Renal Flashcards
A 5-year-old boy presents with a short history of facial oedema that has now progressed to total body swelling involving the face, abdomen, scrotum, and feet. Other symptoms include nausea, vomiting, and abdominal pain. The parents report that the child had a viral illness with fever a few days before the development of the swelling. On examination, he has facial oedema, ascites, scrotal oedema, and pitting oedema of both legs up to the knees.
minimal change nephropathy
A 42-year-old white man with no previous medical history presents to his primary care physician with progressively increasing oedema of both lower extremities. There is no family history of renal failure. The patient has pitting pedal oedema. Urinalysis reveals marked proteinuria (3+).
FSGS
A 48-year-old man presents to his family doctor with a recent lower-extremity swelling that is gradually worsening. Over the last few weeks, he has also noticed puffiness under his eyes. A urinalysis demonstrates significant proteinuria, and a 24-hour urine collection confirms proteinuria of 12 g. He has no history of diabetes, macroscopic haematuria, or hypertension.
membranous nephropathy
A 50-year-old man with a 15-year history of type 2 diabetes presents with oedema, fatigue, and impaired sensation in the lower extremities. He is found to have proteinuria, a reduced eGFR, anaemia, background diabetic retinopathy, and peripheral neuropathy
diabetic nephropathy
A 23-year-old white man with an unremarkable past medical history presents to the clinic for a routine physical examination including a urine analysis required for his job. This shows invisible haematuria and mild proteinuria. The physical examination reveals no significant abnormal findings
IgA nephropathy, berger’s
A 41-year-old woman is discharged from hospital following a diagnosis of community-acquired pneumonia, to be managed at home on amoxicillin. A day later she returns to the emergency department with a low-grade fever, widespread erythematous rash and pain throughout her joints and lower back, with her initial bloods showing a significantly elevated creatinine.
AIN
A 20-year-old woman presents with a 5-day history of painless light brown coloured urine. She has experienced 3 episodes of this over the 5 days. There is no dyspareunia, urgency or pain elsewhere. As of now, she is afebrile though she alludes to being ill with a respiratory infection around three weeks ago.
post strep GN
A concerned mother attends your GP surgery with her 7-year-old son. She is very concerned as she reports that ‘there is blood in his urine.’ Urine dipstick is ++++ for blood with no leukocytes, nitrates or protein. The boy reports that he first noticed the haematuria this morning. Physical examination is unremarkable, with normal heart and lung sounds and a soft non-tender abdomen. He is afebrile and does not have any symptoms of a urinary tract infection. His past medical history is unremarkable but his mother reports that he recently had a cold 2 days prior and has had several colds over the past year.
IgA nephropathy
5 causes of nephrotic syndrome
primary glomerular disease
- minimal change
- FSGS
- membranous nephropathy
systemic
- diabetes
- amyloidosis
nephritic syndrome causes
- post-strep glomerulonephritis
small vessel vasculitis
anti GBM disease
iga nephropathy
causes of crescenteric nephritis or RPGN
- SVV small vessel vasculitis
- SLE
- anti GBM good pasture’s
- aggressive phase of other inflammatory nephritis
acute intersitial nephritis causes AIN
Allergic
- drug
- autoimmune
Infective
-Toxic- noxious
chronic interstitial nephritis causes
- AIN where the cause continues
- in assoc. with glomerulonephritis
- allergic/ immune- sarcoidosis, autoimmune-sjorgen
- infective
- toxic Ig light chains, heavy metals, Li
- development/ congenital - reflex nephropathy and renal dysplasias
- inhertied- metabolic, nephrocalcinosis
- ischaemia/ papillary necrosis- sickle cell, analgesic nephropathy
haematuria causes
UTI stones tumours prostate gland disease -glomerulonephritis schistosomiasis
- not haematuria
- menstruation
- dyes in food
- transient haematuria from strenuous exercise
- if on warfarin more likely to get more significant
signs of glomerulonephritis
haematuria proteinuria one of blood pressure oedema
visible haematuria management
-exclude menstruation/ UTI
check BP, renal function
refer to urology for USS/ CT renal tracts/ cystoscopy
persistent non visible haematuria diagnosis
need 2 out of 3 positive dipsticks
exclude menstruation and UTI
persistent non visible haematuria and normal renal function and BP but over 40
refer to urology
persistent non visible haematuria and normal renal function and BP but under 40 and symptomatic
refer to urology
persistent non visisble haematuria and normal renal function and BP but under 40 and not symptomatic
keep under observation
-annual urinalysis and renal function and BP check
persistent non visible haematuria and abnormal renal function and BP
refer to renal
persistent non visible haematuria and fhx of renal disease or evidence of systemic disease
refer to renal
inx options for haematuria
-hx
-urinalysis
-urine culture
-urine microscopy
BP
-renal function
-urine ACR
all patients >40 and persistent non visible haematuria get cystoscopy and imaging along with visible haematuria patients
who to send to renal for haematuria
- hx of fhx of renal disease
- evidence of systemic disease
- abnormal BP or renal function
what is loin pain haematuria syndrome
-name given to the syndrome in which people suffer loin or flank pain and have blood in their urine, in whom no other cause is found
types of oedema
-localised
generalised- ascites, pleural effusion, facial - can with increased severity be in the genitalia and abdomen
inx for oedema
hx and exam
urinalysis
bloods- labumin
4 mechanisms of oedema
increased ECF
increased hydrostatic pressure
increased capillary permeability
lowered oncotic pressure
what can cause increased ECF
- sodium retention by kidneys renal failure
- heart failure
- nephrotic syndrome- low albumin
- liver failure
signs of general increased in hydrostatic pressure
-venous pressure is high in heart or renal failure
raised JVP
nephrotic syndrome - except get a normal JVP as intravascualr deplete
signs of local increased in hydrostatic pressure and cause
-venous pressure will be raised by DVT or venous insufficiency or by extrinsic obstruction such as pregnancy or tumour
-non pitting localised oedema- lymphoedema
also some infections, malignancy and radiation
causes of increased capillary permeability
infection
sepsis
protein leaks into the interstuitium which reduces the oncotic pressure gradient so draws fluid out
lowered oncotic pressure of blood
- low serum albumin due to reduced synthesis or increased loss
- assoc. with avid sodium retention by the kidneys
- liver failure is reduced synthesis
- nephrotic syndrome- increased loss of proteins
- malnutrition reduced synthesis
hold onto fluid
management of oedema
diuretics
salt and fluid restriction depending
compression
unilateral leg oedema suggests
a mechanical problem
oedema with hyponatraemia suggest
whole body sodium is increased but water is increased more - hypervolaemic hyponatraemia so needs restriction of water and salt but caution diuretics
proteinuria what does it signify
renal disease
-protein in the urine always comes from the kidney
three main causes of proteinuria
-glomerular disease
increased protein production
low reabsorption at proximal tubule
main causes of proteinuria
- nephrotic syndrome
- glomerular disease -glomerulonephritis, diabetes
- CKD
- autoimmune- lupus, goodpasture
- urine infection
- systemic- congestive heart failure, eclampsia
- dehydration
- htn
less important causes of proteinuria
-fever
strenuous exercise
absent in the morning but occurs in the later in the day-orthostatic proteinuria
occurs only during a urine infection
inx proteinuria
-dipstick urine
indication for further inx of proteinuria
-proteinuria >100
haematuria- think glomerulonephritis
-raised serum creatnine/ low eGFR
-HTN
-symptoms of systemic disease eg vasculitis such as rash, arthralgia
-previous hx or fhx suggesting significant renal disease
further inx for proteinuria
quantify proteinuria creatinine
urine albumin creatinine ratio
uss of kidneys
consider referral renal biopsy
what is assoc, to proteinuria
cardiovascular disease
quantification of proteinuria inx
-PCR or ACR urine
what is normal protein loss in urine
about 0.3g/day
but virtually no albumin
management of low level proteinuria
-absence of heavy proteinuria <1g day, haematuria, HTN, renal function, symptoms: monitor urine test and renal function at 6 month intervals
> 1g consider renal biopsy
see flow chart
voiding symptoms
persistent dribbling intermittent stream straining hesitancy poor flow bladder outflow obstruction double voiding
storage symptoms
frequency
urgency
nocturia
incontinence
end stage renal failure symptoms
-thirst twitching pallor fatigue nausea vomiting bone pain breathlessness pigmentation coma confusion
causes of haematuria
-cysts
-tumours
-vascular malofrmations
-glomerular disease
0interstitial disease
-infection
-cancer
-stones
-trauma
-clotting disorders
-excerise
malnutrition
def of oliguria
<400
anuria def
<100
causes of oliguria/ anuria
urinary obstruction eg prostate, tumour, stone
lack of renal perfusion- aortic dissection
RPGN
AKI stage 1 is
creatinine >1.5-1.9
urine <0.5 for >6 hours
AKI stage 2
creatinine 2-2.9
urine <0.5 for 12 hours
AKI stage 3
> 3 creatinine
urine <0.3 for 24 hrs or anuric 12 hours
how do NSAIDs act at as predisposing drugs to AKI
NSAIDS inhibit prostaglandin production which inhibits the dilatation of the afferent arteriole
which is aimed at increasing glomerular pressure
how do ACEi act as predisposing drugs to AKI
ACEi inhibit angiotensin II production which prevents constriction of the efferent arteriole
which is aimed at increasing glomerular pressure
causes of AKI
usually multifactorial
-dehydration- SEVERE hypovolaemia
pre-existing renal damage
predisposing drugs
overall get decreased glomerular pressure that is required for proper filtration
predisposing drugs to AKI
-ACEi NSAID aminoglycosides diuretics IV contrast
classification of AKI
-pre-renal
renal
post-renal
pre renal causes for AKI
- circulation- systemic and local (RAS)
- bp
- cardiac ouput
- sepsis
- fluid balance reduced
- reduced arterial circualtion
- intrarenal microcirculation
- blood loss
- dehydration
- vascular occlusion
inx for AKI
- renal u and e
2, urinalysis - renal USS
INX findings for pre-renal AKI
urine osmolality increases
sodium urine decreases- hold onto sodium
serum urea: creatinine increases
intrinisc renal AKI causes
- ATN acute tubular necrosis-prolonged pre-renal
- inflammation: glomerulonephritis, interstitial nephritis, pyelonephritis
- vascular- renal vein thrombosis, cholesterol emboli, renal infarction, malignant hypertension, recent angiography
Acute tubular necrosis pathology
-get an injury to the tubule which leads later to necrosis of the tubule and fibrosis
intrinisic renal AKI inx findings
urine osmolality decreased
urine sodium increased- loose sodium
post-renal AKI causes
- neurological
- stones, crystals blocking
- kidneys, bladder
approach to the patient with oliguria
- is it real- check bladder recordings?
- check circulation
- fluid balance
- drug chart
- previous result and hx
- uss and dipstick
elevated creatinine diff dx
- aki
- ckd
- aki on background of ckd
KDIGO criteria for AKI 3
- increase in serum creatinine by >26.5 micromol within 48 hours
- increase in serum creatinine by >1.5 x baseline within the prior seven days
- urine volume <0.5ml/kg for >6 hours
what suggest a dx of AKI rather than CKD
- normal kidney size on USS
- normal haemoglobin (RBC half life 120 days so wont be acute presentation)
- normal PTH (also takes time to develop)
if in doubt assume AKI and inx promptly
pre renal AKI clinical features
-hypotensive, tachycardic, poor peripheral perfusion, delayed CRT, postural hypotension
management of pre-renal AKI
-fluid resus will work providing tubules intact
acute tubular necrosis causes
- when hypotension is very severe or prolonged, ATN may develop due to ischaemic injury
- prolonged pre-renal goes onto develop ATN
which is when urinary sodium begins to increase and osmolality decrease as can no longer absorb sodium and water back through tubules
also toxic causes
- drugs- aminoglycosides, cisplatin, tenofovir, methotrexate, iodinated contrast
- rhabdomyolysis
- myeloma light chains
- crystals
management of ATN
- fluid resuscitiation aggressive and early
- once ATN has developed fluid resus alone will not be enough as kidney tubules take time to regenerate
mortality ATN
50% due to assoc. organ failure
Anti GBM immunofluorescence presentation
ribbon pattern
immune complex deposition disease presentation
immunofluorescence
granular or starry sky pattern
vasculitis immunofluorescence presentation
negative
causes of RPGN
-vasculitis
anti GBM
post-infectious glomerulonephritis
post renal AKI causes
-obstruction
to flow in renal tract- NEEDS TO BE BILATERAL
-Most likely benign prostatic hypertrophy
-also tumours, external compression
presentaton of post-renal AKI
-anuria
or
-polyuria
systematic approach to patient with AKI
- is the AKI renal- check renal function
- could it be pre-renal failure
- access circualtory state eg BP,JVP, mucous membranes, check fluid balance, check medications eg any new medications - could it be post-renal
-bladder palpable?
-person at high risk eg male >60, hx of bladder cancer, loin pain, visible haematuria
order USS scan - could it be an intrinsic renal cause
Toxic ATN
AIN-eosinophilic count and leucocytes
glomerulonephritis- blood and protein
management of established AKI
-drug chart stop nephrotoxic drugs
-fluids
control intake of fluid, resus, match sodium loss, no potassium initially
-hyperkalaemia management
-acidosis give sodium bicarb if pH<7
-diet: low protein and phosphate
-prevent infection
-consider PPI reduce risk Upper GI bleeds
-treat obstruction if needed
others
-dialysis
what drugs need stopping in AKI
-NSAID
-AceI
-AMINOGLYCOSIDES
-ARB
diuretics
metformin
lithium
digoxin
indications in AKI for dialysis8
- dangerous hyperkalaemia
- pulmonary oedema
- severe symptoms or complications
- poor biochemical results and unlikely to recover function quickly
- pericarditis
- neurological signs eg uraemic encephalopathy
- need for high fluid intake eg for nutrition during oliguria
- to enable nutrition
dialysis of choice for AKI
haemodialysis
why is there a polyuric phase after AKI
-excess electrolytes and fluid retained during AKI but also because the tubules are recovering from injury so are less responsive to ADH/ ang so dont appropriately retain salt and water
management of after AKI Fluid
-rough guide is to ensure total fluid is equal to urinary volume from the day before
unless signs of overload
may also need to supplement bicarb, potassium
prognosis of AKI after
- full recover
- acute on chronic disease
- AKI to ESRD
what do people with AKI die of 4
- hyperkalaemia
- pulmonary oedema
- uraemia
- infection
long term risks of aki
- recover often incomplete
- long term increased risk of ESRF
- poor outcomes are more likely with increasing severity and duration of the insult
biopsy sign of ATN
vacuolation
rf for aki
chronic kidney disease
other organ failure/chronic disease e.g. heart failure, liver disease, diabetes mellitus
history of acute kidney injury
use of drugs with nephrotoxic potential (e.g. NSAIDs, aminoglycosides, ACE inhibitors, angiotensin II receptor antagonists [ARBs] and diuretics) within the past week
use of iodinated contrast agents within the past week
age 65 years or over
CKD stages
1 >90 2 60-90 3 30-60 4 15-30 5 <15
eGFR variables
cage Creatinine age gender ethnicity
dx of CKD
eGFR of <60 on at least 2 occasions 90 days apart
abnormalities of kidney function or structure present for more than 3 months
irereversible deterioration of renal function
main causes of CKD
diabetes mellitus interstitial disease glomerular disease hypertension systemic inflammatory disease renovascular disease cogenital and inherited unknown
clinical features CKD
<15 gfr -tired breathless renal anaemia pruuritus anorexia weight loss n and v
risk factors for developing ESRD
-severity proteinuria haematuria high BP young age
inx
blood tests urinalysis and proteinuria ACR HEPATitis testing renal USS CT/ MRI angiography
referral CKD to nephrologist
- eGFR <30
- rapid deterioration >25% from past yr
- significant proteinuria unless known to be due to diabetes ACR >70
- ACR >30 with non visible haemturia
- HTN that remains poorly controlled despite 4 medications
- suspicion of renal involvement in multisystem disease
AKI def
1.5 x baseline 7days
cr 26.5 in 48hrs
0.5 urine for 6hrs ?
when to refer to renal unit -immediate
suspect acute renal failure oliguria obstruction ARF on CRF severe new renal failure
cause ckd 4-5
often multifactorial diabetes and renal artery stenosis inflammation eg glomerulonephritis circulatory obstruction inherited eg pkd
management CKD 3
-assess- features, urinalysis, medication, PMH
-monitoring: aim to keep BP <140/90
management of CVD- stain
refer for specialist
-proteinuria
haematuria
rapid deteriorating renal function
young age
fhx of renal failure
poorly controlled HTN
CKD managemenet
-BP control <130/80 if albuminuria ACEi if proteinuria bicarbonate for acidosis dietary avoid potassium salt restriction avoid high protein diet
complications of CKD
-HTN potassium acidosis anaemia renal osteodystrophy CVD risk malnutrition
acidosis rx in ckd
sodium bicarb
avoid too much protein
anaemia of ckd is
normochromic normocytic anaemia
make sure from renal and not another cause
anaemia pathology CKD
recombinant EPO
IV iron
-definiciency of EPO
decreased response to EPO, toxic effect of uraemia, reduced RBC survival
renal osteodystrophy pathology
low vitamin D
high PTH- high phosphate levels stimualte PTH
decreased calcium absortion
osteoclastic bone resporption
rx of renal bone disease
phosphate binders eg calcium carbonate
calcitriol alfacalcidol
drugs to stop taking on sick days
ACEi ARB NSAID diuretics metformin
indications for dialysis
fluid overload- acute pulmonary oedema hyperkalaemia uraemia-encephalopathy metabolic acidosis bleeding diathesis
ESRD options
conservative treatments
dialysis