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.

Core Nursing Explanation Key Concept Analysis: This question assesses the priority nursing intervention for Acute angle-closure glaucoma, a true ophthalmologic emergency. The core pathophysiology involves a sudden, dramatic increase in Intraocular pressure (IOP) due to blockage of the Trabecular meshwork, preventing the outflow of aqueous humor. This elevated pressure can compress and permanently damage the Optic nerve within hours, leading to irreversible vision loss. The priority is always to lower the IOP as quickly as possible.

Answer Rationale: Key Point! The correct answer is to administer prescribed osmotic diuretics and miotic agents because this is the first-line, immediate medical treatment to rapidly lower IOP. Osmotic diuretics (e.g., mannitol IV) draw fluid from the eye into the bloodstream, reducing vitreous volume and pressure. Miotic agents (e.g., pilocarpine) constrict the pupil, which can pull the iris away from the trabecular meshwork and reopen the drainage angle. This pharmacological intervention directly targets the life-threatening (or sight-threatening) problem and must be initiated immediately.

Distractor Analysis:
Watch out for confusion! While pain relief (Option 1) is a compassionate and necessary intervention, it does not address the underlying cause of the emergency. Treating the symptom without treating the cause is not the priority in this life/sight-threatening situation.
Option 2, preparing for surgery, is often a subsequent step (like a peripheral iridotomy) but is not the immediate nursing priority upon arrival in the ED. Medical management to lower pressure must come first to stabilize the eye for any potential procedure.
Option 3, applying cool compresses, may provide minor symptomatic relief but has no significant effect on lowering IOP and is a non-priority, comfort measure.

Related Concepts: The nursing process dictates that the priority is always the ABCs (Airway, Breathing, Circulation) and, by extension, threats to survival or major organ function (like vision). This is an application of Maslow's Hierarchy of Needs, where physiological integrity (preventing blindness) takes precedence over comfort (pain) or safety/preparation for procedures.

Concept Summary

Concept	Description	Nursing Implication
Acute Angle-Closure Glaucoma	Sudden blockage of aqueous humor drainage, causing rapid IOP rise.	Treat as an emergency. Priority is rapid IOP reduction.
Intraocular Pressure (IOP)	Fluid pressure inside the eye. Normal is 10-21 mmHg. In crisis, it can exceed 50 mmHg.	Monitor. Goal of treatment is to lower to safe range.
Osmotic Diuretics (Mannitol)	IV medication that creates an osmotic gradient, pulling fluid from eye/body into vasculature.	Administer as ordered. Monitor for fluid/electrolyte shifts and signs of heart failure.
Miotic Agents (Pilocarpine)	Eye drops that constrict the pupil (miosis), pulling iris away from drainage angle.	Administer as ordered. Teach about blurred vision, brow ache as side effects.

Side-by-Side Comparison!

Feature	Acute Angle-Closure Glaucoma (Emergency)	Chronic Open-Angle Glaucoma (Common)
Onset	Sudden, acute	Insidious, slow progression
Pathophysiology	Mechanical blockage of drainage angle by iris.	Gradual clogging of trabecular meshwork.
Key Symptoms	Severe eye pain, nausea/vomiting, halos around lights, fixed, mid-dilated pupil, cloudy cornea, vision loss.	Often asymptomatic until late; gradual peripheral vision loss ("tunnel vision").
Pain	Prominent (due to rapid pressure rise and corneal edema).	Usually absent.
Priority Treatment	Immediate medical lowering of IOP (drugs), then laser/surgery.	Lifelong medication (prostaglandin analogs, beta-blockers) to control IOP.

Anatomy, Physiology & Pharmacology Points

• Anatomy: Aqueous humor is produced by the Ciliary body, flows through the pupil, and drains out via the Trabecular meshwork into the Canal of Schlemm. In angle-closure, the iris blocks this drainage pathway.
• Pharmacology:
  • Osmotic Diuretics: Mannitol works by increasing plasma osmolarity, creating a gradient that pulls water from tissues (including the vitreous humor of the eye) into the blood for renal excretion.
  • Miotics: Pilocarpine is a cholinergic agonist. It stimulates the iris sphincter muscle to contract (miosis), which also pulls on and opens the trabecular meshwork.
  • Other drugs used may include beta-blocker (timolol) or alpha-2 agonist (brimonidine) eye drops to reduce aqueous production.

Memory Tips

• Acute Glaucoma = PAIN: Painful eye, Acute onset, IOP high, Nausea/vomiting.
• Priority is Pressure, not Pain: Remember, the drug that lowers pressure (diuretic/miotic) comes before the pain med.
• Pupil Sign: In acute angle-closure, the pupil is often mid-dilated and non-reactive (fixed), unlike the constricted pupil seen with miotic use for treatment.

High-Frequency NCLEX Topics The NCLEX loves to test prioritization in emergencies. Acute angle-closure glaucoma is a classic example where the correct answer is not the most comforting or obvious intervention (pain meds) but the one that treats the underlying pathophysiology threatening a major sense organ. Be ready to choose the intervention that directly and immediately addresses the life/sight/limb-threatening problem.

Watch Out for Question Variations!

• Shift from Intervention to Assessment: "Which finding should the nurse report immediately to the provider?" → Answer: Sudden, severe eye pain with nausea and blurred vision.
• Shift to Patient Education: "The nurse is discharging a client after laser iridotomy for angle-closure glaucoma. Which statement by the client indicates understanding?" → Answer: "I will use my pilocarpine drops in the unaffected eye to prevent an attack there." (Prophylactic treatment of the other eye is standard).
• Shift to Medication Teaching: "A client is prescribed acetazolamide (Diamox) for glaucoma. The nurse should teach the client to report which side effect?" → Answer: Tingling in fingers/toes (paresthesia) or symptoms of kidney stones (flank pain).

Nursing Clinical Practice Guide Clinical Scenario: Mr. Johnson, 68, is brought to the ED by family. He is clutching his right eye, reporting sudden onset of severe, throbbing pain, blurred vision, and seeing rainbow-colored halos around lights over the past 2 hours. He has vomited once. On assessment, his right pupil is mid-dilated and does not constrict when you shine a light. The cornea appears hazy. He is anxious and in distress.

Nursing Intervention Strategy:

1. Immediate Assessment & Notification: Quickly assess visual acuity, pupil reaction, and report findings STAT to the provider. Do not delay treatment for extensive history-taking.
2. Priority Implementation: Upon receiving orders, immediately administer:
   • IV Mannitol: Use a large-bore IV. Infuse over 30-60 minutes as ordered. Monitor for signs of fluid overload (crackles, dyspnea) as fluid shifts into the vascular space.
   • Pilocarpine Eye Drops: Instill as ordered (may be every 5-15 minutes initially). Apply pressure to the Lacrimal punctum (inner corner of eye) for 1-2 minutes to minimize systemic absorption, which can cause bradycardia, sweating, or bronchospasm.
   • Other drops like timolol (beta-blocker) or apraclonidine (alpha-agonist) may also be ordered.
3. Concurrent Supportive Care:
   • Keep the room dimly lit to reduce photophobia.
   • Provide an emesis basin and antiemetics if ordered for nausea.
   • Administer analgesics (e.g., opioids) after or concurrently with pressure-lowering drugs, as pain control is important but secondary.
   • Keep the head of bed elevated to promote venous drainage from the eye.
4. Preparation & Education: Prepare the client for potential procedures like laser peripheral iridotomy (LPI). Educate that the procedure creates a small hole in the iris to allow fluid bypass. Stress the importance of using prophylactic drops in the other eye and attending all follow-up appointments.

Patient Safety and Precautions:

• Medication Cautions: Mannitol is contraindicated in severe renal disease, pulmonary edema, and active intracranial bleeding. Monitor intake/output and electrolytes.
• Systemic Effects of Eye Drops: Always occlude the tear duct. Be aware that beta-blocker drops (timolol) can cause bradycardia and bronchospasm—contraindicated in asthma/COPD.
• Never Dilate the Pupil: In any undiagnosed red eye, never administer mydriatics (pupil dilators) as they can trigger or worsen angle-closure.

Nursing Procedure & Medication Flow Administering Emergency Glaucoma Medications:

1. IV Osmotic Diuretic (Mannitol 20%):
   • Action: Increases plasma osmolarity → pulls fluid from eye/brain into blood → lowers IOP.
   • Dose/Rate: Typical dose 1-2 g/kg IV. Infuse over 30-60 min via an infusion pump.
   • Nursing Checks: Ensure patent IV line (can cause phlebitis). Monitor vital signs frequently for hypertension or signs of heart failure from fluid shift. Monitor for headache, confusion.
2. Instilling Multiple Eye Drops:
   • Order Matters: If multiple drops are ordered (e.g., pilocarpine, timolol, apraclonidine), wait at least 5 minutes between different medications to prevent wash-out and ensure absorption.
   • Technique: Tilt head back, pull lower lid down, instill drop into conjunctival sac, apply gentle pressure to lacrimal punctum for 1-2 min.

A Word from Your Senior Nurse "Remember, in the ED or on the floor, a patient complaining of a 'sudden, painful red eye' should set off your internal alarms for angle-closure glaucoma. Your quick recognition and immediate action to lower that pressure can literally save their sight. It’s a powerful example of how nursing knowledge directly impacts patient outcomes. When you study, link that severe pain and nausea to the skyrocketing pressure inside a closed space—the eye. Understanding the 'why' makes choosing the osmotic diuretic over the pain medication an instinct, not just a memorized test answer. That's the kind of clinical reasoning that makes a great nurse."