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Carbonic Anhydrase Inhibitors | 마이메르시 MyMerci
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Carbonic Anhydrase Inhibitors

NCLEX Review Guide: Carbonic Anhydrase Inhibitors for Eye and Ear Medications

Mechanism of Action & Therapeutic Uses

How Carbonic Anhydrase Inhibitors Work

  • Carbonic anhydrase inhibitors block the enzyme carbonic anhydrase, which reduces aqueous humor production in the eye by up to 50%.
  • These medications decrease intraocular pressure (IOP) by inhibiting sodium and bicarbonate transport, leading to reduced fluid formation.
  • Primary indication is open-angle glaucoma and ocular hypertension when other treatments are insufficient.

Key Points

  • Main therapeutic effect: Reduces IOP by decreasing aqueous humor production
  • Used as adjunctive therapy, not first-line treatment
  • Systemic effects occur due to carbonic anhydrase inhibition throughout the body

Common Medications & Administration

Key Drugs to Remember

  • Acetazolamide (Diamox) - Most commonly used systemic carbonic anhydrase inhibitor, available in oral and IV forms.
  • Dorzolamide (Trusopt) - Topical ophthalmic solution applied 2-3 times daily directly to the affected eye.
  • Brinzolamide (Azopt) - Topical ophthalmic suspension with less stinging sensation than dorzolamide.

Memory Aid

"ACE-D-B" - Acetazolamide (systemic), Dorzolamide (drops), Brinzolamide (better tolerance)

Side Effects & Nursing Considerations

Systemic Side Effects (Acetazolamide)

  • Metabolic acidosis - Monitor ABGs and electrolytes, especially in patients with kidney or liver disease.
  • Hypokalemia and hyponatremia - Check electrolyte levels regularly and monitor for muscle weakness or cardiac arrhythmias.
  • Kidney stones may develop due to alkaline urine and increased calcium excretion.
  • Paresthesias (tingling in fingers/toes) are common and usually harmless but should be documented.

Topical Side Effects (Dorzolamide/Brinzolamide)

  • Local eye irritation, burning, and stinging upon instillation (more common with dorzolamide).
  • Bitter taste in mouth due to systemic absorption through nasolacrimal duct.
  • Blurred vision temporarily after administration - advise patients to wait before driving.

Key Points

  • Systemic forms cause more significant side effects than topical
  • Monitor electrolytes and acid-base balance with oral acetazolamide
  • Topical forms still have systemic absorption - assess for sulfa allergies

Contraindications & Drug Interactions

Important Contraindications

  • Sulfa allergy - All carbonic anhydrase inhibitors are sulfonamide derivatives and are contraindicated.
  • Severe kidney or liver impairment increases risk of toxicity and metabolic complications.
  • Closed-angle glaucoma - These medications can worsen angle closure by causing lens swelling.

Systemic vs Topical Considerations

Systemic (Acetazolamide)Topical (Dorzolamide/Brinzolamide)
Significant electrolyte effectsMinimal systemic effects
Requires lab monitoringLocal eye assessment needed
Drug interactions commonFewer drug interactions

Clinical Scenarios & Patient Education

Clinical Case

A 65-year-old patient with open-angle glaucoma is prescribed dorzolamide eye drops. The patient reports a bitter taste after administration and asks if this is normal.

Nursing Response: Explain that bitter taste is a common side effect due to drainage through the tear duct into the throat. Teach proper instillation technique and nasolacrimal occlusion to minimize systemic absorption.

  1. Proper Eye Drop Administration: Wash hands, tilt head back, pull down lower eyelid
  2. Instill Drop: Place drop in conjunctival sac, avoid touching dropper to eye
  3. Nasolacrimal Occlusion: Apply gentle pressure to inner corner of eye for 1-2 minutes
  4. Wait Between Drops: If multiple eye medications, wait 5 minutes between different drops

Key Points

  • Patient education on proper administration technique is crucial
  • Explain expected side effects to improve compliance
  • Regular IOP monitoring needed to assess effectiveness

Common Pitfalls & Study Tips

Frequently Confused Concepts

  • Don't confuse with diuretics - While acetazolamide has diuretic effects, its primary ophthalmic use is IOP reduction.
  • Remember that topical forms still require sulfa allergy screening due to systemic absorption.
  • Open-angle vs closed-angle glaucoma - These medications are contraindicated in closed-angle glaucoma.

NCLEX Memory Aids

"CARBONIC" - Contraindicated in closed-angle, Acetazolamide systemic, Reduces aqueous humor, Bitter taste with drops, Open-angle treatment, Nasolacrimal occlusion, IOP reduction, Check for sulfa allergy

Quick Check

  • ☐ Can you name the three main carbonic anhydrase inhibitors?
  • ☐ Do you know the difference between systemic and topical side effects?
  • ☐ Can you explain proper eye drop administration technique?
  • ☐ Do you understand why sulfa allergy is a contraindication?

Remember: You're building the knowledge and skills to provide safe, effective patient care. Every medication you master brings you closer to becoming the nurse your patients need. Stay focused and keep pushing forward - you've got this! 💪

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