Passmed Renal Mushkies Flashcards
What predisposes to increased thrombosis in nephrotic syndrome?
- Loss of antithrombin III, Protein C & S
2. Rise in fibrinogen levels
What Abxs require therapeutic monitoring in pts with renal failure?
Vancomycin and gentamicin
What are 4 drugs to avoid in renal failure?
- Abx e.g. tetracyclines, nitrofurantoin
- NSAIDs
- Lithium
- Metformin
What are some drugs that are likely to accumulate in CKD and thus need dose adjustment?
A MAD FOS
- Most Abx
- Methotrexate
- Atenolol
- Digoxin
- Furosemide
- Opioids
- Sulphonylureas
What is the management for acute clot retention?
Bladder irrigation via a 3-way urethral catheter
How can you classify haematuria?
Visible vs. non-visible haematuria
How can you classify causes of non-visible haematuria?
- Transient
2. Persistent
What are the transient causes of non-visible haematuria?
- UTI
- Menstruation
- Vigorous exercise
- Sexual intercourse
What are the permanent causes of non-visible haematuria?
- Infection = prostatitis, urethritis
- Inflammation = IgA nephropathy, thin basement membrane disease
- Malignancy = bladder, renal, prostate
- BPH
- Stones
What are some spurious causes of haematuria?
- Foods = beetroot, rhubarb
2. Drugs = rifampicin, doxorubicin
What is the definition for persistent non-visible haematuria?
Blood being present in 2 out of 3 samples tested 2-3 weeks apart
What are 4 features of HSP?
- Rash over buttocks and extensor surfaces
- Abdo pain
- Polyarthritis
- Features of IgA nephropathy e.g. haematuria, renal failure
What are stag-horn calculi typically composed of?
Struvite = Ammonium Magnesium Phosphate
What typically causes staghorn calculi?
Alkaline urine due to e.g. Proteus Mirabilis and Ureaplasma urealyticum
When is a triple phosphate stone defined as a staghorn calculus?
Whe nit involves the renal pelvis and extends into at least 2 calyces
How can one manage lupus nephritis?
- Treat HTN
- Corticosteroids if clinical evidence of disease
- Immunosuppressants e.g. azathioprine/cyclophosphamide
How can you differentiate between ATN or prerenal uraemia?
In prerenal uraemia the kidneys hold onto sodium to preserve volume
What is dialysis disequilibrium syndrome?
A rare complication usually affecting those who have recently started renal replacement therapy, causes cerebral oedema, but the exact mechanism is unclear. Therefore, this is a diagnosis of exclusion
What are the 3 different types of renal replacement therapy?
- Haemodialysis
- Peritoneal dialysis
- Renal transplant
What kind of things are taken into account by pt and the healthcare team when deciding which RRT to have?
- Predicted QoL
- Predicted life expectancy
- Pt preference
- Co-existing medical conditions
What are the 2 types of peritoneal dialysis?
- Continuous ambulatory peritoneal dialysis (CAPD)
2. Automated peritoneal dialysis (APD)
What is the average lifespan of a donated kidney?
10-12 yrs from deceased donors, 12-15 yrs from living donors
What is the average life expectancy of a pt with renal failure that does not receive renal replacement therapy?
6 months
How can you classify causes of metabolic acidosis?
Normal or raised anion gap
What are the causes of a normal anion gap metabolic acidosis?
- GI loss e.g. diarrhoea
- Renal tubular acidosis
- Drugs e.g. acetazolamide
- Ammonium chloride injection
- Addison’s disease
What are the causes of a raised anion gap metabolic acidosis?
- Lactate = shock, hypoxia
- Ketones = DKA, alcohol
- Urate = renal failure
- Acid poisoning = salicylates, methanols
What are some causes of metabolic alkalosis?
- Vomiting
- Diuretics
- Hypokalaemia
- Cushings
- CAH
- Primary hyperaldosteronism
What are some causes of a respiratory acidosis?
- COPD
- Resp condition e.g. asthma decompensation
- Drugs e.g. benzodiazepines, opiate overdose
What are some causes of a respiratory alkalosis?
- Anxiety
- PE
- CNS e.g. stroke
- Altitude
- Pregnancy
- Salicylate poisoning
What is a common for a rise in urea that is proportionally higher than the rise in creatinine?
Dehydration
What are 5 intrinsic causes of renal failure?
- Glomerulonephritis
- ATN
- AIN
- Rhabdyomyolysis
- Tumour lysis syndrome
How does one diagnose AKI?
- a rise in serum creatinine of 26 micromol/litre or greater within 48 hours
- a 50% or greater rise in serum creatinine known or presumed to have occurred within the past 7 days
- a fall in urine output to less than 0.5 ml/kg/hour for more than 6 hours in adults and more than
What 5 drugs should be stopped in AKI as it may worsen renal function?
- NSAIDs
- Aminoglycosides
- ACE inhibitors
- Ang II receptor antagonists
- Diuretics
What are 3 drugs that may have to be stoppefd in AKI as increased risk of toxicity but doesnt usually worsen the AKI itself?
- Metformin
- Lithium
- Digoxin
What is the potassium requirement per day?
1 mmol/kg/day
What is the sodium requirement per day?
1 mmol/kg/day
What is the chloride requirement per day?
1 mmol/kg/day
How much Na and Cl is in normal saline?
154mmol
How much Na and Cl is in Hartmann’s? How much K and HCO3 is in Hartmann’s?
Na = 131 Cl = 111 K = 5 HCO3 = 29
Why shouldnt you use Hartmanns in pts with hyperkalaemia?
It contains potassium
What are some complications of giving erythropoietin?
- Accelerated HTN –> encephalopathy and seizures
- Bone ache
- Flu-like symptoms
- Skin rashes, urticaria
- Pure red cell aplasia (due to Abs against EPO)
- Thrombosis
- Iron deficiency 2nd to increased erythropoiesis
What is the most common viral infection in solid organ transplant recipients?
CMV
How can you classify graft failure in renal transplant?
- Hyperacute rejection (mins to hrs)
- Acute graft failure (<6m)
- Chronic graft failure (>6m)
What causes hyperacute rejection of renal transplants?
Due to pre-existent Abs against donor HLA antigens (Type II Hypersensitivity reaction), and is rarely seen due to HLA matching
What causes acute graft failure?
Usually due to mismatched HLA, and is cell-mediated (cytotoxic T cells). Can also be caused by CMV infection. may be reversible with steroids and immunosuppressants
What causes chronic graft failure?
- Both antibody and cell mediated mechanisms causes fibrosis to the transplanted kidney
- Recurrence of original renal disease (MCGN > IgA > FSGS)
What are the causes of minimal change disease?
- Idiopathic (majority)
- Drugs = NSAIDs, rifampicin
- Hodgkins lymphoma, thymoma
- Infectious mononucleosis
What is the prognosis for minimal change disease?
1/3rd one episode
1/3rd infrequent relapses
1/3rd frequent relapses
What are 2 risk factors for urate stones?
- Gout
2. Ileostomy (loss of bicarb and fluid results in acidic urine, causing precipitation of uric acid)
What are 2 drugs that promote calcium stones?
Loop diuretics and steroids
What are 2 pertinent manifestations of uraemia?
Encephalopathy and pericarditis
What is the management of renal stones?
- Conservatively = pass spontaneously
2. Surgical = ESWL, percutaneous nephrolithotomy, ureteroscopy, open surgery
How do you manage calculi <5mm?
Expectant
How do you manage calculi <2cm?
ESWL
How do you manage calculi <2cm in pregnant women?
Ureteroscopy
How do you manage complex renal calculi and staghorn calculi?
Percutaneous nephrolithotomy
How can you prevent calcium stones?
- High fluid intake
- Low animal protein, low salt diet
- Thiazide diuretics
How can you prevent oxalate stones?
Cholestyramine and pyridoxine both reduce urinary oxalate excretion
How can you prevent uric acid stones?
- Allopurinol
2. Urinary alkalinisation e.g. oral bicarbonate
What is the mainstay of treatment for rhabdomyolysis?
Rapid IV fluid rehydration
What electrolyte changes do you see in rhabdomyolysis?
- Hypocalcaemia (myoglobin binds to calcium)
- High phosphate (released from myocytes)
- Hyperkalaemia
- Metabolic acidosis
- AKI with disproportionately raised creatinine
What is the triad for renal cancer?
Flank pain, mass and haematuria
What is the most common type of renal cancer?
Clear cell
What are some associations of renal cell carcinoma?
- Middle aged men
- Smokers
- vHL syndrome
- Tuberous sclerosis
What cancer can cause a left varicocoele?
Renal cell carcinoma due to occlusion of left testicular vein
What are 4 hormones that a RCC may secrete?
- EPO
- PTH
- Renin
- ACTH
What diagnosis should you consider in young female pts who develop AKI after the initiation of an ACE inhibitor?
Fibromuscular dysplasia
What is the most common cause of renal artery stenosis?
Atherosclerosis
What is fibromuscular dysplasia?
Proliferation of cells in the walls of the arteries causing vessels to bulge or narrow. ‘String of beads’ appearance.
Haematuria 1-2 days after an URTI?
IgA Nephropathy
Haematuria 1-2 wks after an URTI?
Post-streptococcal glomerulonephritis
What is the commonest cause of glomerulonephritis worldwide?
IgA nephropathy
What percentage of pts with IgA nephropathy develop ESRF?
25%
What are 4 extra-renal features of ADPKD?
- Hepatomegaly due to hepatic cysts
- Diverticulosis
- Ovarian cysts
- Berry aneurysms
- Mitral valve prolapse/aortic dissection
How might ADPKD present?
- HTN
- Recurrent UTIs
- Abdo pain
- Renal stones
- Haematuria
- CKD
What kind of blocker can be given to pts to aid passage of a stone?
Alpha blocker