Löhlein Focal Nephritis – Causes, Symptoms and Treatment
Löhlein focal nephritis is a focal, bacterially embolic inflammation of the kidney, typically occurring as a complication of bacterial endocarditis.
Things worth knowing about "Löhlein Focal Nephritis"
Löhlein focal nephritis is a focal, bacterially embolic inflammation of the kidney, typically occurring as a complication of bacterial endocarditis.
What is Löhlein Focal Nephritis?
Löhlein focal nephritis is a focal, non-suppurative inflammation of the kidney caused by septic microemboli (small infected blood clots) that reach the renal vasculature via the bloodstream. It occurs classically as a complication of bacterial endocarditis, an infection of the inner lining of the heart. The condition is named after the German pathologist Max Hermann Friedrich Löhlein, who first described it in the early 20th century. The disease is characterized by focal inflammatory lesions within kidney tissue, caused by lodged bacteria or immune complex deposition.
Causes
The primary cause of Löhlein focal nephritis is infective endocarditis. Infected thrombi detach from heart valves and travel through the bloodstream to the renal vessels. Contributing factors include:
- Bacterial endocarditis, frequently caused by Streptococcus viridans, Staphylococcus aureus, or enterococci
- Pre-existing heart valve defects
- Immunocompromised states (e.g., post-transplantation)
- Intravenous drug use as a risk factor for endocarditis
- Deposition of immune complexes in the glomeruli (kidney filtering units)
Pathomechanism
Two major mechanisms lead to renal injury in this condition:
- Embolic-septic mechanism: Infected microemboli occlude small renal arteries and cause focal inflammatory lesions or microabscesses in kidney tissue.
- Immunological mechanism: Circulating immune complexes deposit in the glomeruli, triggering a local inflammatory response. This pathway resembles focal proliferative glomerulonephritis.
Symptoms
The clinical presentation of Löhlein focal nephritis is variable and is often overshadowed by the symptoms of the underlying endocarditis. Typical features include:
- Hematuria (blood in the urine, visible or microscopic)
- Proteinuria (protein in the urine)
- Flank pain in the kidney area
- Fever and general malaise (as part of the endocarditis)
- In severe cases: reduced kidney function or acute kidney injury
Diagnosis
Diagnosis is established in the clinical context of known or suspected endocarditis. The following investigations are used:
- Urinalysis: Detection of red blood cells, casts, and protein in the urine
- Blood tests: Elevated inflammatory markers (CRP, ESR), renal function parameters (creatinine, urea), and blood cultures for pathogen identification
- Echocardiography: Detection of valvular vegetations as the embolic source
- Kidney biopsy: The gold standard for histological confirmation; reveals focal inflammatory lesions, immune complex deposits, and occasionally necrotic areas
- Imaging: Renal ultrasound or CT scan to identify infarction zones or abscesses
Treatment
Treatment of Löhlein focal nephritis primarily targets the underlying condition, namely infective endocarditis:
- Antibiotics: Prolonged high-dose intravenous antibiotic therapy based on the identified pathogen (e.g., penicillin, oxacillin, vancomycin) for 4 to 6 weeks
- Cardiac surgery: Valve replacement surgery may be required in cases of severe valve destruction or persistent infection
- Nephrological monitoring: Close surveillance of renal function; renal replacement therapy (dialysis) may be needed in severe kidney failure
- Immunosuppression: In pronounced immune-mediated forms, immunosuppressive therapy may be considered in select cases
Prognosis
The prognosis of Löhlein focal nephritis is closely linked to the course of endocarditis. With early diagnosis and effective antibiotic treatment, renal function can fully recover. Delayed therapy or extensive renal infarction carries the risk of permanent kidney damage or chronic renal insufficiency.
References
- Kasper DL et al. - Harrison's Principles of Internal Medicine, 21st edition, McGraw-Hill Education, 2022.
- Habib G et al. - 2015 ESC Guidelines for the management of infective endocarditis. European Heart Journal. 2015;36(44):3075-3128.
- Jennette JC, Olson JL, Silva FG, D'Agati VD - Heptinstall's Pathology of the Kidney, 7th edition, Wolters Kluwer, 2015.
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