Kidney and Urinary Tract Disease - Diseases (30 & 31) Flashcards
(216 cards)
Function of the kidneys
- Eliminating metabolic waste products
- Regulating fluid and electrolyte balance
- Influencing acid-base balance
- Production of hormones (Renin, erythropoietin)
Function of the kidneys
- Eliminating metabolic waste products
- Regulating fluid and electrolyte balance
- Influencing acid-base balance
- Production of hormones (Renin, erythropoietin)
How many people develop acute renal failure in England?
26,000/year
Acute renal failure presentation
Rapid rise in creatinine and urea, generally unwell
Nephrotic syndrome presentation
Oedema, protein uria and hypoalbuminaemia, proteinuria >3g/24 hr (albumin)
Acute nephritis (nephritic syndrome)
Oedema, proteinuria, haematuria, renal failure
Chronic renal failure
Slow declining renal function
What part of kidney allows filtration?
Foot processes, endothelial cells and basement membrane in podocytes in glomerulus i
Blood flow in kidney
Renal artery > afferent arterioles > glomerulus > efferent arteriole > proximal convoluted tubule (PCT) > loop of hence > distal convoluted tubule > collecting duct/renal vein
Immunological causes of damage to BM
- Circulating immune complexes deposit in glomerulus
- Circulating antigens deposit in glomerulus
- Antibodies to BM/other components of glomerulus
Immunological causes of damage to BM damage the glomeruli via
Complement activation, neutrophil activation, reactive oxygen species, clotting factors
Non-Immunological causes of damage to BM > GD
- Hyperglycaemia
- Inherited disease (abnormal podocytes)
- Deposition of abnormal proteins (amyloid)
Non-Immunological causes of damage to vessels > GD
Injury to endothelium of vessels
Ischaemic mechanisms of tubular damage
Hypotension, damage to vessels within kidney, glomerular damage > reduced blood supply
Toxic mechanisms of tubular damage
Direct toxins, hypersensitivity reactions (to drugs), deposition of crystals in tubules (gout), deposition of abnormal proteins in tubules
Mechanisms of vascular damage
Hypertension, diabetes, atheroma, vasculitis, thrombotic microangiopathy (rare)
Vasculitis
Obliteration of lumen by inflammation, inflammation of larger arterioles > hypoxia, adults and children affected e.g. Wegener’s granulomatosis
Thrombotic microangiopathy
Thrombi in capillaries and small arterioles, damage endothelium (bacterial toxins, drugs, abnormal clotting) e.g. haemolytic uraemic syndrome
Glomerular diseases
Membranous nephropathy (idiopathic) FSGS (idiopathic) Mesangiocapillary glomerulonephritis (idiopathic) Minimal change disease Post-infective glomerulonephritis Anti-GBM disease IgA nephropathy Henoch-Schonlein purpura Lupus nephritis (in SLE)
Cause of nephrotic syndrome
Damage to glomerulus
Symptoms of nephrotic syndrome
Oedema, proteinuria (>3g in 24hr), hypoalbuminaemia
+/- hypertension, hyperlipidaemia
Complications of nephrotic syndrome
Infection, thrombosis
Causes of nephrotic syndrome in Adults
Membranous nephropathy, focal segmental glomerulosclerosis, minimal change disease, diabetes, lupus nephritis, amyloid
Membrane nephropathy
Idiopathic, adults 30-60, M>F, 20-30% progress to end stage renal failure