​Kembara Xtra - Medicine - Acute Glomerulonephritis

​Kembara Xtra - Medicine - Acute Glomerulonephritis 
An inflammation of the kidney's glomerulus causes acute glomerulonephritis (GN), which leads to a clinical syndrome of sudden onset of hematuria, proteinuria, and renal insufficiency, frequently in conjunction with hypertension and edema.
Clinical severity ranges from self-limited asymptomatic microscopic or gross hematuria to a quickly progressive loss of kidney function over days to weeks, known as rapidly progressive GN (RPGN). Acute GN may be caused by spontaneous glomerular disease or owing to systemic disease.


Caution 

To prevent irreparable renal function loss, immediate examination and treatment are necessary.

Epidemiology 
Postinfectious GN is most frequently seen after a group A -hemolytic Streptococcus infection has cleared up. Other bacterial infections, such as infective endocarditis and VP shunt nephritis, as well as less often occurring viral, helminthic, or parasite infections, may also result in IgA nephropathy, the most prevalent primary GN in the world. It is most prevalent in people in their second and third decades. Geographical differences in incidence: Asia versus the US Anti-GBM disease; Goodpasture syndrome, a significant cause of pulmonary-renal syndrome; peak distribution between the third and sixth decades; ANCA-associated GN; frequently has a relapsing and remitting course; HSP, the variant with extrarenal symptoms, typically affects children under 10 years old. (4) Four illness manifestations
Granulomatosis with polyangiitis (GPA), formerly known as Wegener granulomatosis, Microscopic Polyangiitis (MPA), Isolated Pauci-Immune Granulomatosis (GN) that is limited to the kidneys, Eosinophilic GPA, formerly known as Churg-Strauss disease, GN that is relatively common but rarely causes severe renal involvement, MPGN, which may be primary or secondary to systemic diseases
Lupus nephritis - Renal involvement occurs in about 60% of patients with systemic lupus. Compared to white populations, lupus nephritis is more common in black and Hispanic populations.
- six classes
Focal proliferative (active) and/or sclerosing (chronic) disease; minimal mesangial disease; mesangial proliferation
 Global or segmental widespread proliferative illness that is active or chronic Membranous lupus nephritis, advanced sclerosis lupus nephritis, and cryoglobulin-associated vasculitis are all possible causes. Hepatitis C virus (HCV) infection accounts for 80% of cases.

Prevalence

GN was much less common in patients between the ages of 37 and 65 years old, with only about 0.12% of people affected by either primary or secondary GN. Patients >65 years old, with an average age of 75 years, have about 1.2% of people affected by either primary or secondary GN. Unknown are the prevalence and incidence of GN in kids. The most typical form of GN is acute postinfectious, however it has become less frequent over time.


Pathophysiology and Etiology 

Immune activity on a local or systemic level results in glomerular damage.
Antigen-antibody production and deposition in the kidneys are immune-complex mediated. Immunofluorescence exhibits immune complexes.
Direct antibody-mediated damage, linear staining on immunofluorescence, Postinfectious GN, IgA nephropathy, MPGN, Cryoglobulin-associated GN, and Lupus nephritis Anti-GBM illness
Pauci-immune GN that is ANCA-associated but not visible on immunofluorescence staining
C3 glomerulopathy caused by alternative complement pathway deregulation

Risk Elements 

Streptococci nephritigenic strain outbreaks are what cause postinfectious GN.
Previous lung damage and inhalation exposures, such as hydrocarbon solvents, have been linked to anti-GBM illness.
Drugs, such as hydralazine or cocaine tainted with levamisole, may cause ANCA-associated GN, which is also linked to environmental exposures like silica.
Hepatitis B has been linked to MPGN. Both MPGN and cryoglobulinemic GN are linked to hepatitis C.

Diagnosis: Edema, dyspnea, nonspecific malaise, decreased urine volume, cola- or tea-colored urine, blurred vision, lightheadedness, headache, impaired mentation, vertigo, and dizziness.
Poststreptococcal GN often develops 1–3 weeks after pharyngitis or 2–6 weeks after a skin infection.
- A few days after an acute infection, IgA nephropathy may develop.
● Patients may also present with symptoms that are more particular to the underlying condition: - Lupus nephritis: rash or joint discomfort
Hemoptysis is a symptom of pulmonary-renal disorders (see "Physical Exam"). - ANCA-associated GN: arthralgias, sinusitis, and pulmonary infiltrates
– IgA-HSP: purpura and joint or gastrointestinal pain
- Purpura and cutaneous vasculitis are Cryoglobulinemia-associated GN.

clinical assessment 
The majority of individuals will have normal exams, although they occasionally show indicators of fluid excess and hypertension.
Sinus disease: GN/GPA linked with ANCA
Postinfectious GN or IgA nephropathy in pharyngitis or impetigo
Hepatocellular hyperplasia or liver tenderness: cryoglobulinemia-associated GN or IgA nephropathy. Pulmonary hemorrhage (pulmonary-renal syndrome): anti-GBM disease/Goodpasture, ANCA-associated GN, or lupus nephritis.
HSP/IgA nephropathy or GN coupled with ANCA cause purpura
DISTINCTIVE DIAGNOSIS
Trauma, prostate conditions, urologic malignancy, cystitis, nephrolithiasis, renal cysts, and thrombotic microangiopathy are all causes of non-glomerular hematuria. 

Initial test results from the laboratory and imaging
glomerular hematuria is indicated by dysmorphic red blood cells (RBCs) or RBC casts on urine microscopy, which strongly suggests the diagnosis of an acute GN.
– White blood cell casts and pyuria are possible side effects.
Proteinuria: random urine protein/creatinine ratio or 24-hour collection
Complete blood count, blood urea nitrogen, creatinine, and electrolytes
Serologies could clarify the etiology: Streptozyme, antistreptolysin O titer
- Levels of complement (C3, C4)
- Antinuclear antibody (ANA) to rule out lupus nephritis - Myeloperoxidase and anti-proteinase tests as part of the ANCA screening 3 antibodies
Hepatitis B surface antigen and antibody, Hepatitis C antibody, and cryoglobulins are all examples of antibodies.
- The Rheumatoid Factor
HIV testing, evaluation for monoclonal gammopathies using serum free light chain, renal ultrasound to rule out structural reasons of glomerular illness, and a chest x-ray in cases of hemoptysis or suspected infiltration 

Diagnostic Procedures/Other

Renal biopsy is used to provide a final diagnosis.
Interpretation of Tests
Light microscopy of a renal sample reveals diffuse hypercellularity, which points to a proliferative condition such IgA nephropathy, lupus nephritis, or postinfectious GN.
– The severity of the disease and the presence of glomerular crescents are correlated.
- Immunofluorescence shows significant overlap between endothelial, mesangial, and epithelial cell proliferation
IgG, IgA, IgM, C3, and C4 staining patterns could be used to help identify the GN.
- All immunoglobulins and complements are frequently positive for lupus nephritis IgA nephropathy is pathognomonic for isolated mesangial IgA staining.
- Crescentic GN suggests GN linked with ANCA when immune complex staining is absent.
- The crescent-shaped GN and linear IgG staining are signs of anti-GB.
Using electron microscopy, it is possible to identify a specific diagnosis based on where immunoglobulin deposits are found.

Management 
If you can, take care of the underlying problem.

First Line of Medicine
Diuretics, calcium channel blockers, and ACE inhibitors or ARBs should be avoided if there is acute renal impairment.
Next Line
Crescents on renal biopsy may be a signal for steroids in postinfectious GN and, in other situations, are frequently an indication for more powerful immunosuppressive drugs. Supportive care is typically sufficient in postinfectious GN.

 Antiviral therapy for the treatment of nephritic syndromes that have been demonstrated to be caused by underlying viral infections such hepatitis C virus (HCV) and hepatitis B virus (HBV).
Among the often prescribed immunosuppressive drugs are: - Corticosteroids, which may be started in high dosages even before a kidney biopsy (2)[C]
- Mycophenolate mofetil (MMF), cyclosporine, and tacrolimus are calcineurin inhibitors.
The immunosuppressive drug of choice will rely on the patient's features and the disease process.
In some cases of RPGN or ANCA-associated renal illness with diffuse pulmonary bleeding, plasmapheresis may also be considered.

Uremia, hyperkalemia that is resistant to medical treatment, intractable acidosis, and diuretic-resistant pulmonary edema may all require dialysis.


Referral 

In order to confirm the diagnosis and aid in care, renal biopsy usually requires consultation with a nephrologist.
In situations where there are systemic signs, consulting a rheumatologist may also be beneficial.


Admission Patients with no urine output, rapidly declining renal function, substantial hypertension, and a suspicion of pulmonary bleeding or fluid overload impairing heart or respiratory function should be given admission consideration.
Patients who are hemodynamically stable and have no problems may be treated as outpatients.

Patient Follow-Up Monitoring

Regular clinical evaluation to identify suspicious symptoms that could indicate a recurrence (such as rash, joint complaint, hemoptysis), regular blood pressure checks and urinalysis to identify recurrence, and assessment of renal function to identify acute or follow chronic renal disease as a result of the initial event
Reevaluating serology tests on a regular basis to monitor asymptomatic people

Eat a salt-restricted diet (2 g/day) and limit fluid intake until edema and hypertension subside. If there is severe renal failure, stay away from foods high in potassium and phosphorus.


Prognosis: The GN may be self-limited or a complication of a chronic condition that increases the likelihood that acute disease will reoccur. There is also a chance that renal function will gradually deteriorate over time.
Some types of acute GN, such as severe lupus and ANCA-associated GN, call for long-term immunosuppression to prevent recurrence.

Complications include microscopic hematuria, hypertensive retinopathy, and encephalopathy.
Chronic renal failure
Nephrotic syndrome (less than 10%)