PAEDS RENAL TO DO Flashcards
PROTEINURIA
What is proteinuria?
- Persistent proteinuria is significant + should be quantified by measuring the urine protein/creatinine ratio in an early morning sample
- Protein should not exceed <20mg/mmol of creatinine
PROTEINURIA
What are some causes of proteinuria?
- Transient (febrile illness, after exercise = no investigation)
- Nephrotic syndrome
- HTN
- Tubular proteinuria
- Increased glomerular perfusion pressure
- Reduced renal mass
NEPHROTIC SYNDROME
What is nephrotic syndrome?
Who is it most common in?
- Basement membrane in the glomerulus becomes highly permeable to protein, allowing proteins to leak from blood into the urine
- 2–5y
NEPHROTIC SYNDROME
What are the signs needed in order to make a diagnosis of nephrotic syndrome?
- Heavy proteinuria (>1g/m^2/24h)
- Hypoalbuminaemia (<25g/L)
- hypercholesterolaemia
NEPHROTIC SYNDROME
What is the pathophysiology of nephrotic syndrome?
- Inflammation – from immune cells (Ab’s, Ig’s - IgG), complement proteins, HTN, atherosclerosis, medications/immunisations, infection
- Damage to podocytes – protein leakage (albumin, Ab’s)
- Increased liver activity – to increase albumin, - Consequential increase in cholesterol + coagulation factors
- Reduced oncotic pressure – oedema - Consequential blood volume decrease, RAAS stimulation, exacerbation
NEPHROTIC SYNDROME
What are the 3 main types of nephrotic syndrome?
- minimal change disease
- membranous glomerulonephritis
- focal segmental glomerulosclerosis
NEPHROTIC SYNDROME
What is minimal change disease?
- Most common cause in children with no underlying pathology
NEPHROTIC SYNDROME
what is the main symptom of nephrotic syndrome?
Pitting oedema - periorbital, ascites, peripheral
NEPHROTIC SYNDROME
what can cause minimal change disease?
- NSAIDs,
- Hodgkin’s lymphoma,
- infectious mononucleosis
NEPHROTIC SYNDROME
Who does minimal change disease present in?
- M>F,
- commoner in Asian children than Caucasians,
- do not progress to renal failure
NEPHROTIC SYNDROME
What are the features of minimal change disease?
- 1–10y
- No macroscopic haematuria
- Normal BP, complement levels, renal function
- Often precipitated by resp infections
- 1/3 resolve, 1/3 infrequent relapses, 1/3 frequent relapses
NEPHROTIC SYNDROME
what is the epidemiology of congenital nephrotic syndrome?
- First 3m of life, rare, high mortality
NEPHROTIC SYNDROME
what is the inheritance pattern of congenital nephrotic syndrome?
Recessive inheritance with increased incidence in Finnish (UK = consanguinity)
NEPHROTIC SYNDROME
what are the clinical features of congenital nephrotic syndrome?
Albuminuria so severe may need unilateral nephrectomy then dialysis for renal failure until renal transplant
NEPHROTIC SYNDROME
What is the clinical presentation of nephrotic syndrome?
- Frothy urine (significant proteinuria)
- Generalised oedema (pitting + gravitational), can be periorbital (esp on waking)
- May have scrotal, vulval, leg + ankle oedema too
- Pallor, breathlessness (pleural effusions) + abdo distension (ascites)
NEPHROTIC SYNDROME
What are some investigations for nephrotic syndrome?
- Urinalysis (proteinuria + microscopic haematuria)
- Urine MC&S (infection)
- Renal function (U+Es, creatinine, albumin, urinary Na+ concentration)
- Lipid profile
- Systemic disease screen
- Antistreptolysin O or anti-DNAse B titres + throat swab
- Renal biopsy for histology if no steroid response
NEPHROTIC SYNDROME
In nephrotic syndrome, what are you looking for with the lipid profile?
Deranged (hyperlipidaemia, hypercholesterolaemia)
NEPHROTIC SYNDROME
In nephrotic syndrome, what are you looking for with the systemic disease screen?
FBC, CRP/ESR, complement (C3/4) levels, autoimmune screen, hep B/C screen, malaria if abroad
NEPHROTIC SYNDROME
In minimal change disease, what are you looking for with the renal biopsy?
Minimal change disease shows normal glomeruli on light microscopy but fusion of podocytes + effacement of foot processes on electron
NEPHROTIC SYNDROME
What are some complications of nephrotic syndrome?
- Hypovolaemia as fluid leaks from intravascular to interstitial space
- Thrombosis due to loss of antithrombin III
- Infection due to leakage of immunoglobulins, weakening the immune system + exacerbated by Tx with steroids
NEPHROTIC SYNDROME
What is the general management of nephrotic syndrome?
- Strict fluid balance with restriction, no added salt
- Tx hypovolaemia if present but albumin infusion is not routine
- Diuretics if very oedematous + no evidence of hypovolaemia
- Prophylactic PO penicillin V until oedema-free
- PCV vaccine
NEPHRITIC SYNDROME
What is nephritic syndrome?
- Acute nephritis is inflammation within the nephrons of the kidneys
- This leads to reduction in kidney function, macroscopic haematuria + proteinuria
NEPHRITIC SYNDROME
What are some causes of nephritic syndrome?
- Post-streptococcal glomerulonephritis
- IgA nephropathy (Berger’s disease)
- Vasculitis (HSP, SLE, Wegener’s, polyarteritis nodosa)
- Goodpasture’s syndrome
- Familial nephritis (Alport’s syndrome)
NEPHRITIC SYNDROME
What is post-streptococcal glomerulonephritis?
- Nephritis after group A beta-haemolytic strep pyogenes illness (tonsillitis)