Retinal vein occlusion (RVO) is a disease in which there is a disruption of blood flow in the central retinal vein or its branches, which can lead to edema, ischemia of the inner retinal layer and, as a result, to vision loss. This pathology can occur both in patients with predisposing factors and in individuals without an obvious history of cardiovascular diseases. The main mechanism of vein occlusion is associated with the formation of a thrombus in the venous system, which can be provoked by various factors, such as atherosclerosis, arterial hypertension, diabetic angiopathy and other systemic diseases. This condition can result in a noticeable deterioration in the quality of life, which makes timely diagnosis and treatment of this pathology extremely important.
History of the disease and interesting historical facts
The history of retinal vein occlusion research spans over a century. The first descriptions of diseases associated with retinal vein occlusion appeared at the turn of the 19th and 20th centuries, when physicians began recording clinical manifestations and results of fundus examinations. In the 1930s, classifications of RVO based on the characteristics of arterial and venous changes in the retina were first proposed. Research conducted in the 1940s became the basis for understanding the pathophysiology of occlusion and the impact of cardiovascular disease on ocular health. Interestingly, data on RVO have been used to change approaches to the treatment of other vascular diseases, demonstrating the integrative nature of medicine.
Epidemiology
According to various population studies, the prevalence of retinal vein occlusion varies by region and age group, but the overall incidence is 0.1% to 0.5% in the adult population. The incidence of RVO increases with age: among patients over 65 years old, it reaches 1-2%. In men, this disease is recorded slightly more often than in women, which may be due to differences in the structural and functional aspects of the cardiovascular system. There is evidence that branch vein occlusion is more common than central retinal vein occlusion: in the case of branch RVO, the incidence is up to 4% in the older age category.
Genetic predisposition to this disease
The role of genetic predisposition to retinal vein occlusion is currently being investigated. It is assumed that various genetic mutations associated with hemostasis disorders may increase the risk of thrombosis. It has been established that some polymorphisms in the factor V Leiden, prothrombin, and fibrinogen genes may increase the likelihood of developing the disease. Initial data on the potential role of genes associated with inflammation and lipid metabolism have also been identified. It is important to note that research in this area is still ongoing, and larger samples are needed to confirm or refute these findings.
Risk factors for the development of this disease
Retinal vein occlusion is associated with multiple risk factors, which can be divided into systemic and local. Systemic factors include:
- Arterial hypertension
- Diabetes mellitus
- Hyperlipidemia
- Age over 65 years
- Hemostasis and thrombophilia
Local risk factors include:
- Anatomical features of the venous network
- Eye injuries
- Eye pathologies such as glaucoma or retinopathy
The importance of lifestyle, including low physical activity and smoking, can also be noted, as they may increase the predisposition to occlusion.
Diagnosis of this disease
Diagnosis of retinal vein occlusion requires a thorough approach and involves several steps. The main symptoms of RVO may include:
- Sudden loss of vision in one eye
- The presence of dark spots or "rattle flies" in front of the eye
- Distortion of the shape of objects (metamorphopsia)
Laboratory tests may include glucose levels, lipid profile, coagulation profile, and genetic tests for thrombophilia.
Radiological examinations such as fluorescein angiography help visualize vascular changes and the degree of ischemia. Other diagnostics may include optical coherence tomography, which allows assessing the condition of the retina and the presence of edema. Differential diagnosis must be made with other pathologies such as diabetic retinopathy, venous thrombosis, and even retinal tumors.
Treatment
Treatment of retinal vein occlusion depends on the clinical situation, the degree of ischemia, and the presence of concomitant diseases. General treatment is aimed at correcting risk factors, such as controlling hypertension and diabetes. Pharmacological treatment includes the use of anticoagulants, thrombolytics, and drugs that improve microcirculation.
Surgical treatment may be used in the presence of significant edema or to restore venous outflow. In recent years, anti-VEGF injections (IngeA-VEGF) have been developed to help reduce retinal edema. Other methods, such as laser coagulation, may also be used to prevent the development of neovascularization.
List of medications used to treat this disease
The main medications used for retinal vein occlusion include:
- Aspirin
- Clopidogrel
- warfarin
- Rivaroxaban
- Bevacizumab
- ranibizumab
- Aflibercept
These drugs are used both to prevent blood clots and to treat severe manifestations of the disease.
Disease monitoring
Monitoring the patient's condition after diagnosis of retinal vein occlusion is critical. The control stages should regularly assess visual acuity, conduct angiographic studies and monitor the state of concomitant diseases. The prognosis in case of adequate treatment depends on the degree of ischemia and the presence of concomitant changes in the retina. Possible complications of RVO may include neovascularization, glaucoma, which requires surgical intervention.
Age-related features of the disease
Retinal vein occlusion is more common in older age groups, as chronic diseases such as hypertension and diabetes increase with age. In younger patients, RVO may be associated with congenital or acquired thrombophilia. At a younger age, the disease may be less severe, but the risk of developing severe complications remains.
Questions and Answers
- What are the main symptoms of retinal vein occlusion? The main symptoms include sudden deterioration of vision, the appearance of dark spots and distortion of the shape of objects.
- How is retinal vein occlusion diagnosed? Diagnosis is based on examination of the fundus, angiography and other visualization methods.
- What is the treatment for retinal vein occlusion? Treatment may include medication, anti-VEGF injections, and, in rare cases, surgery.
- What are the risk factors for retinal vein occlusion? Risk factors include hypertension, diabetes, obesity and age over 65 years.
- Are there genetic factors that influence the risk of retinal vein occlusion? Yes, some genetic predispositions may increase the risk, especially in relation to impaired hemostasis.
