Branch Retinal Vein Occlusion (BRVO): Causes, Symptoms & Injection Treatment Protocol

A detailed explanation of Branch Retinal Vein Occlusion (BRVO), its impact on peripheral and central vision, and how to restore sight with Dr. Mahmoud Hassan at Mashreq Eye Center.

Branch Retinal Vein Occlusion (BRVO): Understanding the Condition and Modern Treatment Options

The retina, the light-sensitive tissue at the back of the eye, is the lifeline of our vision. When the delicate blood vessels supplying this retina encounter problems, vision can be significantly affected. Among these issues, Branch Retinal Vein Occlusion (BRVO) stands out as a condition requiring precise understanding and effective treatment to restore vision quality.

In this article, we will delve into the details of Branch Retinal Vein Occlusion, reviewing its causes, its distinctive symptoms, and how Dr. Mahmoud Hassan, a key contributor to Al Mashreq Eye Center in Cairo, manages this condition through advanced treatment protocols, particularly intravitreal injection therapy.

What is Branch Retinal Vein Occlusion (BRVO)?

Branch Retinal Vein Occlusion is a medical condition that occurs when one of the small branches of the veins that carry blood from the retina becomes blocked or thrombosed. This blockage obstructs the flow of venous blood from a specific part of the retina, leading to an accumulation of blood and fluid under or within the retina. This accumulation causes swelling (edema) in the macula, the area responsible for sharp central vision, thus negatively affecting vision clarity.

Unlike Central Retinal Vein Occlusion (CRVO), which affects the entire main vein, Branch Retinal Vein Occlusion affects a specific part of the retina, but if this branch supplies the macular area, the impact on vision can be severe.

Causes and Risk Factors Leading to Branch Retinal Vein Occlusion

The potential causes of Branch Retinal Vein Occlusion are numerous and often linked to chronic health conditions that affect blood vessels in general. Prominent among these causes and risk factors are:

• High Blood Pressure: Chronic high blood pressure is one of the most significant risk factors, as it leads to hardening and narrowing of blood vessels, making them more prone to occlusion.
• Diabetes: Diabetes affects the small blood vessels throughout the body, including the retina, increasing the risk of blood clots.
• High Cholesterol: Elevated cholesterol levels can contribute to the accumulation of fatty deposits within blood vessels, impeding blood flow.
• Cardiovascular Diseases: Any condition that generally affects heart and blood vessel health can increase the risk of retinal vein occlusion.
• Hypercoagulability: Certain inherited or acquired conditions that increase the blood's tendency to clot.
• Age: The likelihood of developing this condition increases with age, as blood vessels become less flexible.
• Retinal Vein Compression: Sometimes, occlusion can occur due to external compression on the retinal vein from an adjacent hardened artery.

It is important to note that understanding these factors helps in preventing the condition or managing it more effectively.

Common Symptoms of Branch Retinal Vein Occlusion

The onset of symptoms is often sudden and painless. The severity of symptoms depends on the location of the occlusion and its impact on the macular area. Key symptoms include:

• Blurry or Distorted Vision: The patient may notice a lack of clarity in part of the visual field or in central vision.
• Appearance of Dark Spots or Floaters: These may result from minor bleeding within the retina or vitreous body.
• Sudden Decrease in Visual Acuity: Especially if the occlusion directly affects the macula.
• Distortion of Straight Lines (Metamorphopsia): Straight lines may appear wavy or curved.
• Partial Loss of Peripheral Vision: In some cases, the visual field may be affected.

It is crucial to consult an ophthalmologist immediately upon noticing any of these symptoms for early diagnosis and necessary interventions.

Diagnosis of Branch Retinal Vein Occlusion

Accurate diagnosis of Branch Retinal Vein Occlusion relies on a comprehensive eye examination. It begins with an examination of the fundus using an ophthalmoscope to identify signs of occlusion, such as retinal hemorrhage, retinal swelling, and the appearance of abnormal new blood vessels.

For a more detailed view, advanced tests are utilized, such as:

• Optical Coherence Tomography (OCT): Provides high-resolution cross-sectional images of the retina, allowing for the assessment of swelling (edema) and the extent of affected retinal layers, especially the macula.
• Fundus Fluorescein Angiography (FFA): This test helps accurately locate the occlusion, assess blood flow in the retinal vessels, and detect any abnormal blood vessel growth (neovascularization) that could lead to serious complications.

Obtaining clear and accurate retinal images is vital for developing an effective treatment plan.

Intravitreal Injection Treatment Protocol

In many cases of branch retinal vein occlusion, especially when the occlusion affects the macula and causes edema, intravitreal injection therapy becomes the primary and most effective treatment option. This treatment aims to reduce swelling and restore vision.

Dr. Mahmoud Hassan, with his extensive experience in retinal surgeries, applies the latest intraocular injection protocols at Al Mashreq Eye Center. These protocols include the use of medications known as Anti-VEGF (vascular endothelial growth factor inhibitors), which work to reduce fluid leakage from damaged blood vessels and shrink retinal edema.

Types of Medications Used for Injections:

• Eylea Injections: Eylea (Aflibercept) is a highly effective medication for treating edema resulting from retinal vein occlusion. It works by binding to growth factors that stimulate the formation of abnormal blood vessels and increase their permeability.
• Vabysmo Injections: Vabysmo (Faricimab) is a newer medication that combines the mechanism of action of VEGF inhibitors with the mechanism of action of Ang-2 (angiopoietin-2) inhibitors, providing a dual target approach to reduce inflammation and edema. It is an advanced treatment option for certain cases.
• Other Medications: Other medications such as ranibizumab (Lucentis) or corticosteroid injections (e.g., Ozurdex) may be used in certain cases at the doctor's discretion.

Injection and Monitoring Protocol:

Treatment usually begins with an initial injection, followed by a series of injections at regular intervals (often monthly initially) depending on the patient's response. The response is evaluated through regular examinations including visual acuity measurement and fundus examination, as well as OCT scans to track changes in retinal thickness.

The number of injections required may vary from patient to patient, and depends on the severity of the condition and the extent of vision improvement. In some cases, the patient may need multiple eye injections to treat retinal vein occlusion and a follow-up protocol for a long period to ensure stable condition and prevent relapse.

Other Treatment Options

In some cases that do not respond adequately to injection therapy, or in the presence of complications such as the growth of new blood vessels that may lead to vitreous hemorrhage or elevated eye pressure (glaucoma), other treatments may be considered:

• Laser Treatment: Laser (such as argon laser) can be used to reduce the growth of abnormal blood vessels in the peripheral parts of the retina, which helps prevent bleeding or other complications. This procedure is known as panretinal photocoagulation.
• Surgery: In very rare and complex cases, surgery may be necessary, especially if there is severe vitreous hemorrhage or retinal detachment.

Living with Branch Retinal Vein Occlusion

Adherence to the treatment plan and regular follow-up with the ophthalmologist is crucial. In addition, controlling underlying risk factors such as blood pressure, diabetes, and cholesterol plays a pivotal role in preventing new occlusions or worsening of the condition.

Patients are advised to monitor any changes in vision and report them immediately. A healthy diet and regular exercise can also contribute to improving overall vascular health.

Conclusion

Branch retinal vein occlusion is a medical condition that requires special attention and care. Thanks to advances in diagnostic and treatment techniques, especially intravitreal injection therapy, excellent results can be achieved in restoring vision and reducing complications. Dr. Mahmoud Hassan and the team at Al Mashreq Eye Center are committed to providing the highest levels of care for retinal patients, relying on the latest scientific advancements in this field.

For more information about retinal diseases and their treatments, you can follow Dr. Mahmoud Hassan's YouTube channel.

For appointments and inquiries: 01002310813

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