N06.5

Clinical Causes: Autoimmune diseases, such as systemic lupus erythematosus Chronic infections like hepatitis C or hepatitis B Monoclonal gammopathies or other abnormal immune responses Genetic predispositions affecting immune regulation Environmental factors and exposure to nephrotoxic substances

Key Symptoms: Persistent proteinuria detected through urine tests Swelling or edema, especially in the legs and ankles High blood pressure Fatigue and weakness Foamy or dark-colored urine Possible signs of kidney impairment, such as decreased urine output

Diagnosis Path: Diagnosing this condition involves a combination of laboratory tests, imaging, and sometimes kidney biopsy. Key steps include: - Urinalysis to detect proteinuria and other abnormalities - Blood tests to evaluate kidney function, including serum creatinine and estimated glomerular filtration rate (eGFR) - Serologic tests for underlying autoimmune or infectious causes - Kidney biopsy to examine tissue histology and confirm the presence of mesangiocapillary glomerulonephritis, Types 1 and 3 The biopsy also helps distinguish this condition from other forms of glomerulonephritis and guide treatment options.

Treatment Protocols: Treatment strategies aim to control symptoms, reduce immune activity, and prevent disease progression. Typical approaches include: - Blood pressure management using antihypertensive medications, especially those that protect kidney function like ACE inhibitors or ARBs - Immunosuppressive therapy in cases with an autoimmune component - Addressing underlying infections with appropriate antiviral or antimicrobial treatments - Lifestyle modifications, such as dietary changes to reduce salt intake and maintain healthy blood pressure - Regular monitoring of urine protein levels, kidney function tests, and blood pressure to assess disease progression In some cases, more advanced treatments like plasmapheresis or dialysis may be required if kidney function declines significantly.