Infection-Related Glomerulonephritis

Obtain serum creatinine, electrolytes, albumin, complete blood count, C-reactive protein, urinalysis with microscopy, and quantitative proteinuria at presentation. Use a fresh urine specimen for sediment examination because storage damages erythrocytes; red-cell casts, dysmorphic erythrocytes, and proteinuria exceeding 500 mg/day favor glomerular bleeding. ScienceDirectScienceDirectLeukocyturia - an overview | ScienceDirect Topics

Treat red-cell casts plus a rising serum creatinine as a crescentic glomerulonephritis warning pattern requiring expedited nephrology involvement and kidney biopsy planning. Acute nephritic syndrome or rapidly progressive glomerulonephritis is particularly associated with infection-related GN, ANCA-associated vasculitis, and anti-GBM disease, so infection cannot be presumed to be the sole explanation. ScienceDirect+1ScienceDirectAcute glomerulonephritis - ScienceDirectScienceDirectLeukocyturia - an overview | ScienceDirect Topics

Perform a directed examination for active infection and systemic mimics: fever, cardiac murmur or embolic findings, infected skin or wound lesions, indwelling hardware, pulmonary symptoms, purpura, arthralgia, neuropathy, and upper-airway disease. Skin and other organ-system findings help distinguish kidney-limited disease from systemic glomerular disorders. ScienceDirect+1ScienceDirectMembranoproliferative Glomerulonephritis - an overviewScienceDirectLeukocyturia - an overview | ScienceDirect Topics

Poststreptococcal GN classically follows rather than accompanies infection, with a latency after apparent clinical recovery. In contrast, infection-related GN in adults commonly accompanies active infection, and staphylococcal infection is a leading adult trigger. Infection-related GN can follow bacterial, viral, or parasitic infections. Wiley+2WileyThe Influence and Role of Microbial Factors in Autoimmune ...PubMedInfection-Related Glomerulonephritis - StatPearls - NCBI BookshelfPubMedManagement of immune-mediated glomerular diseases in the elderly

Staphylococcal infection-associated GN with glomerular IgA deposition is a high-stakes mimic of primary IgA nephropathy. Features favoring infection-associated disease are a concurrent staphylococcal infection, acute renal failure, and often massive proteinuria; gross hematuria after an upper respiratory infection is more characteristic of IgA nephropathy. Search for occult infection before considering immunosuppression for an apparent IgA nephropathy presentation. ccjm+1ccjmIgA nephropathy | Cleveland Clinic Journal of medicinePubMedGlomerular Diseases Associated with Infection

Endocarditis-associated GN should remain prominent when nephritic urinary abnormalities coexist with constitutional symptoms, cardiac findings, embolic phenomena, or unexplained inflammation. Infection eradication with antibiotics for 4 to 6 weeks usually corrects serologic abnormalities, although microscopic hematuria, proteinuria, and elevated creatinine can persist for months. PubMedPubMedGlomerular Diseases Associated with Infection

C3-dominant infection-related GN and C3 glomerulopathy can have similar biopsy appearances. Infection-related disease is often preceded by infection and improves after infection resolution; persistent hematuria or proteinuria after a biopsy pattern of postinfectious GN should prompt evaluation for alternative-pathway complement abnormalities and possible C3 glomerulopathy. Oxford Academic+1Oxford Academic627 C3 glomerulonephritis and C3-dominant infection related ...Kidney InternationalAtypical postinfectious glomerulonephritis is associated with abnormalities in the alternative pathway of complement

Proceed urgently to kidney biopsy in rapidly progressive glomerulonephritis, unexplained acute kidney injury with active urine sediment, severe proteinuria, or when ANCA-associated vasculitis, anti-GBM disease, C3 glomerulopathy, cryoglobulinemia, lupus nephritis, or infection-related GN remain plausible. The same diffuse proliferative pattern can result from acute infection, lupus nephritis, or cryoglobulinemia, whereas immunofluorescence can classify the process by its deposits. ScienceDirectScienceDirectAcute glomerulonephritis - ScienceDirect

Do not treat a positive ANCA result as sufficient proof that infection is absent or that vasculitis is the sole driver. ANCA-associated vasculitis may be supported by a typical clinical presentation plus PR3-ANCA or MPO-ANCA, and EULAR recommends both ANCA testing and biopsy to assist diagnosis. BMJBMJEULAR recommendations for the management of ANCA-associated vasculitis: 2022 update | Annals of the Rheumatic Diseases

A biopsy showing crescents during active infection creates a management conflict. Pulse corticosteroids and plasma exchange have been used alongside effective antibiotics in crescentic endocarditis-associated GN, but their added value is undefined; in IgA-dominant staphylococcal GN, corticosteroids are contraindicated. PubMedPubMedGlomerular Diseases Associated with Infection

Initiate pathogen-directed antimicrobial therapy and source control once infection is identified or strongly suspected, while managing hypervolemia, hypertension, and kidney dysfunction. This framework applies across poststreptococcal, staphylococcal, other bacterial, viral, and parasitic infection-related GN, although the specific anti-infective regimen must follow the pathogen and source. PubMedPubMedInfection-Related Glomerulonephritis - StatPearls - NCBI Bookshelf

Use fluid and sodium restriction when hypervolemia is present, and monitor daily weight, blood pressure, urine output, creatinine, potassium, and bicarbonate during acute kidney injury. Escalate renal replacement therapy for standard kidney-failure complications when medical management does not control volume, electrolyte, acid-base, or uremic consequences; dialysis-requiring kidney injury is reported in severe infection-related GN. PubMed+1PubMedInfection-Related Glomerulonephritis - StatPearls - NCBI BookshelfPubMedManagement and outcomes of acute post-streptococcal glomerulonephritis in children

Avoid corticosteroids for IgA-dominant staphylococcus-related GN: antibiotic treatment is indicated because renal recovery may occur, whereas corticosteroid therapy is contraindicated. This distinction is the principal reason to establish whether IgA deposition reflects infection-associated GN or primary IgA nephropathy. PubMedPubMedGlomerular Diseases Associated with Infection

For endocarditis-associated GN, effective antibiotics for 4 to 6 weeks usually eradicate infection and correct serologic abnormalities. Do not interpret persistent microscopic hematuria, proteinuria, or elevated creatinine in the first months after microbiologic cure as automatic treatment failure; these abnormalities may resolve gradually. PubMedPubMedGlomerular Diseases Associated with Infection

Follow creatinine, estimated kidney function, urine protein, hematuria, blood pressure, and volume status after treatment. In endocarditis-associated GN, C3 normalization during therapy correlates with a good outcome, while urinary abnormalities and creatinine elevation may persist for months despite infection eradication. PubMedPubMedGlomerular Diseases Associated with Infection

Persistent hematuria and proteinuria after a postinfectious biopsy pattern should trigger reassessment rather than passive observation. In atypical postinfectious GN, persistent urinary abnormalities for 4 to 48 months were associated with alternative-pathway complement abnormalities; this phenotype may overlap with C3 glomerulopathy. Kidney InternationalKidney InternationalAtypical postinfectious glomerulonephritis is associated with abnormalities in the alternative pathway of complement

Counsel adult patients that renal prognosis is materially worse than in children. After poststreptococcal GN, residual hypertension and chronic kidney disease may occur in 30% to 50% of adults; with staphylococcal infection-associated GN, sustained chronic kidney disease has been reported in up to 77%. Prognosis depends on pathogen, baseline kidney function, rapidly progressive presentation, and timing of treatment. PubMedPubMedInfection-Related Glomerulonephritis - StatPearls - NCBI Bookshelf