Nephro : Glomerular Disease / AKI / CKD Flashcards
ANCA disease : nephrotic or nephritic ?
Nephritic disease
ANCA vasculitis, when should you choose rituximab over cyclophosphamide ?
- Premenopausal women, men interested in preserving fertility
- Frail older adults
- Relapsed disease
- If no evidence of RPGN
IF RPGN / Cr > 354 : CYCLOP
ANCA vasculitis, when should you consider PLEX ?
- Anti GBM (double positive / overlap)
- if ANCA + GN vital organ / life threatening, Cr > 500
- Pt at high risk of progression to ESRD (and accept a potential higher risk of infection)
AntiGBM disease : nephrotic or nephritic ?
Nephritic / RPGN
Do you need biopsy in case of IgA nephropathy ?
Rarely need biopsy
Diagnosis is clinical
Does sodium bicarb decrease decline in GFR ?
Yes !
For which nephropathy should you screen for malignancies ?
Membranous
Age-based screen + pretest probability
FSGS nephropathy : nephrotic or nephritic ?
Nephrotic
HBV renal disease : associated with which nephropathy ?
Membranous, MPGN, polyarteritis nodosa (PAN)
** 1-5% of patients with HBV develop PAN
Clinically pre renal AKI
HCV renal disease : how are the labs ?
MPGN +/- cryo
Classically low C4 (but not always) and high RF
HCV renal disease : MPGN +/- cryoglobulinemia : what is the clinical presentation ?
nephritic/proliferative picture, palpable purpura, arthralgias, weakness, peripheral neuropathies
Henoch-Schönlein purpura : what is the presentation ?
SYSTEMIC IgA vasculitis with arthritis, purpura, GI symptoms
Hepato renal syndrome : hematuria or proteinuria ?
Neither or minimal
Tubular function is preserved
High K foods to watch out for ?
Fruits : oranges, tropical fruits
Avocado, tomato, potatoes
beans, green leafy vegetables
nuts/seeds/milks
High PO4 foods to watch out for ?
Dairy : cheese, milk
Protein : shellfish, liver, deli meats
How are the electrolytes in rhabdomyolysis ?
HyperK and hyperPO4
HypoCa
Uricemia
Metabolic acidosis
How can you start metformin to a CKD patient ?
OK if GFR > 30
eGFR 30-44 : initiate at 1/2 dose and titrate upwards to half of max recommended dose
How do you deal with hyperkaliemia for CKD-Db patients on ACE / ARB ?
Accept up to 20% rise of creatinine within 4 weeks
Consider K binder before altering RASi dose + dietary change
How do you diagnose hepatorenal syndrome ?
Discontinue diuretics / antihypertensives and give albumine 1g/kg and you will not see an improvement
How do you diagnose post streptococcal / infectious GN ? What labs?
LOW C3 and N C4
+ ASOT 70%
+ anti DNase B 90%
How do you treat hypocalcemia in CKD ?
Calcium carbonate and calcitriol (1,25 vit D)
Can’t use vitamin D if hyperphosphatemic
How do you treat IgA nephropathy ?
Name 3 points.
- ACEi or ARB if proteinuria > 0.5g/d, titrate to proteinuria < 500mg-1g/d
- Adequate BP control (SBP < 120)
- Consider steroids x 6 months if high risk of progressive CKD (refractory proteinuria >0.75-1g despite tx with RAASi x 90d)
How do you treat nephrotic syndrome ?
- Edema : Na restriction + loop diuretics
- DLP : statins, diet
- Proteinuria : ACEi, BP control (SGLT2 NOT studied)
- Thombosis : consider full dose anticoag w warfarin if certain criterias
Definitive management with immunosuppresion in most 1e cases
How does post streptococcal / infectious GN present ?
Varies from:
- Microscopic hematuria
- Proliferative GN : red/brown urine, proteinuria, edema, HTN, AKI
How is calcemia in rhabdomyolysis ?
Hypocalcemia
How is the complement in cholesterol emboli syndrome ?
Low C3/C4
How is urine sodium in hepatorenal syndrome?
Na U < 10
How long do you give cyclophosphamide in anti GBM therapy ?
2-3 months
How long do you give steroids in anti GBM disease ?
6 months usually
How much proportion of albuminuria is normal ?
Generally, minimum 50% proteinuria is albumin
How should you manage anticoagulants for a kidney biopsy ?
- Warfarin
- IV heparin
- LMWH
- DOAC
STOP ANTIPLATELET 5 DAYS before and resu;e 5 DAYS after biopsy
- Warfarin : allow INR < 1.5, bridge depends on patient
- IV heparin : stop 6h prior and allow aPTT to N, resume 12-24h later
- LMWH : stop the day prior and resume 48-72h later
- DOAC : no data
How should you manage antiplatelets for a kidney biopsy ?
Stop antiplatelets 5 days before and resume 5 days post biopsy
Research shows that no increased bleeding with continuing ASA
Hyaline cast : etiology ?
RBC cast : etiology ?
Granular cast : etiology ?
Tamm Horsfall : etiology ?
Hyaline cast in CKD
RBC cast in GN
Granular cast in ATN
Tamm Horsfall is normal
In case of ANCA vasculitis : treatment of induction ?
- Methylprednisolone up to 1g x 3 days
- Cyclophophamide or rituximab
RPGN and creat > 354 : cyclo preferred
Ritux preferred if men/women wanting preserved fertility, frail older adults, relapsed disease, no RPGN
- Cyclophophamide or rituximab
Is drug related acute interstitial nephritis dose dependent ?
Not a dose dependent effect
Landmark trials :
- Is accelerated renal replacement therapy associated with lower risk of death ?
- Is postponing of RRT associated with benefits ?
- No not associated with lower risk of death at 90 days
- No longer postponing of RRT initiation did not confer additional benefit and was associated with potential harm
Management of GN disorders : what to advise concerning diet ?
Na < 2g
Heart healthy
**Adequate protein if nephrotic range proteinuria (0.8-1g/kg/d)
Membranous nephropathy : nephrotic or nephritic ?
Nephrotic
Minimal change nephropathy : nephrotic or nephritic ?
Nephrotic
MPGN (membro proliferative), what are the complement values ?
LOW C4 and normal C3 (but can be low too)
MPGN : underlying etiology ?
HCV, HIV, cryos
Other infection, complement dysregulation, monoclonal gammapathies
AI disorders, TMS, APLS, sicke cell, polycythemia
Nephritic syndrome : typical etiology if..
- Low C3 ?
- Low C4 ?
- Low C3 and C4 ?
- Normal complement ?
C3 : post streptococcal/infectious GN
C4 : MPGN
C3/C4 : SLE
Normal : IgA
Nephritic syndrome and low C3 / C4 : etiology ?
SLE most common
Nephritic syndrome and LOW C4 : etiology ?
MPGN : membrano proliferative
Multiple etiologies : HCV, HIV, cryo, infections, complement dysreg, AI…..
Nephritis syndrome and LOW C3 : diagnosis ?
Post streptococcal / infectious GN
SLE nephritis : treatment principles for class III/IV ?
- Hydroxychloroquine for all
- Induction with steroids (IV pulse x 3 days then pred)
- ADD CYC or MMF
(Choose MMF if at risk of infertility / fertility consideration or Asian/African/Hispanic ancestry) - ACEi for proteinuria
Maintenance with same agent to induce unless CYC : MMF or ASA
SLE nephritis : treatment principles for class V ?
Hydroxychloroquine for all
ACEi/ARB for proteinuria and good BP control
Statin
If nephrotic range proteinuria : add glucocorticoid + 1 of MMF/ASA/CYC/Ritux/ASA/Cnl
SLE nephritis type V and progressive renal dysfunction : what should you R/O ?
R/O renal vein thrombus with renal US
Consider repeating renal biopsy (possible concurrent class)
Need additional immunosuppresion
TARGETS IN CKD :
- K
- HCO3
- PO4 / Ca
- PTH
- K < 5
- HCO3 > 22
**RCT evidence to slow decline in GFR - PO4 and Ca toward normal range
- PTH target unknown for pre dialysis CKD
PTH target for dialysis patients is 2-9 x ULN
TARGETS IN CKD : Hb ?
Hb 100-110 with tsat > 30 %
What are 3 causes of + blood on dipstick with negative erythrocytes ?
Rhabdomyolysis, hemolysis, mechanical valve
What are 4 causes of ketones on urinalysis dipstick ?
Starvation
DKA
Alcohol
Poisoning
What are common drugs causing acute interstitial nephritis ?
«ANTI»
- inflammatory : NSAIDs, COX 2 i
- biotics : penicillins, cephalo, rifampin, cipro, septra
- gout : allopurinol
- acid : PPI’s
- edema : loop and thiazides
- immunotherapy
What are secondary causes of FSGS ?
Infx : HIV, parvo 19, EBV
Drugs : heroin, pamidronate…
HYPERFILTRATION with obesity, single kidney, reflux nephropathy
What are secondary causes of membranous nephropathy ? Name 5 causes.
SLE
CANCER solid tumors > heme (CLL)
Drugs : NSAIDs, anti TNFs
Sarcoidosis
Infection : HBV, HCV, syphilis, HIV
What are secondary causes of minimal change nephropathy ?
Heme cancer : HODGKINS, leukemia
Drugs : NSAIDs, COX2i
Infections rare like TB
What are the antibodies in EGPA ?
p ANCA / anti MPO in 40 %
What are the antibodies in MPA ?
P ANCA and C ANCA
What are the antibodies positive in GPA ?
C ANCA / anti PR3 in 80 %
What are the CI to a kidney biopsy ?
UTI, uncooperative pt, bleeding diathesis
Uncontrolled HTN, poor visualization
Infection
RELATIVE : solitary kidney, hydronephrosis, small kidneys