Hypertensive angiopathy: what it is and how it manifests itself

Hypertensive retinal angiopathy is a collection of changes in the retinal vessels that occur against a background of elevated blood pressure and reflect damage to target organs. The most typical findings include arteriolar narrowing, arteriovenous nicks, hemorrhages, cotton wool spots, and hard exudates. In malignant hypertension, optic disc edema and a stellate pattern of exudates in the macula are also observed. These signs not only affect vision but also correlate with the overall vascular risk of stroke and cardiovascular events. The basis of treatment is controlled reduction of blood pressure and correction of risk factors. [1]

The Keith-Wagener-Barker and Shea scales are traditionally used to describe the severity of changes. However, their prognostic value and reproducibility are limited. Therefore, in modern practice, the emphasis is on the presence of moderate to severe retinopathy as a sign of target organ damage. It is important for physicians to recognize ominous signs, especially papilledema and multiple hemorrhages, which require emergency hospitalization as a hypertensive crisis with target organ damage. [2]

Modern imaging techniques, including optical coherence tomography and optical coherence tomography angiography, allow for quantitative assessment of microcirculation, vascular plexus density, and macular edema. These technologies expand the diagnostic capabilities of hypertensive retinopathy, particularly in malignant cases, and help monitor the effects of therapy. [3]

In the body, retinal changes reflect a systemic process. Therefore, any detection of moderate or severe hypertensive retinopathy is a reason to reconsider the hypertension management strategy in accordance with current European and American guidelines, with mandatory use of out-of-office monitoring to confirm the diagnosis and assess the effectiveness of treatment. [4]

Epidemiology

The prevalence of arterial hypertension in Europe reaches 30-45 percent and increases with age, so hypertensive retinal angiopathy remains a common finding among physicians and ophthalmologists. Most patients exhibit mild vascular changes, but some develop moderate to severe retinopathy, associated with an increased risk of stroke and cardiovascular events. [5]

Detectability of retinopathy signs depends on the technique used. Direct ophthalmoscopy is less sensitive than fundus photography and quantitative image analysis. The use of optical coherence tomography and optical coherence tomography angiography improves the detection of microcirculatory disorders, especially in the deep vascular plexuses. [6]

Malignant hypertension with severe retinochoroidopathy is much less common but carries a high risk of acute vision loss and systemic complications. Patients often complain of headaches, visual disturbances, and eye pain; changes in the fundus are associated with kidney and brain damage. [7]

The presence of moderate to severe retinopathy is considered target organ damage in current hypertension guidelines. This fact influences risk stratification and treatment targets, strengthening the indications for combination antihypertensive therapy and intensive risk factor correction. [8]

Reasons

Hypertensive angiopathy is characterized by prolonged elevation of blood pressure, which causes functional spasm of arterioles, vascular wall remodeling, and hyalinosis. In the early stages, reversible narrowing of arterioles predominates; later, structural changes with wall thickening and lumen narrowing occur, which increases retinal tissue ischemia. [9]

Acute severe hypertension and hypertensive crisis with target organ damage lead to disruption of the blood-retinal barrier, plasmarrhea, lipid deposition as hard exudates, and the formation of "cotton wool" lesions as markers of nerve fiber layer ischemia. Optical coherence tomography demonstrates nerve fiber layer edema and macular involvement. [10]

In malignant hypertension, in addition to retinopathy, choroidopathy develops with the formation of Elschnig spots and Siegrist bands due to necrosis of choroidal arterioles and ischemia of the retinal pigment epithelium. These findings are particularly characteristic of young patients with a rapid rise in pressure and require intensive systemic treatment. [11]

Retinal microvascular changes are considered a "window" to systemic vascular health and are associated with an increased risk of stroke, coronary events, and mortality. Therefore, ophthalmologic findings are important not only for vision but also for life prognosis. [12]

Risk factors

The main risk factors are long-standing arterial hypertension, older age, male gender, smoking, dyslipidemia, and diabetes mellitus. The combination of metabolic disorders increases microvascular damage, accelerating the development of moderate to severe retinopathy and increasing the risk of systemic complications. [13]

Kidney damage, increased albuminuria, and decreased glomerular filtration rate are associated with the severity of retinopathy. These relationships reflect the overall microcirculatory damage to target organs and explain the need for a multidisciplinary approach involving a physician and a nephrologist. [14]

Poor adherence to therapy, irregular blood pressure monitoring, and lack of home monitoring increase the likelihood of hypertensive crises and retinopathy progression. Current guidelines emphasize the need for out-of-office measurements and 24-hour monitoring to optimize treatment. [15]

In young patients, the sudden development of severe retinochoroidopathy is often associated with malignant hypertension, pheochromocytoma, preeclampsia, or secondary forms of hypertension. In these cases, extensive diagnostic workup for the causes of secondary hypertension and emergency treatment are required. [16]

Pathogenesis

In the early stages, functional changes in arteriolar tone predominate, caused by endothelial dysfunction and increased vascular resistance. This leads to generalized and focal narrowing of arterioles and arteriovenous crossings, reflecting mechanical compression of venules by compacted arterioles. [17]

Ischemia of the retinal nerve layer manifests as "cotton wool" lesions—micronecrosis of the nerve fiber layer against a background of occlusion of precapillary arterioles. Disruption of the blood-retinal barrier causes lipid exudation and the formation of yellow, hard exudates; in malignant hypertension, a "macular star" is formed. [18]

Optical coherence tomography and optical coherence tomography angiography demonstrate reduction in deep vascular plexus capillaries, decreased perfusion density, and macular edema. These metrics correlate with hypertension severity and dynamically improve with effective blood pressure reduction. [19]

Chronic arterial hypertension leads to hyalinosis and arteriolar remodeling, which reduces the reversibility of changes and increases the risk of retinal vein thrombosis and ischemic optic neuropathy. Timely correction of blood pressure can prevent irreversible damage. [20]

Symptoms

Mild hypertensive retinopathy is often asymptomatic and is detected during routine fundus examination. As the condition progresses, complaints of decreased visual acuity, blurred vision, photophobia, and difficulty reading may develop, especially when the macula is involved. [21]

Malignant hypertension can cause acute symptoms, including headache, eye pain, rapid deterioration of vision, and sometimes double vision. These manifestations require immediate evaluation and hospitalization, as they reflect target organ damage and a high risk of systemic complications. [22]

Sometimes the first manifestations are scotomas due to hemorrhages and "cotton wool" spots in the macula, as well as metamorphopsia due to exudative lesions. With prolonged progression, patients may notice a gradual decline in vision due to chronic ischemia and macular changes. [23]

Some patients present with complications such as branch or central retinal vein thrombosis, which is accompanied by sudden visual impairment. Although this complication is multifactorial, uncontrolled hypertension significantly increases the risk. [24]

Forms and stages

Hypertensive retinopathy is classified as mild, moderate, and severe, based on the number and severity of hemorrhages, cotton-wool lesions, hard exudates, and the presence of optic disc edema. The transition to moderate and severe degrees is considered to be of practical significance as a marker of target organ damage. [25]

The classic Keith-Wagener-Barker classification includes four grades, ranging from functional arteriolar stenosis to papilledema. Despite its historical significance, reproducibility is low, and distinguishing between grades 1 and 2 is difficult, so a number of authors propose simplified schemes. [26]

In addition to retinopathy, hypertensive choroidopathy and hypertensive optic neuropathy are described as parts of a single spectrum. Choroidopathy manifests as Elschnig spots and Siegrist stripes and is more common in young patients with a malignant course. [27]

Instrumental methods allow for a quantitative assessment of severity: optical coherence tomography-angiography data are used to measure the density of vascular plexuses and the area of avascular zones, which increases the objectivity of staging and is suitable for dynamic monitoring. [28]

Complications and consequences

Short-term consequences include decreased visual acuity due to macular edema and exudates, as well as the risk of acute hemorrhages. In malignant hypertension, rapid vision loss is possible due to papilledema and severe ischemia. [29]

Long-term consequences are associated with vascular remodeling and chronic ischemia, which increases the risk of retinal vein thrombosis and ischemic optic neuropathy. Even with stabilization of blood pressure, residual structural changes may persist, affecting vision. [30]

Hypertensive retinopathy is a predictor of systemic events: the presence of moderate to severe fundus signs correlates with the risk of stroke, vascular dementia, and cardiovascular mortality. Therefore, detection of these signs requires a revision of prevention strategies. [31]

In isolated cases of severe exudative processes, the benefit of intravitreal injection of anti-vascular endothelial growth factor has been reported as an adjunct to strict blood pressure control; however, the primary effect is achieved with systemic antihypertensive therapy. The decision regarding ophthalmic injections is made by a specialist on an individual basis. [32]

Diagnostics

Clinical diagnosis begins with ophthalmoscopy and fundus photography during miosis or after medicinally dilated pupils. The caliber of arterioles and venules, arteriovenous crossings, the presence of hemorrhages, cotton wool spots, hard exudates, and the condition of the optic disc are assessed. [33]

Optical coherence tomography is useful for assessing macular edema and nerve fiber layer; optical coherence tomography angiography is useful for quantifying capillary plexus density and ischemic areas. Fluorescein angiography is used selectively to confirm leakage and assess perfusion. [34]

Systemic assessment includes confirmation of the diagnosis of arterial hypertension according to modern criteria using home and daily monitoring, as well as screening for target organ damage: urine analysis for albuminuria, biochemical markers of kidney function, electrocardiogram and echocardiography. [35]

If secondary forms of hypertension, malignant course, young age or pregnancy are suspected, an extended diagnosis of the causes is carried out and the patient is hospitalized in the presence of damage to target organs, including retinopathy with optic disc edema. [36]

Differential diagnosis

Differentiate from diabetic retinopathy, where microaneurysms, multiple punctate hemorrhages, and neovascularization during the proliferative process are more characteristic. The absence of hyperglycemia and the predominance of arteriovenous crossings and generalized narrowing of arterioles suggest hypertensive retinopathy. [37]

Retinal vein occlusions, which produce significant hemorrhages and macular edema, should be considered. The presence of risk factors for venous thrombosis and the characteristic distribution of changes help differentiate this condition, although hypertension is an important general risk factor. [38]

Oculo-ischemic syndrome in internal carotid artery stenosis can mimic chronic retinal ischemia. Carotid Doppler ultrasonography and systemic vascular assessment help exclude this condition.[39]

Hypertensive choroidopathy sometimes resembles central serous chorioretinopathy in the presence of subretinal fluid and punctate hyperfluorescent foci. The context of malignant hypertension, systemic symptoms, and characteristic fundus findings are important. [40]

Treatment

The primary goal is a controlled and sustained reduction in blood pressure to target values in accordance with current guidelines, with priority given to combination therapy and regular out-of-office monitoring. Improvement in ophthalmologic signs usually follows normalization of blood pressure over weeks and months. Antihypertensive therapy is prescribed by a physician or cardiologist, taking into account comorbidities. [41]

In hypertensive crises with target organ damage and ophthalmoscopic signs of severe retinopathy, hospitalization and intravenous titratable blood pressure reduction with short-acting drugs under close monitoring are required. After stabilization, the patient is transferred to oral regimens with close monitoring and risk factor control. [42]

Ophthalmological treatment is aimed at managing complications. In cases of severe macular edema and exudative changes, an additional effect of intravitreal anti-vascular endothelial growth factor has been described, but it is considered an adjunct to mandatory systemic blood pressure monitoring and correction of metabolic disorders. The decision is made on an individual basis after excluding other causes of macular edema. [43]

Modern imaging technologies serve as a tool for monitoring response to therapy. Optical coherence tomography angiography data allows for quantitative tracking of capillary perfusion restoration and reduction in ischemic areas, supporting more accurate risk stratification and personalized treatment. [44]

Table 1. Key clinical features of hypertensive retinopathy

Sign	Brief description	Clinical significance
Narrowing of arterioles	Generalized or focal	An early and often reversible sign
Arteriovenous crossings	Compression of venules by compacted arterioles	Marker of long-term remodeling
Hemorrhages	Flame-like and point-like	Evidence of acute or subacute vascular injury
"Cotton" foci	Nerve fiber layer ischemia	Risk of acute loss of function
Hard exudates	Lipid deposition	Often form a "macular star"
Disc edema	A sign of malignant hypertension	Requires emergency treatment

Source: clinical reviews. [45]

Table 2. Keith-Wagener-Barker classification and practical comments

Degree	Main features	Practical value
1	Narrowing of arterioles	Limited reproducibility
2	Narrowing and arteriovenous crossings	Moderate retinopathy
3	Hemorrhages, cotton wool lesions, exudates	Target organ damage
4	Disc edema	Emergency condition

Comment: In real practice, the presence of moderate and severe retinopathy is assessed as a marker of target organ damage. [46]

Table 3. Instrumental diagnostics

Method	What does it show?	When needed
Photograph of the fundus of the eye	Documentation and dynamics of signs	All patients with suspected
Optical coherence tomography	Macular edema, nerve fiber layer	For decreased vision and for monitoring
Optical coherence tomography angiography	Choroid plexus density, ischemia	For moderate to severe retinopathy
Fluorescein angiography	Leakage, perfusion	Selectively according to indications

Based on modern research. [47]

Table 4. Situations requiring emergency hospitalization

Situation	Why is it urgent?
Papilledema	A sign of malignant hypertension
Rapid vision loss with macular "star"	Severe macular damage
Neurological symptoms, chest pain, oliguria	Target organ damage
Pregnancy with preeclampsia	Maternal and fetal risk

Based on clinical guidelines and reviews.[48]

Table 5. Systemic treatment for hypertensive crisis with target organ damage

Stage	Approach
Start	Hospitalization, monitoring
Medicines	Short-acting intravenous titratable agents
Target	Controlled reduction of blood pressure while avoiding hypoperfusion
Transition	Oral regimens after stabilization, close monitoring

According to clinical reviews and practical recommendations. [49]

Table 6. Role of ophthalmological interventions

Situation	Intervention	Comment
Severe macular edema with strict blood pressure control	Intravitreal anti-vascular endothelial growth factor	Consider individually as a supplement
Persistent exudation	Local therapy as determined by a specialist	If other causes are excluded
No complications	Observation	Systematic blood pressure monitoring is sufficient.

Based on reviews and case series.[50]

Table 7. Systemic stratification and monitoring

Component	What to do	For what
Off-site measurements	Home control, daily monitoring	Accurate control assessment
Target organ screening	Kidneys, heart, brain	Comprehensive prevention
Re-visualization	Fundus photography, optical coherence tomography	Monitoring the dynamics and effect of therapy

According to modern recommendations. [51]

Prevention

Primary prevention involves early detection of hypertension, regular out-of-office monitoring, lifestyle modification, and timely initiation of combination antihypertensive therapy. Controlling smoking, body weight, diet, physical activity, and lipid profile reduces the risk of developing moderate to severe retinopathy. [52]

Secondary prevention after detection of retinopathy includes achieving target blood pressure values, correcting associated disorders, and regular ophthalmologic imaging to document regression of signs. The use of optical coherence tomography and optical coherence tomography angiography helps to objectively monitor the restoration of microcirculation. [53]

Forecast

With strict blood pressure control, mild and some moderate fundus changes tend to regress within 6-12 months, and the risk of acute vision loss is low. The prognosis worsens with persistent uncontrolled hypertension, the presence of macular edema, and associated risk factors. [54]

Malignant hypertension with papilledema carries a high risk of permanent vision loss and systemic events, but with rapid hospitalization and controlled reduction of blood pressure, visual and ophthalmoscopic changes often regress. The prognosis is determined by the effectiveness of long-term antihypertensive therapy and control of risk factors. [55]

FAQ

• Should eyes be treated if vascular changes are found in the fundus, but vision is normal?

The primary treatment method is systemic blood pressure monitoring according to current recommendations. Specific ophthalmological interventions are required only in the case of complications, such as severe macular edema, and are decided on an individual basis. [56]

• How long will it take for changes in the fundus to disappear after pressure normalizes?

Mild signs often regress within 6-12 months, whereas structural changes in long-term hypertension may persist longer. It is important to document the dynamics with fundus photography and optical coherence tomography. [57]

• Are cotton wool lesions and hard exudates dangerous?

Yes, they indicate ischemia and barrier disruption, are consistent with moderate to severe retinopathy and are considered as target organ damage requiring intensification of therapy and systemic risk assessment. [58]

• When is hospitalization necessary?

For signs of malignant hypertension, including papilledema, rapid deterioration of vision, severe headache, and other symptoms of target organ damage, treatment involves controlled intravenous blood pressure reduction. [59]

• Is there any point in modern "retinal" measurements without complaints?

Optical coherence tomography and optical coherence tomography-angiography allow the detection of early microcirculatory changes and serve as an objective marker of the effectiveness of therapy, but the decision on their use is made by the physician based on the clinical picture. [60]