Nephritis vs nephrotic syndrome
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I now have comprehensive material from multiple authoritative nephrology and pathology textbooks. Here is a detailed comparison:
Nephritis (Nephritic Syndrome) vs Nephrotic Syndrome
Core Concept
| Nephritic Syndrome | Nephrotic Syndrome | |
|---|---|---|
| Primary lesion | Glomerular inflammation → disrupted capillary wall integrity | Glomerular permeability defect → protein leaks freely |
| Cell type affected | Endothelial/mesangial cells + infiltrating leukocytes | Podocytes (visceral epithelial cells) |
| Pathologic pattern | Proliferative, inflammatory | Podocytopathy; minimal/sclerosing/membranous changes |
Clinical Features Compared
| Feature | Nephrotic | Nephritic |
|---|---|---|
| Onset | Insidious | Abrupt |
| Edema | ++++ (massive, periorbital, pitting) | ++ (mild–moderate) |
| Blood pressure | Normal | Raised |
| Jugular venous pressure | Normal/low | Raised |
| Proteinuria | ++++ (>3.5 g/day) | ++ (subnephrotic) |
| Hematuria | May/may not occur | +++ (brown/cola urine) |
| RBC casts | Absent | Present ✓ |
| Serum albumin | Low (<3 g/dL) | Normal or slightly reduced |
| GFR/Azotemia | Preserved early | Reduced (oliguria, azotemia) |
— Comprehensive Clinical Nephrology, 7th Ed., Table 16.4
Pathophysiology
Nephritic Syndrome
- Immune-mediated inflammation → proliferation of glomerular cells + leukocyte infiltration
- Severely injures capillary walls → RBCs escape into urine (hematuria, RBC casts)
- Hemodynamic changes → reduced GFR → oliguria, fluid retention, azotemia
- Hypertension from fluid overload + renin release from ischemic kidneys
Nephrotic Syndrome
- Increased GBM permeability + slit diaphragm disruption (podocyte injury)
- Massive proteinuria → hypoalbuminemia → reduced plasma oncotic pressure → edema
- Secondary aldosterone/sympathetic activation → further Na⁺/water retention
- Hyperlipidemia and lipiduria: liver upregulates lipoprotein synthesis to compensate for low oncotic pressure
- Loss of antithrombin III, protein C/S → thromboembolism risk (DVT, renal vein thrombosis in 10–40%)
- Loss of immunoglobulins → infection susceptibility
— Robbins & Cotran Pathologic Basis of Disease; Tietz Textbook of Laboratory Medicine, 7th Ed.
Urine Sediment
| Nephritic | Nephrotic | |
|---|---|---|
| Casts | RBC casts (pathognomonic) | Fatty casts, oval fat bodies |
| RBCs | Dysmorphic RBCs | Rare |
| Protein | Moderate | Massive (>3.5 g/day) |
| Appearance | Smoky/brown ("Coca-Cola urine") | Frothy |
Causes
Nephritic Syndrome
- Postinfectious GN (post-streptococcal — most classic; types 1, 4, 12 group A β-hemolytic strep)
- IgA nephropathy (Berger disease)
- Rapidly progressive GN (RPGN/crescentic GN) — anti-GBM (Goodpasture), immune complex, ANCA-associated
- Lupus nephritis (proliferative forms)
- Membranoproliferative GN (can overlap with nephrotic)
Nephrotic Syndrome
| Disease | Age Group | Notes |
|---|---|---|
| Minimal Change Disease (MCD) | Children (most common) | Podocyte foot process effacement only on EM |
| Focal Segmental Glomerulosclerosis (FSGS) | Adults (most common primary) | Can be HIV-related (collapsing FSGS) |
| Membranous Nephropathy | Adults | PLA2R antibody; 2° causes: HBV, malignancy |
| Diabetic nephropathy | Adults | Secondary; most common overall |
| Amyloidosis | Older adults | Congo red positive |
| Lupus nephritis (membranous type) | Women | Secondary |
Key Complications
| Complication | Nephrotic | Nephritic |
|---|---|---|
| Thromboembolism | ✓✓ (loss of antithrombin III) | Less common |
| Infection | ✓ (loss of IgG, complement) | Less common |
| Hyperlipidemia / atherosclerosis | ✓✓ | — |
| AKI / kidney failure | Can occur (FSGS, MCD in elderly) | ✓ (RPGN can cause rapid loss) |
| Hypertensive emergency | — | ✓ |
Memory Hooks
- NephrItic = Inflammation → Injured vessels → blood in urine (hematuria, RBC casts, hypertension)
- NephrOtic = Oozing protein → Oedema, hypOalbuminemia, hyperlipidemia
Note: Some diseases (e.g., membranoproliferative GN, lupus nephritis) can present with overlap of both syndromes — the two are not always mutually exclusive.
— Comprehensive Clinical Nephrology, 7th Ed.; Robbins & Cotran Pathologic Basis of Disease; Tietz Textbook of Laboratory Medicine, 7th Ed.
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