Kidney conditions Flashcards
drug history questions for kidneys (6)
gentamicin vancomycin beta blockers ACE inhibitors/ARBs diuretics NSAIDs
arrhythmia associated wit hyperkalaemia (significant in renal disease)
peaked T waves
classic presentation of nephritic syndrome (4)
hypertension
oliguria
oedema (not periorbital)
haematuria
classic presentation of nephrotic syndrome (4)
Oedema (periOrbital) = nephrOtic
prOteinuria
hypoalbuminaemia
hypercholesterolaemia
aetiology of most nephrotic syndrome
glomerulonephritis (glomerular damage)
what investigation would you do for someone presenting with nephrotic syndrome
(think about likely cause)
renal biopsy
most common cause of chronic kidney disease (CKD)
diabetic nephropathy
aetiology of chronic kidney disease (CKD)
basically anything that affects the kidneys for a long time
definition of chronic kidney disease (CKD)
reduced kidney function and/or evidence of kidney damage >3months
what colour of skin may someone have with chronic kidney disease (CKD)
why
lemon yellow
from urea
common presentation of chronic kidney disease (CKD) (3)
fatigue
weight loss
nocturia
loads of things
G1 stage CKD criteria
GFR >90 but evidence of kidney damage
G2 stage CKD criteria
GFR 60-89
G3a stage CKD criteria
GFR 45-59
G3b stage CKD criteria
GFR 30-44
G4 stage CKD criteria
GFR 15-29
G5 stage CKD criteria
GFR <15 established renal failure
how many measurements how far apart of GFR do you need for chronic kidney disease (CKD)
2 measurements 90 days apart
what 3 things on urinalysis would you do/look for for someone with CKD
why
proteinuria
haematuria
albumin creatinine ratio (ACR)
find out cause of CKD
investigations for CKD (3)
creatinine/GFR
urinalysis
imaging (US if renal, MR angiogram if prerenal, CT if post renal)
at what stage should you refer CKD to renal specialist (probs for dialysis)
G3 - if progression (25% drop in GFR) or young
G4
G5
definitive treatment for CKD G5
renal replacement therapy (haemodialysis, peritoneal dialysis, transplant)
contraindication of ACE inhibitors in renal disease
bilateral renal artery stenosis
conservative treatment of CKD if G1-G4 (4)
ACE inhibitors/ARBs to reduce BP
statins for CVD
fluid restriction/diuretics
lifestyle modification - reduce K, PO4, salt
BP target in CKD
<130/80mmHg
what happens to vitamin D in CKD (chronic kidney disease)
what does this cause
vit D is not hydroxylated = so is inactive
CKD mineral bone disease
if vit D is not hydroxylated in CKD, what happens to Ca
what does this result in (hormones)
reduced Ca absorption in bones
high serum Ca binds with high serum phosphate
= calcium phosphate = serum Ca decreases
secondary (also tertiary from high PO4 bc bone doesnt excrete it as normal) HYPERparathyroidism
presentation of mineral bone disease in CKD (4)
fractures
bone pain
osteomalacia
vascular/soft tissue/bone calcification
treatment of mineral bone disease in CKD (3)
think about the 2 problems
decrease PO4 in diet (chocolate)
alfacalcidol (already hydroxylated vit D)
phosphate binders eg calcium carbonate
why may someone with CKD present with anaemia
kidneys produce EPO (erythropoietin) so in CKD = decreased EPO = decreased RBC = anaemia
definition of acute kidney injury (AKI) (4)
include creatinine and urine (and 2 other)
abrupt (<48 hours) reduction in kidney function
increase in creatinine >50%
reduction in urine <0.5ml/kg/hour
no response to fluid resus
is acute kidney injury (AKI) common
very
what are the 3 categories of causes of acute kidney injury
prerenal
renal
postrenal
description of prerenal AKI
aetiologies (4)
hypoperfusion to kidneys
drugs - ACE inhibitor, NSAIDs
sepsis
renal artery stenosis
diarrhoea/vomiting/haemorrhage
treatment of someone with prerenal AKI
think about it
bloods
fluids
the problem is hypoperfusion!
complication of untreated prerenal AKI
acute tubular necrosis
what is acute tubular necrosis
what is it caused by
death of tubular epithelial cells = renal cause of AKI
bc of hypoperfusion (untreated prerenal AKI)
‘muddy brown casts of epithelial cells’
acute tubular necrosis
treatment of acute tubular necrosis
think about the aetiology
fluids
drugs that can cause renal damage = AKI
gentamicin
PPI eg omeprazole
in old people/alcoholics what is a likely cause of AKI
rhabdomyolysis from collapse
apart from drugs and rhabdomyolysis, what is another major cause of renal AKI
glomerulonephritis
description of post renal AKI
examples (3)
obstruction of urine outflow = back pressure of urine into kidneys = AKI
prostate enlargement
kidney stones
tumours
treatment of post renal AKI (3)
catheter
stent
nephrostomy (surgery)
to relieve obstruction
general presentation of AKI (non specific to aetiology)
oliguria (decreased urine output) <0.5ml/kg/hour
rest of symptoms depends on cause
what is the creatinine and oliguria like in the 3 different stages of AKI
stage 1 - x1-1.9 of normal, oliguria <0.5ml/kg/hour for 6 hours
stage 2 - x2-2.9 of normal, oliguria <0.5ml/kg/hour for 12 hours
stage 3 - x3 of normal, oliguria <0.3ml/kg/hour for 24 hours
in an old lady who fell 2 nights ago and lay on the floor until being found and has been producing low conc brown urine (‘coca cola urine’), what investigation would you do (specific to this case)
what are you trying to confirm
CK
rhabdomyolysis causing renal AKI
if you suspect glomerulonephritis causing renal AKI, what blood tests do you want to do (specific to glomerulonephritis)
ANCA for vasculitis
anti-dsDNA for lupus
anti-GBM for goodpastures
when might you do a biopsy in AKI
think about it
if ?renal cause, eg glomerulonephritis
is AKI an emergency or routine situation
emergency!
high mortality rates
if someone has stage 3 AKI and uraemia, what else will you do apart from fix the cause
dialysis to clear toxins
life threatening complication of AKI
hyperkalaemia!
what ion do you need to monitor in AKI to prevent complications
significant findings of this
K+ (otherwise hyperkalaemia)
K >5.5 (K >6.5 is life threatening)
what may hyperkalaemia present with
test for this
findings of test
arrhythmias
ECG - tall/prominent T waves
hypontraemia and hyperkalaemia
addisonian crisis
treatment of hyperkalaemia (4)
calcium gluconate
insulin dextrose
salbutamol nebulised
dialysis if K>7
what does calcium gluconate do when you give it for hyperkalaemia
protects your myocardium from high K
what does insulin dextrose do when you give it for hyperkalaemia
lowers K
is glomerulonephritis usually chronic or acute
chronic
which type of glomerulonephritis is acute
acute rapidly progressive glomerulonephritis
3 categories of aetiology of glomerulonephritis
idiopathic
drugs
immune
drugs that cause glomerulonephritis (4)
gold
penicillin
heroin
NSAIDs
immune causes of glomerulonephritis(5)
lupus ANCA vasculitis (GPA, MPA) goodpastures diabetes hepB/C
is glomerulonephritis an infection
no