Ophthalmology · Traumatic Eye Injury
The facts most likely to be tested
A hyphema is defined as the collection of blood in the anterior chamber of the eye, typically resulting from blunt ocular trauma.
Patients present with decreased visual acuity, eye pain, and a visible fluid-blood level in the anterior chamber on slit-lamp examination.
Initial management requires head elevation to 30-45 degrees to allow the blood to settle inferiorly and prevent further visual obstruction.
Sickle cell screening (hemoglobin electrophoresis) is mandatory in all patients with a hyphema to rule out sickle cell trait or disease, as these patients are at high risk for secondary glaucoma even with small elevations in intraocular pressure.
Intraocular pressure (IOP) elevation is the most common and dangerous complication, requiring treatment with topical beta-blockers or alpha-agonists.
Acetazolamide and other carbonic anhydrase inhibitors are strictly contraindicated in patients with known or suspected sickle cell disease due to the risk of inducing a sickling crisis in the anterior chamber.
Surgical evacuation (anterior chamber washout) is indicated for patients with corneal blood staining, intractable IOP elevation, or a total hyphema that fails to clear.
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A 22-year-old male presents to the emergency department after being struck in the right eye by a baseball. He reports significant eye pain and blurry vision. On physical examination, there is a visible layer of blood in the inferior anterior chamber. His intraocular pressure is 28 mmHg. He has no known past medical history, but his family history is significant for a blood disorder in his brother.
Which of the following medications is contraindicated in this patient?
Acetazolamide
The patient has a traumatic hyphema and a family history suggestive of sickle cell disease; carbonic anhydrase inhibitors like acetazolamide are contraindicated because they lower aqueous pH, which promotes sickling and can lead to a dangerous spike in intraocular pressure.
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Etiology / Epidemiology
Most common in blunt ocular trauma; also seen in post-surgical complications or spontaneous cases (e.g., sickle cell).
Clinical Manifestations
Visible blood in the anterior chamber; 8-ball hyphema is the classic, severe presentation.
Diagnosis
Diagnosis is clinical via slit-lamp examination; measure intraocular pressure (IOP) to assess for secondary glaucoma.
Treatment
Strict eye rest/shielding and topical cycloplegics; avoid NSAIDs due to antiplatelet effects.
Prognosis
Risk of secondary hemorrhage (rebleed) peaks at 3-5 days; monitor for elevated IOP.
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Epidemiology & Etiology
Primarily affects young males following blunt force trauma (sports, projectiles). Spontaneous cases are rare but associated with sickle cell disease or iris neovascularization. Always screen for coagulopathy if trauma is disproportionately minor.
Pertinent Anatomy
The anterior chamber is the space between the cornea and the iris. Blood accumulates here because the trabecular meshwork becomes obstructed by erythrocytes, impeding aqueous humor outflow.
Pathophysiology
Trauma causes rupture of the iris or ciliary body vessels, leading to hemorrhage into the anterior chamber. The blood settles inferiorly due to gravity. Sickle cell patients are at extreme risk for optic nerve damage even with small elevations in IOP due to sickling in the trabecular meshwork.
Clinical Manifestations
Patients present with pain, photophobia, and blurred vision. The pathognomonic finding is a fluid level of blood in the anterior chamber. A 8-ball hyphema (total black/dark red chamber) indicates total occlusion and is a surgical emergency.
Diagnosis
Diagnosis is confirmed via slit-lamp examination. Tonometry is mandatory to monitor for secondary glaucoma, though avoid if globe rupture is suspected. Assess for sickle cell trait/disease in all patients of African, Mediterranean, or Caribbean descent.
Treatment
Initial management includes eye shielding, head elevation to 30-45 degrees, and topical cycloplegics (e.g., atropine) to reduce ciliary spasm. NSAIDs are contraindicated as they increase rebleeding risk. If IOP is elevated, use topical beta-blockers or carbonic anhydrase inhibitors; avoid pilocarpine.
Prognosis
The most critical window is the 3-5 day post-injury period for rebleeding. Long-term complications include secondary glaucoma and optic atrophy. Patients require close follow-up to ensure the blood clears and IOP remains stable.
Differential Diagnosis
Subconjunctival hemorrhage: blood is under the conjunctiva, not in the anterior chamber
Iritis: presents with cells/flare, not frank blood
Globe rupture: presents with teardrop pupil and low IOP
Corneal abrasion: presents with foreign body sensation and positive fluorescein staining
Retinal detachment: presents with flashes/floaters and visual field loss