Focal segmental glomerulosclerosis (FSGS) is a disease characterized by the destruction and sclerosis of individual segments of the glomeruli of the kidneys. This pathological condition impairs the filtration function of the kidneys and leads to gradual progression of renal failure. As a result of glomerular damage, proteinuria is observed, which can vary from moderate to severe, as well as edema, hypertension, and interruption of normal carbohydrate and lipid metabolism. FSGS can be primary or secondary, depending on the presence or absence of various systemic diseases, infections, or allergens in the background of another disease. Despite constant medical advances, the pathogenesis of FSGS is still the subject of active research.
History of the disease and interesting historical facts
Focal segmental glomerulosclerosis was first described in 1932 by Shidlovsky and colleagues, but it became widely known only in the 1980s, when more accurate methods of diagnosis and examination emerged. At that time, doctors began to pay more attention to observations about the progressive nature of the disease. Over the past few decades, significant progress in understanding the mechanism of the disease has been achieved due to the development of molecular genetics and biology.
Epidemiology
FSGS occurs in different populations with varying frequencies. Epidemiological studies have reported prevalence rates of 7 to 25% among patients with primary nephropathy. The American Kidney Association reports that FSGS is one of the most common kidney diseases requiring transplantation. The disease is most commonly seen in children and young adults, making it an important issue for pediatric nephrology.
Genetic predisposition to this disease
It has been shown that FSGS can be caused by both genetic and acquired factors. Several key genes associated with the disease have now been identified, including PODXL, NPHS2, and ACTN4, which affect podocyte function. Mutations in these genes lead to disruption of the structural integrity of the glomeruli and contribute to the development of sclerosis. Genetic predisposition is particularly characteristic of familial cases of the disease, as well as in certain ethnic groups, such as African Americans, which emphasizes the role of genetic factors in the pathogenesis of FSGS.
Risk factors for the development of this disease
Among the risk factors that contribute to the development of FSGS are:
- Infectious diseases such as HIV and hepatitis C.
- Autoimmune diseases such as systemic lupus erythematosus.
- Taking certain medications, such as nonsteroidal anti-inflammatory drugs.
- Habit of alcohol and drug use.
- Obesity and metabolic syndrome, which can put increased stress on the kidneys.
These factors can contribute to the initial development of the disease and aggravate the course of the existing process.
Diagnosis of this disease
Diagnosis of FSGS involves several stages and various research methods. The main symptoms include:
- Proteinuria (eg, more than 3.5 g/day).
- Swelling, especially in the legs, eyes and thighs.
- Increased blood pressure.
- The appearance of blood in the urine.
Laboratory tests, such as urine microscopy and blood creatinine levels, can reveal characteristic changes. Radiological examinations, such as ultrasound, can provide information about the size and condition of the kidneys. The most important final diagnostic step is a kidney biopsy, which allows us to establish the nature of the sclerotic changes and confirm the diagnosis. Differential diagnostics are necessary to exclude other causes of proteinuria and renal failure, such as diabetic nephropathy and glomerulonephritis.
Treatment
Treatment of FSGS requires a comprehensive approach and may include:
- General treatment focuses on dietary control, salt and fluid restriction.
- Pharmacological treatment including corticosteroids, immunosuppressants and antihypertensive drugs.
- Surgical treatment - in extreme cases, when a kidney transplant is necessary.
- Other methods, such as plasmapheresis, may be considered for cases caused by infections or toxic agents.
List of medications used to treat this disease
The main drugs used to treat FSGS are:
- Prednisolone and other steroids.
- Cyclosporine and tacrolimus (immunosuppressants).
- Angiotensin-converting enzyme (ACE) inhibitors and angiotensin II antagonists.
- Medicines aimed at controlling cholesterol levels and other metabolic disorders (statins).
Disease monitoring
Monitoring of FSGS includes regular blood pressure monitoring, urine protein levels, and blood creatinine tests. The prognosis of the disease varies. Some patients may progress to chronic renal failure, while others may achieve remission with proper treatment. Possible complications include organ deprivation of oxygen, infections that occur with long-term use of immunosuppressants, and deterioration of kidney function.
Age-related features of the disease
FSGS can be observed at any age, but shows different clinical manifestations and course depending on the age group:
- Children are more likely to have primary FSGS, which has a better chance of full recovery with early treatment.
- In young people, the disease may progress more aggressively and require more intensive monitoring.
- In older people, the disease is often accompanied by comorbidities and may be more resistant to traditional treatment.
Questions and Answers
- What are the main symptoms of focal segmental glomerulosclerosis? The main symptoms include proteinuria, swelling, high blood pressure and blood in the urine.
- What are the most common diagnostic methods? The key diagnostic methods are urine and blood tests, ultrasound diagnostics and kidney biopsy.
- How is the disease treated? Treatment may include corticosteroids, immunosuppressants, and blood pressure control.
- What is the prognosis for patients with FSGS? The prognosis varies: some patients may make a full recovery, while others may require a kidney transplant.
- What factors can aggravate the course of the disease? Factors that aggravate the course of the disease include infectious diseases, alcohol abuse and the presence of other diseases.
Advice from Dr. Oleg Korzhikov
If you or someone you love is suspected of having FSGS, it is extremely important to have a complete medical examination. I strongly recommend the following:
- Timely visit to the doctor. The sooner the diagnosis is made, the greater the chances for successful treatment.
- Monitor your blood pressure and urine protein levels—these are key indicators of kidney health.
- A balanced diet and avoiding bad habits will help relieve symptoms and slow the progression of the disease.
- Visit your doctor regularly to monitor your condition and adjust your treatment.
Stay positive and pay attention to your body's signals.
