Nephrotic vs nephritic syndrome from harrison book in notes concise form
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I now have all the key content from Harrison's. Let me compile the concise comparison notes.
Nephrotic vs Nephritic Syndrome
Harrison's Principles of Internal Medicine, 22E (2025)
Quick Comparison Table
| Feature | Nephrotic | Nephritic |
|---|---|---|
| Core defect | Glomerular barrier permeability loss (podocyte injury) | Glomerular inflammation |
| Proteinuria | Heavy (>3.5 g/day) | Mild-moderate |
| Hematuria | Minimal/absent | Prominent (RBCs + RBC casts) |
| Pyuria | Absent | Present (PMN leukocytes) |
| Urinary casts | Fatty/waxy casts | RBC casts, cellular casts |
| Edema | Marked (hypoalbuminemia-driven) | Present (salt/water retention) |
| Hypertension | Present | Prominent |
| GFR/Urine output | Variable | Low (oliguria/anuria common) |
| Serum albumin | Low | Normal or mildly low |
| Cholesterol | High (hypercholesterolemia) | Usually normal |
| Complement | Variable | Often LOW (immune complex types) |
Nephritic Syndrome - Key Points
Definition: Inflammatory condition of the kidney (glomerular, tubulointerstitial, or vascular).
Classic triad:
- Hematuria (with RBC casts)
- Pyuria (PMN leukocytes)
- Mild-moderate proteinuria
Plus: Hypertension, volume expansion, edema, oliguria/anuria
Urinalysis: "Active sediment" - mix of RBCs + inflammatory cells + cellular casts. Spun urine sediment examination is mandatory for diagnosis.
Pathophysiology: Inflammatory damage to glomeruli → fall in GFR → salt/water retention → edema + HTN. May progress to uremic symptoms.
Time course: Acute (days-weeks, e.g., postinfectious GN) or chronic/smoldering (months-years).
Key causes:
- Poststreptococcal GN (prototype - endocapillary proliferative GN; M-type nephritogenic streptococci; throat/skin infection preceding renal disease)
- Lupus nephritis
- IgA nephropathy
- ANCA vasculitis
- Anti-GBM disease
Complement: Usually LOW in immune complex diseases (SLE, syphilis, cryoglobulinemia)
Nephrotic Syndrome - Key Points
Classic pentad:
- Heavy proteinuria (>3.5 g/day; foamy urine)
- Hypoalbuminemia
- Hypercholesterolemia
- Edema (generalized)
- Hypertension
Pathophysiology: Podocyte injury → loss of glomerular filtration barrier → massive protein leak → hypoalbuminemia → edema, hypercoagulability, hyperlipidemia.
Important consequences:
- Hypercoagulability - loss of clotting factor binding proteins (treat with anticoagulants)
- Hyperlipidemia - increased CV risk (treat with lipid-lowering agents)
- Altered drug/hormone binding - e.g., loss of thyroid-binding globulin alters TFT results
- Progressive GFR loss - higher 24-h proteinuria = faster GFR decline
Subtypes by glomerular involvement:
- Subnephrotic albuminuria = focal disease (<50% glomeruli)
- Full NS = diffuse disease (most glomeruli involved)
Primary causes (from Harrison's):
| Disease | Key Feature | Age Group |
|---|---|---|
| Minimal Change Disease (MCD) | Normal LM; foot process effacement on EM; T-cell cytokines (IL-13, IL-4); responds to steroids | 70-90% in children; 10-15% in adults |
| Focal Segmental Glomerulosclerosis (FSGS) | APOL1 mutations in African ancestry; second hit (infection/inflammation) → podocyte damage | Adults |
| Membranous Nephropathy | PLA2R, THSD7A antibodies | Adults |
General management:
- Diuretics for edema (avoid intravascular depletion)
- Statins for hypercholesterolemia
- Anticoagulation if hypercoagulable complications
- RAAS inhibitors + SGLT2i to reduce proteinuria and preserve GFR
Memory Hook
"Nephr-OTic = pOur Out protein" (big proteinuria, no blood) "Nephr-ITic = inflam-IT-ion" (blood + casts + inflammatory cells)
Biopsy Terminology (Harrison's)
| Term | Meaning |
|---|---|
| Focal | <50% glomeruli involved |
| Diffuse | >50% glomeruli involved |
| Segmental | Part of the glomerular tuft |
| Global | Most of the glomerulus |
| Endocapillary proliferation | Cell proliferation within capillary tuft |
| Extracapillary proliferation | Proliferation into Bowman's space (crescents) |
| Crescents | Fibrocellular collections in Bowman's space - severe disease |
| Interstitial fibrosis | Irreversible; sign of progression to kidney failure |
Source: Harrison's Principles of Internal Medicine, 22E (2025) - Chapters on Glomerular Syndromes (blocks 33-34)
Gr
Glad it was helpful! Let me know if you need anything else — more topics from Harrison's, deeper dive into any specific glomerular disease, or notes on management. 😊
Create it in picture form with child examplee
Generating Image
Here's your visual comparison poster with child examples!
Quick recap of the two child cases shown:
- Nephrotic (blue side): 7-year-old with puffy eyes on waking, swollen legs, foamy urine - classic Minimal Change Disease. No blood, just massive protein loss.
- Nephritic (red side): 10-year-old, 2 weeks after strep throat, cola-colored urine + high BP - classic Post-Streptococcal GN. Think inflammation, RBC casts, low C3.
The memory hook at the bottom ties it together - let me know if you want flashcard versions or deeper notes on any specific disease! 😊
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