Nephritic vs nephrotic syndrome
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Nephritic vs Nephrotic Syndrome
Core Pathophysiology
| Nephritic | Nephrotic | |
|---|---|---|
| Mechanism | Glomerular inflammation - proliferation of glomerular cells + leukocyte infiltration, injuring capillary walls | Increased permeability of glomerular capillary wall to proteins (structural/physicochemical defect in GBM/podocytes) |
| Primary defect | Capillary wall disruption - blood leaks into urine | Protein leaks across the filtration barrier |
Clinical Features at a Glance
| Feature | Nephrotic | Nephritic |
|---|---|---|
| Onset | Insidious | Abrupt |
| Proteinuria | Massive (>3.5 g/day in adults) ++++ | Sub-nephrotic range ++ |
| Hematuria | May or may not occur | +++ (hallmark) |
| RBC casts | Absent | Present (hallmark) |
| Serum albumin | Low (<3 g/dL) | Normal or slightly reduced |
| Edema | Massive, pitting, periorbital/dependent (++++) | Mild-moderate (++) |
| Blood pressure | Normal | Raised |
| JVP | Normal/low | Raised |
| Azotemia/oliguria | Absent or mild | Common (reduced GFR) |
| Lipids | Hyperlipidemia + lipiduria | Normal |
(Table adapted from Comprehensive Clinical Nephrology, 7e, Table 16.4)
Nephrotic Syndrome - Key Details
Diagnostic criteria: Proteinuria >3.5 g/day + hypoalbuminemia + generalized edema + hyperlipidemia/lipiduria
Pathophysiology cascade:
- Glomerular barrier damage → protein leaks (massive proteinuria)
- Protein loss > liver synthesis → hypoalbuminemia
- Low oncotic pressure → generalized edema (periorbital, ascites, pleural effusions)
- Sodium/water retention (aldosterone, sympathetic activation, reduced ANP) worsens edema
- Liver compensatory lipoprotein synthesis + reduced catabolism → hyperlipidemia
- Lipoproteins leak → lipiduria (oval fat bodies, free fat in urine)
Complications unique to nephrotic:
- Thrombosis/thromboembolism - loss of antithrombin III and other anticoagulants in urine; renal vein thrombosis is especially associated with membranous nephropathy
- Infections - loss of immunoglobulins (esp. staphylococcal and pneumococcal)
Causes by prevalence:
| Cause | Children | Adults |
|---|---|---|
| Minimal change disease | 75% | 8% |
| Focal segmental glomerulosclerosis (FSGS) | 10% | 35% |
| Membranous nephropathy | 3% | 30% |
| Membranoproliferative GN | 10% | 10% |
| Secondary (DM, amyloid, SLE, drugs) | rare | common |
(Robbins & Cotran, Table 20.7)
Nephritic Syndrome - Key Details
Core features: Hematuria (RBCs + RBC casts) + subnephrotic proteinuria + azotemia + oliguria + hypertension
Pathophysiology: Inflammatory proliferation damages capillary walls → blood enters urine + reduced GFR → fluid retention → hypertension (also from renin release from ischemic kidneys)
Causes:
| Disease | Key feature |
|---|---|
| Post-streptococcal GN | Subepithelial immune deposits; types 1, 4, 12 group A strep; latent period 1-4 weeks |
| IgA nephropathy (Berger's) | Mesangial IgA deposits; most common GN worldwide |
| RPGN/Crescentic GN | Rapid kidney function loss over days-weeks; crescents in Bowman's space |
| Anti-GBM (Goodpasture's) | Type I RPGN; linear IgG deposits on GBM |
| ANCA-associated vasculitis | GPA, MPA, EGPA; pauci-immune |
| Lupus nephritis | Immune complex-mediated; can also cause nephrotic |
| Cryoglobulinemia | Often hepatitis C-associated |
| Infective endocarditis | Immune complex deposition |
Mixed Presentations
Some diseases sit in both categories - notably membranoproliferative GN (MPGN) and lupus nephritis, which can present with nephrotic syndrome, nephritic syndrome, or a combination of both.
Urine Sediment: The Key Differentiator
- Nephritic: "Active sediment" - dysmorphic RBCs, RBC casts, granular casts. These are virtually pathognomonic of glomerular inflammation.
- Nephrotic: "Bland sediment" - fatty casts, oval fat bodies, waxy casts. Little to no hematuria.
Memory Hook
Nephr-OTic = Oedema + Three point five grams protein. Leaky barrier, not inflamed.
Nephr-ITic = IT (inflammation) = hematuria + hypertension. Inflamed, broken capillaries.
Sources: Robbins & Cotran Pathologic Basis of Disease; Comprehensive Clinical Nephrology, 7e; Goldman-Cecil Medicine; Frameworks for Internal Medicine
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