renal Flashcards
What is the function of the kidney?
- •Regulation of blood volume
- •Regulation of blood pressure
- •Acid-base balance
- •Electrolyte balance
- •Production of Red blood cells
- •Synthesis of Vitamin D – Bone metabolism
- •Excretion of water-soluble waste products – Filter
What are the different stages of AKI?
Stage 1: creatinine rise of 1.5x compared to baseline or urine output <0.5 ml/kg/hour for 6 hours.
Stage 2: creatinine rise of 2x compared to baseline or urine output <0.5 ml/kg/hour for 12 hours.
Stage 3: creatinine rise of 3x
How does the patient present in AKI?
Symptoms
- •Depends on underlying CAUSE
- •Oliguria/anuria
- •NOTE: abrupt anuria suggests post-renal obstruction
- •Nausea/vomiting
- •Dehydration
- •Confusion
Signs
- •Hypertension
- •Distended bladder
- •Dehydration - postural hypotension
- •Fluid overload (in heart failure, cirrhosis, nephrotic syndrome) - raised JVP, pulmonary and peripheral oedema
- •Pallor, rash, bruising (vascular disease)
What is the mechanism behind pre renal failure?
What are the complication?
Due to Renal Hypoperfusion, most common causes are hypotension due to sepsis and hypovolaemia from fluid loss.
No blood to kidney = no pee = AKI
Haemolytic uraemic syndome
What is it charactrised by?
What is the pathophysiology
WHat infection precedes it usually
What is the treatment
What is it charactrised by?
- Progressive renal failure - Kidneys
- Microangiopathic haemolytic anaemia (MAHA) – Blood
- ↓ Platelets - Blood
What is the pathophysiology?
- Gastroenteritis (E.coli 90%) -> toxin
- Endothelial damage
- Thrombosis, platelet consumption + fibrin strand deposition → ↓ Platelets
- Destruction of RBCs – schistocytes, ↓ Hb
What infection precedes it usually?
E coli
What is the treatment?
Mainly supportive
- dialysis
- NO antibiotics
How do treat Diabetic nephropathy?
What is the spectrum of Glomerulonephritis?
Name one important fact about them and where thy are on the spectrum
NEPHROTIC:
Primary:
Minimal change disease- in children - treat with corticosteoids
Membranous Nephropathy/Glomerulonephritis- commonest type in adults- subepithelial immune complex deposits
Focal segmental glomerulosclerosis- sclerosing of glomeruli in segments- IgM and complement deposition
Membranoproliferative glomerulonephritis- really rare
Secondary to Systemic Disease
- DM- 5 stages, Stage 1 hyperfiltration, Stage 2 silent, Stage 3 microalbuminuria, Stage 4 persistant protenuria with hypertension, Stage 5 end stage renal disease
- SLE- SOAP BRAIN MD
- Amyloidosis
Nephritic
- IgA Nephropathy / Berger’s Disease- commonest -macroscopic haematuria few days after Upper respiratory tract infecton- IgA & C3 depostition
- Post-streptococcal glomerulonephritis- 1-2 weeks after sore throat or skin infection- common in children
- Crescentic/ Rapidly progressive glomerulonephritis
- Type 1: Anti-GBM- Goodpasture syndrome- Anti GBM antibodies against type 4 collagen- affects long and kidney
- Type 2- Immune complex deposition
- Type 3 Pauci immune
- Thin BM Disease - Autosomal dominant- thinning GBM by mutatio of type 4 collagen alpha 4 chain
- Alport’s Syndrome- X- linked recessive 4 collagen alpha 5 chain, EAR sensory neural deafness, EYE, lense dislocation - cataract
TTP
What are t?
What is the pathophysiology?
What is the pentad?
What is it?
What is the pathophysiology?
- Deficiency of protease (ADAMTS13) that cleaves cleave vWF à
- Large vWF multimers form à
- Platelet aggregation & fibrin deposition
- Microthrombi
What is the pentad?
ADAMTS-13
NO Antibody
Decreased platelet
AKI
MAHA
Temperature
Swinging CNS (Seizures, hemiparesis, ↓ consciousness,↓ vision)
13- (von willebrandt 13 letters- so can’t break that down)
how do you approach an AKI
What does this ECG show?
How would you treat this
GLomerulonephritis table MEDED- less extensive than other flashcards
Fill in the table
What are causes of an AKI? annotate the diagram
What could causes these findings on a urine dip?
What are the differences between nephrotic and nephritis syndrome
What is this?
Polycystic ovary syndrome
SBA1
A
SBA 2
E
Diclofenac is a strong non-steroidal anti-inflammatory drug (NSAID) that is usually prescribed for muscular injury and renal colic. NSAIDs inhibit the production of prostaglandins, which are essential in maintaining renal perfusion. NSAIDs are therefore nephrotoxic and should be avoided in patients with known renal disease and in those at risk of renal disease, e.g. elderly people. Long-term use of NSAIDs may lead to analgesic nephropathy and chronic renal failure.
Analgesic nephropathy is injury to the kidneys caused by analgesic medications such as aspirin, phenacetin, and paracetamol. The term usually refers to damage induced by excessive use of combinations of these medications, especially combinations that include phenacetin. It may also be used to describe kidney injury from any single analgesic medication.
The specific kidney injuries induced by analgesics are renal papillary necrosis and chronic interstitial nephritis. They appear to result from decreased blood flow to the kidney, rapid consumption of antioxidants, and subsequent oxidative damage to the kidney. This kidney damage may lead to progressive chronic kidney failure, abnormal urinalysis results, high blood pressure, and anemia. A small proportion of individuals with analgesic nephropathy may develop end-stage kidney disease.
SBA3
D
SBA 3
E
Goodpasture’s syndrome is a rare condition in which autoantibodies are formed against the glomerular basement membrane and the alveolar membrane. The antibodies trigger a type II hypersensitivity reaction that causes renal failure, pulmonary haemorrhage and haemoptysis. The condition is usually diagnosed by the detection of anti-glomerular basement membrane antibody (anti- GBM) in the serum and via renal biopsy. The biopsy often shows focal or diffuse crescentic glomerulonephritis. Immunofluorescence may demonstrate linear deposition of IgG antibodies and complement (C3) on the glomerular basement membrane. Goodpasture’s syndrome is usually treated aggressively with plasmapheresis, corticosteroids and immunosuppression.
B.
Membranous glomerulonephritis is the most common cause of nephrotic syndrome in adults. In this condition, immune complexes are formed when circulating antibodies bind to basement membrane antigens or antigens deposited in the glomerulus from the circulation. The immune complexes activate an immunological response that involves the complement cascade. This response damages the glomerular basement membrane, making it more leaky to protein
Rapidly progressive glomerulonephritis – aka crescentic glomerulonephritis
3 main cause
- Immune complex-associated (SLE, IgA, post-infectious glomerulonephritis)
- Anti-GBM disease
- Pauci-immune crescentic glomerulonephritis (ANCA)
What is the triad of the nephrotic syndrome?
What are other symptoms
- proteinuria
- low serum albumine
- oedema
Liver tries to increase the production of albumin and at the same time produces more lipids (hyperlipidaemia)
loss of antithrombin 3 and hypogammaglobuliaemia leads to hypercoagulable state
What are common condition in adult and child that lead to a nephrotic syndrome
adults: membranous glomerulonephritis OR DM
children; minimal change glomerulonephritis
What is the nephritic syndrome triad
- Haematuria
- hypertenison
- oedema
CAST cells prove haematuria is glomerular
What are investigation and management of Glomerulonephritis?
Investigations:
- Bloods – FBC, U&Es, CRP, Complement, Autoantibodies
- Urine
- Imaging – renal US +/- renal biopsy
Management:
- Refer specialist
- BP management – <130/80
- ACE-I or ARB – reduce proteinuria and preserve renal function
- Steroids/immunosuppression
- Treat underlying cause
What is the most common renal cause of AKI?
acute tubular necrosis
What can renal tubular injury be due to?
ischaemia
nephrotoxic agents
What are exogenous and endogenous causes of acute tubular necrosis?
Exogenous:
- Drugs: NSAIDs, Aminoglycosides, amphotericin b, contrast media, calcineurin inhibitors, cisplatin etc.
Endogenous:
- myoglobinaemia (rhabdomyolysis),
- haemaglobinuria
- crystals
- myeloma
What is rhabdomyolysis?
What is the pathophysiology
What is the presentation
What are the investiagtions
What is rhabdomyolysis?
Skeletal muscle death
What is the pathophysiology
release of myoglobin, potassium and creatinine kinase (CK), obstruction of renal tubules - acute tubular necrosis
What is the presentation?
Muscle pain and swelling, dark urine (myoglobin)
What are the investiagtions
•Hyperkalaemia, High CK
What is the pathophysiology of Acute tubular necrosis due to ischaemia?
What are the 3 phases?
What is the pathophysiology of Acute tubular necrosis due to ischaemia?
- Ischaemia >
- Tubular cell injury >
- Necrosis >
- Obstruction of tubule by debris >
- ↓GFR
What are the 3 phases?
3 phases:
- INITIATION –acute ↓ GFR + ↑ Cr + ↑urea
- MAINTENANCE – sustained ↓ GFR (~1-2w) à Cr + urea ↑
- RECOVERY – tubular function regenerates à ↑urine volume + gradual ↓ urea + Cr
What cancer can cause acute tubular necrosis?
What is the pathophysiology?
What are the clinical features?
What cancer can cause acute tubular necrosis?
Malignant disease of bone marrow plasma cells which results in a clonal expansion of plasma cells - monoclonal paraprotein production
What is the pathophysiology?
free light chains of paraproteins precipitate in kidneys > inflammation
What are the clinical features?
CRAB
Calcium – HIGH
Renal failure (acute or chronic) - ↑ urea ↑ Cr
Why? Hypercalcaemia, paraprotein deposition
Anaemia
Bone – osteolytic bone lesions – pain, fracture (risk cord compression)
What are some nephrotoxic agents?
Examples:
- Analgesics e.g. NSAIDS
- Antibiotics e.g. aminoglycosides – gentamicin, streptomycin
•Contrast agents
- Anaesthetic agents
- Chemotherapeutic agents
•ACE-I and ARBs
•Immunosuppressants e.g. ciclosporin, MTX
What can cause interstial nephritis?
- Drugs
- Infections
- Immune disorders e.g. SLE
- Lymphoma
- Tumor lysis syndrome following chemo