Renal Flashcards
How can you prevent calcium stones?
This is caused by hypercalcuria hence you can:
- High fluid intake
- Add lemon juice to water
- Avoid carbonated drinks
- Limit salt intake
- K citrate may be useful
- Thiazide diuretics - increases distal tubular ca resorption ***
How can you prevent oxalate stones?
cholestyramine reduces urinary oxalate secretion
pyridoxine reduces urinary oxalate secretion
How can you reduce uric acid stones?
allopurinol
urinary alkalinization e.g. oral bicarbonate
podocyte fusion and effacement of the podocyte foot processes on renal biopsy
What diagnosis?
Mx?
Minimal change disease
mx- oral corticosteroids (80% of cases) -> cyclophosphamide in steroid resistant cases
What does focal segmental glomerulosclerosis cause?
cause of nephrotic syndrome and chronic kidney disease
typically presents in younger adults
What are some causes of focal segmental glomerulosclerosis?
idiopathic
secondary to other renal pathology e.g. IgA nephropathy, reflux nephropathy
HIV
heroin
Alport’s syndrome
sickle-cell
Also high recurrence rate in renal transplants
What are the main extra-renal manifestations of ADPKD?
Liver cysts - 70% most common feature
Berry aneurysms - can rupture -> SAH
CVS - MV prolapse, M / T valve incompetence, aortic root dilatation, aortic dissection
Cysts in other organs - pancreas, spleen
Rarely - thyroid, oesophagus and ovary
In children presenting suspectingly for minimal change disease what is mx?
1st line oral pred
If steroid non-responsive, high suspicion of alternative diagnosis or declining renal func (on calcuerin inhibitor) -> renal biopsy
Which immunosuppression can cause tremor?
Tacrolimus
Which renal stones are radio-opaque?
Calcium oxalate
Mixed calcium oxalate / phosphate
Triple phosphate
Calcium phosphate
Which renal stones are radio-lucent?
Urate stones
Xanthine stones
Which renal stones are semi-opaque? what do they look like?
Cystine stones - ground glass appearance
Why do you get mineral bone disease in ckd?
Basic problems in chronic kidney disease (CKD):
> 1-alpha hydroxylation normally occurs in the kidneys → CKD leads to low vitamin D
> the kidneys normally excrete phosphate → CKD leads to high phosphate
This, in turn, causes other problems:
> the high phosphate level ‘drags’ calcium from the bones, resulting in osteomalacia
> low calcium: due to lack of vitamin D, high phosphate
> secondary hyperparathyroidism: due to low calcium, high phosphate and low vitamin D
How is mineral bone disease risk reduced in CKD?
The aim is to reduce PO4 and PTH levels.
reduced dietary intake of phosphate is the first-line management
phosphate binders
vitamin D: alfacalcidol, calcitriol
parathyroidectomy may be needed in some cases
MoA of Spironolactone?
Aldosterone antagonist: acts on the cortical collecting ducts as a diuretic via inhibition of mineralocorticoid receptor
What is the most common type of glomerulonephritis in adults? how does this present / biopsy
Membranous glomerulonephritis - third most common cause of ESRF
Nephrotic syndrome / proteinuria
What are the causes of membranous glomerulonephritis?
idiopathic: due to anti-phospholipase A2 antibodies
infections: hepatitis B, malaria, syphilis
malignancy (in 5-20%): prostate, lung, lymphoma, leukaemia
drugs: gold, penicillamine, NSAIDs
autoimmune diseases: systemic lupus erythematosus (class V disease), thyroiditis, rheumatoid
Young female, hypertension and asymmetric kidneys → what diagnosis?
Fibromuscular dysplasia
HTN is secondary to renal artery stenosis (this is the 2nd most common cause after renal vascular disease)
Why does lithium cause DI?
Causes nephrogenic DI - densitises kidneys ability to respond to ADH in collecting ducts
Features of Goodpasture syndrome?
Goodpastures syndrome = Anti-GBM disease - small vessel vasculitis associated with:
pulmonary haemorrhage
rapidly progressive glomerulonephritis
this typically results in a rapid onset acute kidney injury
nephritis → proteinuria + haematuria
Ix findings in Goodpastures syndrome?
renal biopsy: linear IgG deposits along the basement membrane
raised transfer factor secondary to pulmonary haemorrhages
Anti-GBM antibodies
Main mx for rhabdomyolysis?
IV fluids
Urinary alkalinization used sometiems
Which drugs to stop in AKI?
DAMN
D diuretics
A ace/ arbs + aminoglycosides (eg gent)
M metformin
N nsaids except aspirin at low dose 75mg
What are some adverse effects associated with aldosterone antagonists? how can you reduce this risk?
Hyperkalaemia
Gynaecomastia - less common with eplerenone (more selective with less afinity for androgen receptors)
Which medication can be used in ADPKD and when?
Tolvaptan (Vasopression receptor 2 antagonist) - slows progression of cyst development + renal insufficiency to be used if:
> CKD 2 /3 at start of tx
> Evidence of rapidly progressive disease
> + company provides it with discount agreed in patient access scheme
In hyperkalaemia which medications can be used to remove K from the body?
Calcium resonium (oral / enema) -> enema more effective than oral as K is secreted by rectum
Loop diuretics
Dialysis - considered in patients w AKI and persistent hyperkalaemia
What are the indications for renal replacement therapy in AKI?
The following if refractory to medical mx:
1. Hyperkalaemia
2. Met acidosis
3. Sx or complications of uraemia - pericarditis / encephalopathy
4. severe pulmonary oedema
Screening test for ADPKD?
USS Urinary system
clinically is characterized by fever, deranged transaminases, leukopenia and thrombocytopenia
Important to consider in those with renal transplant recipients
Diagnosis? Ix? Mx?
CMV infection
Ix - Viral PCR
Mx - Ganciclovir
Which condition can cause AKI following initiation of ACEi
Younger females?
Older patients?
Younger females - Fibromuscular dysplasia
Older - Atherosclerosis of renal arteries
What are the biopsy findings in Amyloidosis?
Congo red stain shows apple-green birefringence under polarised light
What are the features of acute interstitial nephritis?
What is a common cause?
Sterile pyuria and white cell casts in the setting of rash and fever is suggestive of acute interstitial nephritis - also eosinophilia
Commonly due to abx therapy (penicillins , rifampicin, NSAIDs, allopurinol, furosemide)
What blood results should have you considering rhabdomyolysis?
Lactic acidosis
Hyperkalaemia
+ features of ATN
What are the features of HIV-associated nephropathy (HIVAN)
There are five key features of HIVAN:
> massive proteinuria resulting in nephrotic syndrome
> normal or large kidneys
> focal segmental glomerulosclerosis with focal or global capillary collapse on renal biopsy
> elevated urea and creatinine
> normotension
Alport syndrome - inheritance?
X-linked dominant
Man like alport is dominant in the air, got that x factor
What is Calciphylaxis? when is it seen? what increases risk of this?
Rare complication of ESRF -> deposition of ca in arterioles -> microvascular occlusion + necrosis of tissue hence presenting with painful necrotic skin leisons
Risk is seen with:
Hypercalaemia, hyperphosphataemia + hyperparathyroidism
Warfarin can cause / exacerbate in high risk patients
tx involves reducing levels of this and controlling hyperparathyroidism + avoiding contributing drugs
HLA matching for renal transplants which are the most important HLA antigens?
when HLA matching for a renal transplant the relative importance of the HLA antigens are as follows DR > B > A
DR Berry Aneurysm
Indications for use of spironoloactone?
ascites: patients with cirrhosis develop a secondary hyperaldosteronism. Relatively large doses such as 100 or 200mg are often used
hypertension: used in some patients as a NICE ‘step 4’ treatment
heart failure - NYHA III + IV already on ACEi (reduces all cause mortality)
nephrotic syndrome
Conn’s syndrome
Most common cause of peritonitis secondary to peritoneal dialysis?
Coagulase -ve staph eg staph epidermis (also staph aureus)
What murmur is associated with mitral valve prolapse?
late systolic murmur accompanied by a mid-systolic click
What are some possible complications of nephrotic syndrome?
> Increased VTE risk due to loss of antithrombin III and plasminogen - DVT, PE or renal vein thrombosis -> sudden decline in renal func.
hyperlipidaemia - increased risk of ACS + Strokes
CKD
Increased risk of infection due to Ig loss
Hypocalcaemia secondary to Vit D and binding protein loss
What electrolyte changes cause nephrogenic DI?
Hypercalcaemia
Hypokalaemia
RFs for urothelial (transitional cell) caricinoma of bladder?
Smoking
Aniline dyes
Rubber manufacturing
Cyclophosphamide
RFs for SCC of bladder?
Smoking
Schistosomiasis
History of chronic sinusitis, haemoptysis + microscopic haematuria + raised IFMs
cANCA +ve
What is the diagnosis? what kidney disease does this cause? renal biopsy shows what?
Granulomatosis with polyangiitis (GPA), formerly known as Wegener’s granulomatosis
Causes rapidly progressive glomerulonephritis - cresenteric glomerulonephritis
How can you distinguish between prerenal uraemia and ATN?
Urinary sodium:
- Prerenal uraemia -> kidneys respond to reduced perfusion by conserving Na hence low urinary Na
- ATN -> kidneys can’t reabsorb Na hence high urinary Na
When does PSGN and IgA nephropathy develop ?
PSGN develops 1-2 weeks after URTI.
IgA nephropathy develops 1-2 days after URTI