medical Management of Glaucoma Indian Medical PG Question 8: A patient has been diagnosed with Primary Open Angle Glaucoma (POAG). On eliciting history, it is observed that the patient is a known case of bronchial asthma. What is the drug of choice for POAG in this patient?
- A. Gemeprost
- B. Alprostadil
- C. Latanoprost (Correct Answer)
- D. Carboprost
Medical Management of Glaucoma Explanation: ***Latanoprost***
- **Latanoprost** is a **prostaglandin analog** and is considered a **first-line drug of choice** for POAG due to its excellent efficacy and tolerability profile, especially in patients with **bronchial asthma**.
- It works by increasing the **uveoscleral outflow** of aqueous humor, thus lowering **intraocular pressure** without causing systemic effects like bronchoconstriction.
*Gemeprost*
- **Gemeprost** is a **prostaglandin E1 analog** primarily used for **cervical ripening** and **abortion**, not for glaucoma treatment.
- It has no role in managing **intraocular pressure** and would be an inappropriate choice for POAG.
*Alprostadil*
- **Alprostadil** is another **prostaglandin E1 analog** used for **erectile dysfunction** and maintaining **patency of the ductus arteriosus** in neonates.
- It does not lower **intraocular pressure** and is not indicated for the treatment of glaucoma.
*Carboprost*
- **Carboprost** is a **prostaglandin F2α analog** mainly used to **manage postpartum hemorrhage** due to its potent uterotonic effects.
- While it is a prostaglandin, it is not used in the treatment of glaucoma and has significant systemic side effects.
Medical Management of Glaucoma Indian Medical PG Question 9: Which drug is contraindicated in angle-closure glaucoma?
- A. Atropine (Correct Answer)
- B. Pilocarpine
- C. Timolol
- D. Dorzolamide
Medical Management of Glaucoma Explanation: ***Atropine***
- **Atropine** is an **anticholinergic** agent that causes **mydriasis** (pupil dilation) by blocking muscarinic receptors in the iris sphincter muscle.
- In angle-closure glaucoma, pupillary dilation can narrow the **anterior chamber angle**, preventing aqueous humor outflow and acutely increasing **intraocular pressure**.
*Pilocarpine*
- **Pilocarpine** is a **muscarinic agonist** that causes **miosis** (pupil constriction) and contraction of the ciliary muscle, widening the anterior chamber angle.
- This action facilitates **aqueous humor outflow**, making it a treatment for, not contraindicated in, angle-closure glaucoma.
*Timolol*
- **Timolol** is a **beta-blocker** that reduces aqueous humor production, thereby lowering intraocular pressure.
- It does not significantly affect pupil size or the anterior chamber angle, making it a safe and effective treatment for various forms of glaucoma, including open-angle.
*Dorzolamide*
- **Dorzolamide** is a **carbonic anhydrase inhibitor** that reduces aqueous humor production.
- Like timolol, it primarily acts to lower intraocular pressure without affecting pupil size or the anterior chamber angle, making it suitable for glaucoma treatment.
Medical Management of Glaucoma Indian Medical PG Question 10: What is the first-line treatment for acute angle closure glaucoma?
- A. Pilocarpine
- B. Beta blocker eyedrops
- C. IV mannitol
- D. Acetazolamide (Correct Answer)
Medical Management of Glaucoma Explanation: **Acetazolamide**
- **Acetazolamide** (oral or intravenous) is a carbonic anhydrase inhibitor that rapidly reduces intraocular pressure by decreasing aqueous humor production, making it the **first-line medical treatment** for acute angle-closure glaucoma.
- While other agents are used, acetazolamide provides the quickest and most significant initial reduction in **intraocular pressure (IOP)**, which is crucial in preventing permanent vision loss.
*IV mannitol*
- **Intravenous mannitol** is an osmotic diuretic used to draw fluid from the vitreous humor to lower **IOP** significantly, but it is typically reserved for cases where **acetazolamide** alone is insufficient or for very high **IOPs**.
- It is often considered a second-line or adjunctive agent rather than the initial first-line treatment.
*Pilocarpine*
- **Pilocarpine** is a miotic agent that constricts the pupil, which helps to pull the iris away from the trabecular meshwork and open the angle.
- However, it should only be administered *after* the **intraocular pressure** has been significantly lowered (e.g., with acetazolamide), as it can worsen angle closure in an inflamed eye with very high **IOP**.
*Beta blocker eyedrops*
- **Topical beta-blockers** (e.g., timolol) reduce **IOP** by decreasing aqueous humor production and are a common treatment for various types of glaucoma.
- While useful in acute angle-closure glaucoma, they act more slowly than **acetazolamide** and are typically used as an adjunct rather than the sole initial first-line treatment.
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