Pathology Cheat Sheet
Read the Compartment
Renal compartments for NEET-PG: nephron anatomy, glomerular filtration barrier, nephritic vs nephrotic syndrome, red cell casts, and isosthenuria patterns.
MedNext Academy | 3 min read
Read the Compartment
Renal compartments for NEET-PG: nephron anatomy, glomerular filtration barrier, nephritic vs nephrotic syndrome, red cell casts, and isosthenuria patterns.
Normal kidney histology and the clinical syndromes of renal disease, framed by the four renal compartments.
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- The nephron consists of the glomerulus, proximal tubule, loop of Henle, distal tubule, and collecting duct.
- The four renal compartments are glomeruli, tubules, interstitium, and blood vessels, and each disease targets one primarily.
- The glomerular filtration barrier comprises fenestrated endothelium, the basement membrane, and podocyte foot processes.
- Nephritic syndrome features haematuria, red cell casts, hypertension, and mild proteinuria.
- Nephrotic syndrome features heavy proteinuria over 3.5 grams per day, hypoalbuminaemia, oedema, and hyperlipidaemia.
- Acute kidney injury is a rapid fall in glomerular filtration causing rising urea and creatinine.
- Chronic kidney disease is progressive irreversible loss of nephrons over months to years.
- Podocytes maintain the slit diaphragm that prevents protein loss into the urine.
- The juxtaglomerular apparatus secretes renin and regulates blood pressure and filtration.
- Red cell casts localise bleeding to the glomerulus, while muddy brown casts indicate tubular injury.
- Isosthenuria with a fixed specific gravity indicates loss of tubular concentrating ability.
- Identifying the affected compartment is the first step in diagnosing renal disease.
Mapped competency codes
- PA28.1
- PA28.2
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This summary maps to PA28-urinary-tract.
Frequently Asked Questions
What are the four compartments of the kidney?
The glomeruli, the tubules, the interstitium, and the blood vessels, and identifying which is primarily affected guides the diagnosis of renal disease.
How do nephritic and nephrotic syndromes differ?
Nephritic syndrome has haematuria with red cell casts, hypertension, and mild proteinuria, while nephrotic syndrome has heavy proteinuria, hypoalbuminaemia, oedema, and hyperlipidaemia.
What forms the glomerular filtration barrier?
The fenestrated capillary endothelium, the glomerular basement membrane, and the podocyte foot processes with their slit diaphragms.
What is isosthenuria?
A fixed urine specific gravity around 1.010 indicating that the tubules can neither concentrate nor dilute the urine, reflecting tubular damage.
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