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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.

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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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