A nurse is caring for a client with acute angle-closure glaucoma who presents to the emergency department with severe eye pain and nausea. Which nursing intervention should be the highest priority?

Acute angle-closure glaucoma is an ophthalmologic emergency requiring immediate reduction of intraocular pressure to prevent permanent vision loss. Administering osmotic diuretics and miotic agents directly addresses the pathophysiology by promoting aqueous humor outflow. Other interventions like pain management or surgery are important but secondary to rapid pressure reduction.

Understanding the Priority: Acute Angle-Closure Glaucoma

The client's presentation of severe eye pain and nausea, coupled with the diagnosis of acute angle-closure glaucoma (AACG), signals a critical rise in intraocular pressure (IOP). This is a true ophthalmic emergency where the normal outflow of aqueous humor is suddenly blocked, typically at the angle where the iris meets the cornea. The immediate threat is irreversible damage to the optic nerve and permanent vision loss. The highest priority intervention is the one that most rapidly lowers the IOP to prevent this outcome.

Why Option 4 is the Highest Priority

Administering prescribed osmotic diuretics and miotic agents is the correct answer because it directly targets the underlying pathophysiology. This approach constitutes the first-line, emergency medical management to break the acute attack.

- Osmotic Diuretics (e.g., intravenous mannitol): These agents create an osmotic gradient between the blood and the ocular fluids. By increasing plasma osmolarity, they rapidly draw fluid out of the vitreous humor and anterior chamber, leading to a swift decrease in IOP. This systemic approach is critical when the IOP is dangerously high, as seen in the case reports where pressures reached 59 mmHg ^[1] and 57 mmHg ^[2], far above the normal range of 10-21 mmHg.
- Miotic Agents (e.g., pilocarpine): These topical medications constrict the pupil (miosis). This action pulls the peripheral iris taut, physically opening the trabecular meshwork at the drainage angle. By reopening the blocked outflow pathway, aqueous humor can exit the eye, directly addressing the mechanical cause of the pressure spike.

The clinical literature reinforces this as the immediate step. A case of AACG secondary to trauma describes a patient presenting with an IOP of 59 mmHg ^[1], a scenario where rapid medical reduction of pressure is paramount before any definitive procedure. Similarly, a case of drug-induced AACG from an over-the-counter cold medication details that management involved the immediate discontinuation of the offending agent and medical therapy to lower IOPs of 57 mmHg and 50 mmHg ^[2]. These cases highlight that the nurse's priority is to initiate the prescribed protocol to achieve rapid IOP reduction.

Analysis of Other Options

- Option 1 (Administer prescribed analgesics): While pain management is an important nursing function, it is not the highest priority. The pain is a symptom of the massively elevated IOP. Administering an analgesic without addressing the pressure would mask a key clinical indicator without stopping the ongoing optic nerve damage. The priority is to treat the cause, not just the symptom.
- Option 2 (Prepare the client for immediate surgical intervention): Surgery is a definitive treatment, but it is not the immediate first step. The standard of care, as supported by the literature, is to medically stabilize the IOP and reduce inflammation before surgery. A study on anterior segment changes notes that cataract surgery was performed "after medical stabilization of IOP and inflammation" . Operating on an acutely inflamed eye with extremely high pressure increases surgical risk and complications. Another study comparing surgical iridectomy to laser iridotomy suggests that the duration of the attack influences outcomes, implying that initial medical control is a crucial bridge to definitive treatment .
- Option 3 (Apply cool compresses to the affected eye): This is a comfort measure with no effect on the underlying pathology. A cool compress cannot lower IOP or open the closed drainage angle. In the context of an emergency where every minute of high pressure can lead to permanent vision loss, this intervention is not a priority and could dangerously delay life-sight-saving treatment.