â– LECTURE OVERVIEW: Acute Angle-Closure Glaucoma is a sight-threatening medical emergency characterized by a sudden block in the outflow of aqueous humor, leading to a critical rise in intraocular pressure (IOP).
â– MOLECULAR & STRUCTURAL PATHOLOGY:
1. Pupil Blockage: In structurally predisposed eyes (e.g., hyperopic eyes with shallow anterior chambers), pupillary dilation brings the peripheral iris into contact with the lens. This blocks the passage of aqueous humor from the posterior chamber to the anterior chamber.
2. Iris Bowing: Trapped aqueous humor builds pressure behind the iris, bowing it forward (iris bombé).
3. Trabecular Occlusion: The peripheral bowed iris makes physical contact with the trabecular meshwork, completely closing the drainage angle.
4. Critical IOP Surge: Aqueous humor production continues, but drainage is blocked, causing IOP to surge from a normal range of 10-21 mmHg up to 50-80 mmHg, compressing the optic nerve.
â– IMMUNOLOGICAL & CYTOKINE SIGNALLING FLUX:
Pathogen exposure or cellular distress triggers antigen-presenting cell activation. This results in the release of pro-inflammatory cytokines (such as IL-1, TNF-alpha, and IL-6) and triggers receptor-mediated cellular chemotaxis.
â– COMPENSATORY HORMONAL & VASCULAR FEEDBACK:
Acute systemic shifts trigger immediate neural and hormonal reflexes to preserve blood flow to vital organs like the brain and kidneys.
[HY-BOARD-1396]
🌟 Dynamic Clinical Key:
Presents acutely with severe, unilateral eye pain, headache, nausea, blurred vision, and halos around lights. Examination reveals conjunctival injection, a cloudy and edematous cornea, and a fixed, mid-dilated pupil. Emergency treatment requires systemic acetazolamide, topical pilocarpine, and definitive laser peripheral iridotomy. Target specific monoclonal antibodies or immune suppressors to control the hyper-inflammatory cascade. Carefully evaluate the underlying cause of high blood pressure before aggressively suppressing compensatory vasoconstriction.