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Question of the Day

An elderly patient with a long-standing history of poorly controlled Type 2 Diabetes Mellitus presents with progressive vision loss in the right eye. Ophthalmic examination reveals prominent neovascularization on the iris surface (rubeosis iridis) and a dense cataract. Considering these clinical findings, which of the following statements regarding this patient's ocular condition is LEAST likely to be true?
Answer Details
✅ Correct Answer: B. The underlying pathophysiology of this condition is unlikely to involve significant retinal ischemia, despite the presence of rubeosis iridis.
📝 Explanation:

The correct answer is B because the statement 'The underlying pathophysiology of this condition is unlikely to involve significant retinal ischemia, despite the presence of rubeosis iridis' is LEAST likely to be true. Iris rubeosis (neovascularization of the iris) is a pathognomonic sign of severe, chronic retinal ischemia, most commonly due to advanced proliferative diabetic retinopathy or central retinal vein occlusion. The ischemic retina releases vascular endothelial growth factor (VEGF), which stimulates the growth of new, fragile blood vessels on the iris surface. Therefore, the presence of iris rubeosis strongly indicates significant retinal ischemia, making the statement that ischemia is 'unlikely' to be involved factually incorrect. This understanding is fundamental in ophthalmology and consistent with international best practices followed in South Africa.

🔤 Memory spark:

IR-ISK

❌ Why Wrong:

Option A is incorrect because a significant, vision-impairing cataract is indeed a common comorbidity in individuals with long-standing diabetes mellitus. Diabetics are prone to developing cataracts at an earlier age and with more rapid progression compared to the general population, making this statement highly likely to be true.
Option C is incorrect because the vignette explicitly states that ophthalmic examination reveals 'prominent neovascularization on the iris surface (rubeosis iridis)'. This statement is a direct observation and definition of the condition described, making it factually true and not the answer to 'LEAST likely to be true.'
Option D is incorrect because elevated intraocular pressure, potentially leading to neovascular glaucoma, is a highly anticipated and severe complication of iris rubeosis. The new vessels in rubeosis iridis can grow over and obstruct the trabecular meshwork, impairing aqueous humor outflow and causing a significant, often rapid, rise in IOP. This statement is therefore highly likely to be true.

🏥 Setting:

Ophthalmology / Emergency Medicine

⏰ Urgency:

Critical

🎯 Learning Objective:

Recognize iris rubeosis as a critical sign of severe retinal ischemia and its association with neovascular glaucoma, necessitating urgent ophthalmologic intervention.

🗝️ Key Teaching:

Iris rubeosis signifies severe retinal ischemia, often due to diabetic retinopathy, driven by VEGF. It carries a high risk of neovascular glaucoma and elevated IOP, requiring immediate ophthalmology referral.

💎 Clinical Pearls:

Iris rubeosis = severe retinal ischemia; VEGF-driven; Diabetic complication; High risk of neovascular glaucoma and elevated IOP; Urgent referral to prevent blindness.

📖 Reference:

General ophthalmological consensus, consistent with international guidelines (e.g., American Academy of Ophthalmology Preferred Practice Patterns: Diabetic Retinopathy).

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