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Hypertensive Retinopathy

By

Sonia Mehta

, MD, Vitreoretinal Diseases and Surgery Service, Wills Eye Hospital, Sidney Kimmel Medical College at Thomas Jefferson University

Last full review/revision Jun 2020| Content last modified Jun 2020
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Hypertensive retinopathy is retinal vascular damage caused by hypertension. Signs usually develop late in the disease. Funduscopic examination shows arteriolar constriction, arteriovenous nicking, vascular wall changes, flame-shaped hemorrhages, cotton-wool spots, yellow hard exudates, and optic disk edema. Treatment is directed at controlling blood pressure and, when vision loss occurs, treating the retina.

Pathophysiology of Hypertensive Retinopathy

Acute blood pressure elevation typically causes reversible vasoconstriction in retinal blood vessels, and hypertensive crisis may cause optic disk edema. More prolonged or severe hypertension leads to exudative vascular changes, a consequence of endothelial damage and necrosis. Other changes (eg, arteriole wall thickening, arteriovenous nicking) typically require years of elevated blood pressure to develop. Smoking compounds the adverse effects of hypertensive retinopathy.

Symptoms and Signs of Hypertensive Retinopathy

Symptoms usually do not develop until late in the disease and include blurred vision or visual field defects.

In the early stages, funduscopy identifies arteriolar constriction, with a decrease in the ratio of the width of the retinal arterioles to the retinal venules.

Chronic, poorly controlled hypertension causes the following:

  • Permanent arterial narrowing

  • Arteriovenous crossing abnormalities (arteriovenous nicking)

  • Arteriosclerosis with moderate vascular wall changes (copper wiring) to more severe vascular wall hyperplasia and thickening (silver wiring)

Sometimes total vascular occlusion occurs. Arteriovenous nicking is a major predisposing factor to the development of a branch retinal vein occlusion.

If acute disease is severe, the following can develop:

  • Superficial flame-shaped hemorrhages

  • Small, white, superficial foci of retinal ischemia (cotton-wool spots)

  • Yellow hard exudates

  • Optic disk edema

Hypertensive Retinopathy

Yellow hard exudates represent intraretinal lipid deposition from leaking retinal vessels. These exudates can develop a star shape within the macula, particularly when hypertension is severe. In severe hypertension, the optic disk becomes congested and edematous (papilledema indicating hypertensive crisis Hypertensive Emergencies A hypertensive emergency is severe hypertension with signs of damage to target organs (primarily the brain, cardiovascular system, and kidneys). Diagnosis is by blood pressure (BP) measurement... read more ).

Diagnosis of Hypertensive Retinopathy

Diagnosis is by history (duration and severity of hypertension) and funduscopy.

Treatment of Hypertensive Retinopathy

Hypertensive retinopathy is managed primarily by controlling hypertension. Other vision-threatening conditions should also be aggressively controlled. If vision loss occurs, treatment of the retinal edema with laser or with intravitreal injection of corticosteroids or antivascular endothelial growth factor drugs (eg, ranibizumab, pegaptanib, bevacizumab) may be useful.

Key Points

  • Chronic hypertension progressively damages the retina, causing few or no symptoms until changes are advanced.

  • Chronic hypertensive retinopathy is recognized by permanent arterial narrowing, arteriovenous crossing abnormalities (arteriovenous nicking), arteriosclerosis with moderate vascular wall changes (copper wiring), or more severe vascular wall hyperplasia and thickening (silver wiring).

  • Hypertensive crisis can cause retinopathy with superficial flame-shaped hemorrhages; small, white, superficial foci of retinal ischemia (cotton-wool spots); yellow hard exudates; and optic disk edema.

  • Diagnose patients by history and funduscopy.

  • Treat primarily by controlling blood pressure, and, for retinal edema, sometimes laser or intravitreal injection of corticosteroids or antivascular endothelial growth factor drugs.

Drugs Mentioned In This Article

Drug Name Select Trade
AVASTIN
LUCENTIS
MACUGEN
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