Internal Flashcards
Define prerenal AKI?
Give 8 examples
Any injury leading to decreased renal perfusion
Hypovolemia Hypotension Cardiorenal syndrom Hepatorenal syndrom Abdominal compartment syndrom Acute pancreatitis Drugs Renal artery stenosis
Define intrinsic AKI?
Give 4 examples
Conditions leading to severe and direct renal damage
Acute tubular necrosis
Acute interstitial nephritis
Vascular diseases
GN: RPGN
Define Postrenal AKI
Give 8 examples
Acquired obstruction BPH Iatrogenic (catheter injuries) Tumors Stones Bleeding causing blood cloth Neurogenic bladder Congenital malformations
Causes of ATN?
Ischemia
Nephrotoxic drugs
Endogenous toxins: Hb in hemolysis, Mb in rhabdomyolysis, uric acid in tumor lysis, Bence-Jones protein light chains in MM
Define Hemolytic uremic syndrom? (HUS)
thrombotic microangiopathy occluding the microvasculature
what is hepatorenal syndrom?
Liver cirrhosis - portal HT - increased speelic artery vasodilators (NO) - decreased BP - RAAS activation - renal vasoconstriction - decreased GFR
what is abdominal compartment syndrom?
increased pressure in the abdomen causing compression of vessels
vascular injuries in interstitial AKI (6)
HUS TTP HT crisis vasculitis scleroderma renal vein infarct
define AKI
acute/sudden decrease in renal function withing hours to 7 days (creatinine/urinary output)
Normal creatinine level?
60-99
diagnosis of AKI
- patient history
- Physical examination
- lab test - stage with creatinine
- pre, intrinsic or post
what can you calculate to differentiate Prerenal and intrinsic renal AKI?
FeNa: (Pre <1%) (Intrinsic >2-3%)
FeUrea: (Intrinsic > 50%)
Define CKD
Chronic kidney disease (CKD) is defined as an abnormality of kidney structure or function that persists for > 3 months
most common causes of CKD (5)
- Diabetic nephropathy
- Hypertensive nephropathy
- Glomerulonephritis
- PKD
- NSAIDs
inflammatory GN?
- RPGN
- PSGN
- SLE nephritis
- HUS
Non-inflammatory GN?
MCGN
Membranous nephropathy
FSGN
what happens in our body when CKD?
- decreased urin production - volume retention
- no toxin excretion - uremia
- hyperphosphatemia (when FGF23 subsides)
- amenia due to EPO insufficiency
- HPTH
What can uremia do in the heart?
uremic pericarditis - fibrinous pericarditis
Define end stage kidney disease?
is it reversible?
GFR < 15 mL/min
not reversible
What disease can we frequently see in CKD and have to treat?
Osteodystrophy due to hyperphosphatemia, hypocalcemia and vit D deficiency causing hyperparathyroidism
Indications of dialysis?
Acidosis Electrolyte disorder - hyperkalemia Intoxication Overload of fluids Uremic syndrom (pericarditis)
Nephritic syndrom presentation
proteinuria < 3.5 hematuria - acanthocytes RBC casts in urin might be seen no edema/general little proliferative hypertension due to oliguria
nephrotic syndrom?
proteinuria > 3.5 no hematuria edema hyperlipidemia non-proliferative
why is there a increased risk of thromboembolism in nephrotic syndrom?
loss of antithrombin III
causes of nephrotic syndrom? (6)
- MCD
- FSGS
- membranous nephropathy
- diabetic nephropathy
- amyloid light chain AL amiloidosis
- lupus nephritis
Causes og nephritic syndrom (9)
- PSGN
- RPGN
- Lupus nephropathy
- IgA nephropathy
- granulomatosis with polyangiitis
- microscopic polyangiitis
- good pasture syndrom
- Alport syndrom
- Thin basement membrane
systemic symptoms of RPGN
fever weight loss joint pain weakness palpable purpuras
treatment of minimal change disease
good respons to steroids
treatment of FSGS
long steroid treatment
cyclosporins if steroid resistant
membranous nephropathy treatment
steroid + cyclophosphamides/cyclosporin
treatment of diabetic nephropathy
ACEI/ARBs to control BP and proteinuria
treatment of amyloidosis
hematogenic treatment
labs in PSGN
Anti-streptolysin titer
Low C3/Normal C4
Elevated IgM and IgG/normal IgA
lab parameters in ANCA vasculitis RPGN
elevated anti-MPO
elevated ant-PR3
eosinophilia
normal complement level
lab tests in Good-Pasture RPGN
anti-GBM
rarely ANCA positivity
normal complement
IgG deposits on immunofluorecent in Good-pasture RPGN?
LInear deposition
labs in SLE nephritis
ANA-positivity elevated anti-dsDNA elevated anti-C1q low C3 and C4 potential pancytopenia
immunofluorecent in SLE nephritis
FULL HOUSE
granular Ig G, A, M, C3, C1q
oliguria value?
< 400 ml urine /day
Diagnosis in acute tubulointerstitial diseases, treatment?
Biopsy
treatment depends on cause but corticosteroids in almost every case
caused of acute TIN
drugs
infection
systemic infection
idiopathic
name the tubulointerstitial diseases (4)
- Acute TIN
- MM cast nephropathy
- isolated tubulopathies
- renal tubular acidosis
what is the most common kidney injury in multiple myeloma (MM)
multiple myeloma cast nephropathy
pathophysiology of MM cast nephropathy?
light chains are filtered and excreted in urine
they precipitate in tubules clogging them
obstruction and toxic to tubular cells
forms of isolated tubulopathies
Fanconi and
Gitelman
pathophysiology in Gitelman syndrome?
like the patient is taking continous Thiazides
Na wast - no K+ exchange - hypokalemia - alkalosis
Fanconi syndrom pathophysiology
impaired bicarbonate reabsorption
what other diseases does ARPKD manifest with?
pulmonary insufficiency
progressive liver failure - portal and hepatic fibrosis
what other diseases does ADPKD manifest with?
arterial hypertension
progressive liver disease
curative treatment of PKD
transplantation
mutation in ADPKD
PKD1 ch 16 - polycystein-1
PKD2 ch 4 polycystein-2
mutation in ARPKD
PKHD1 ch 6 - fibrocystin
mechanism of PKD1 and PKD1
PKD1 - cell-cell / cell-matrix interaction
PKD2 nonselective cation channel transporter Ca2+
renal cysts in medulla and cortex compressing vessels activation RAAS
PKHD1 mutation mechanism
defect fibrocystin - cystic dilation of collecting duct and bile ducts (intrahepatic and extrahepatic)
where may the cysts also be in ADPKD
pancreas, liver, ovary and testicle
hepatic benign cysts increases with age
what is important to monitor in ADPKD if family history of stroke?
barrys aneurism - subarachnoid bleeding
what can be seen in children born with ARPKD?
potter syndrom during pregnancy (no embryo urin)
clubbed feet
craniofacial abnormalities
what is the difference between the cysts in AR and ADPKD on US?
both bilateral but AD varying in size and AR same size
whend do you use MRI in PKD?
to screen for berry’s aneurysms if family history
what mediation can slow down a rapid progression of ADPKD
tolvaptan
which medication should not be given in polycystic kidney disease?
ADH - increase cyst growth
risk factors for renal cell carcinoma (7)
smoking acquired cysts nephrolithiasis long term acetaminophen use hepatitis C HT Sickle cell anemia
when does RCC usually become symptomatic?
tumor size > 10 cm and/or if merastasis is present
causes of calcium oxalate stones
hypercalcemia
hyperoxaluria
hypocitraturia
causes of uremic acid stones
hyperuricemia - hyperuricosuria
increased cell turnover (leukemia, chemo)
gout
cause of calcium phosphate stones
hyper parathyroidism
type 1 tubular acidosis
clinical symptoms of urinary tract stones
unilateral colicky pain radiates to the groin progressive worsening hematuria nausea, vomiting, reduced bowel sounds dysuria, frequency, urgency, passing stones unable to sit still
if imaging is needed in nephrolithiasis which?
CT without contrast - hydronephrosis
what imaging is used in follow up after nephrolithiasis treatment?
KUB X-ray (kidney, ureter, bladder)
is x-ray always good in nephrolithiasis?
not for small stones
when do you consult with nephrology in UTI stones?
if size > 10mm
what analgesic is given in nephrolithiasis?
diclofenac
conservative treatment of nephrolithiasis?
- Tamsulosin (alpha blocker) if < 10 mm
2. Nifedipine (CCB)
Interventional treatment of nephrolithiasis?
ureteroscopy (URS) or
extracorporeal shockwave lithotripsy (ESWL)
renal stones larger then 20 mm percutaneous nephrolithotomy
indication of a glomerular hematuria?
light color/normal color urine acanthocytes RBC cast might be seen no cloths proteinuria > 500mg/day
indication of non-glomerular bleeding
dark urine no acanthocytes no RBC casts cloths might be seen proteinuria < 500mg/day mostly albumin
normal protein excretion?
up to 200mg/day
mostly Tomm Horsfall proteins from LOH
normal albumin excretion
< 30mg/day