Clin Med Exam 3 Flashcards
Most common intrinsic cause
Acute Tubular Necrosis
Causes of Prerenal (decreased perfusion)
True volume depletion Hypotension Edematous state Selective renal ischemia Drugs (NSAIDs, ACE-I)
Intrinsic causes
Renal ischemia
Sepsis
Nephrotoxins
Acute Tubular Necrosis d/t IV Contrast
Contrast causes tubular epith cell toxicity and Renal medulary ischemia frm vasoconstriction
Risk factors:
Pre-existing renal dz
Volume depletion
Repeated dose of contrast
Reduction in GFR will only occur if:
there is a Bilateral obstruction or an issue LOW
Obstruction most commonly d/t
Prostatic dz (hyperplasia or CA)
or Mets
or Neurogenic bladder
Normal urine output
1-2 L /day
Oliguric (little urine)
<400 mL in 1 day
Anuric
<50- 100 mL in 2 day
Muddy brown casts
Acute Tubular Necrosis
FENa
How is kidney handling sodium? (Na)
% of filtered Na that is actually excreted in urine
FENa <1%
Pre-Renal
FENa >2%
Intra-renal (Acute tubule necrosis)
FENa is NOT useful for:
Pts on diuretics
pts in AKI (bc serum Cr is not stable)
When to perform Renal biopsy
No other explanation
Cr markedly elevated or significantly worsening quickly
Purpose: to prevent ESRD
Contra to Renal biopsy
Bleeding issues Severe HTN Pyelonephritis Renal tumor Solitary native kidney
Life threatening complications of Acute Kidney Injury
Volume imbalance Metabolic Acidosis Hyperkalemia, Hyperphosph Uremia HypOOOcalcemia
Severe AKI can cause
Altered mental status
First step to managing AKI
Correct volume status (this can improve or reverse AKI)
Fluid challenge
identify Pre-renal failure
Crystalloid isotonic IVF
Pt doesn’t respond to Fluid challenge
Likely Acute Tubular Necrosis or other forms of Intrinsic or Post renal
If pt is still producing urine,
give diuretic
BUT should not be used for prolonged tx
Metabolic acidosis happens in AKY why?
Not excreting the acid Not making bicarb Low GFR Many causes of AKI produce inc acids Diarrhea net loss of bicarb
Tx of Metabolic Acidosis
Dialysis or
Bicarb administration
Dialyze pts with Metabolic Acidosis IF
Not producing urine (or V little)
Volume overloaded
pH <7.1
Bicarb can make what worse?
Volume overload
When to give bicarb for Metabolic Acidosis?
Pt is not volume overloaded no other indication for acute dialysis ESP IF: diarrhea is cause ph <7.1 and awaiting dialysis
Low Calcium
Chvostek sign (face)
Trousseaus sign (arm)
Paresthesias
Tetany
NEED IV Calcium (but don’t replace too quickly)
If pt has no sx and Calcium is low,
correct the High phosphate with: Phosphate binders
Uremia
urine in the blood
Uremia can lead to
Pericarditis
Neuropathy
Decline in mental status
Uremia is more common in
CHRONIC kidney dz
Leading cause of kidney failure
DM and HTN
Those with CKD and DM are at much higher risk of also developing
Cardiovascular dz
CHRONIC Kidney Dz
3 OR MORE MONTHS OF:
Decreased kidney fx (GFR <60)
OR
Kidney Damage (Albuminuria ACR 30 or more, abnormal imaging, abnormal urinary sediment, hx transplant)
RBC casts
GLOMERULOnephritis
Pts “at risk” for developing CKD should be screened by:
Urine ACR
Serum Cr to estimate GFR (eGFR)
Uremic syndrome
accumulation of metabolic Waste products or Uremic toxins
Uremic syndrome
seen w profound decrease in GFR
Uremic syndrome
Fatigue, anorexia, n/v, pruritus, bruising, METALLIC tase in mouth, SOB, DOE, Pericarditis, restless leg syndrome, seizure, encephalopathy
Secondary hyperparathyroidism
Hyper-phosphatemia, hypocalcemia, decrease in vitamin D
Secondary hyperparathyroidism
PTH
High phosphorus
Low Ca2+
In an effort to raise Ca levels, we stimulate PTH
Meds that lower GFR
ACE-I
NSAIDs
ACE-I and ARBs
dilate Efferent arteriole, decreasing glomerular pressure
When ACE-I and ARBs can be harmful:
Bilateral Renal Artery Stenosis
caution in Acute Kidney Injury (may see acute reduction in GFR and hyperkalemia)
When to refer to nephrologist
GFR <30
Chronic intertubulo dz of kidney
Obstructive uropathy
Reflux uropathy
Analgesic uropathy
Chronic tubulointerstitial
spares the glomeruli
Chronic tubulointerstitial dz General findings
Polyuria
Hyperkalemia
UA nonspecific- proteinuria (<2), broad waxy casts
Obstructive sx
PAIN, change in UOP, HTN, hematuria, inc serum Cr
Obstructive pathology UA
Hematuria, pyuria, bacteriuria but often bland
Obstructive pathology US
Detect mass, hydroureter, hydronephrosis
Reflux Nephropathy
the result of Vesicoureteral Reflux (VUR)
VUR
urine can extravasate into the interstitium–> inflammatory response–> scarring/fibrosis of kidney
Reflux Nephropathy
typically in young children w hx of recurrent UTI
Analgesic Nephropathy
long term consumption of Analgesics (often seen in those w chronic back pain)
Analgesic Nephropathy labs
Often no sx
Labs show elevated serum Cr
UA: hematuria, sterile pyruia, mild proteinuria
Anemia
Analgesic Nephropathy
CT Scan:
Renal papillary necrosis/calcification
Nephrotic syndrome
Non-inflamm
Proteinuria: >3.5
“foamy” oval fat bodies
More edema than in the other
Proteinuria >3.5g/day
Nephrotic syndrome
Nephrotic synd: primary dz (3 subtypes)
Minimal change dz
Membranous nephropathy
Focal segmental glomerulosclerosis
Nephrotic synd: secondary dz
Diabetic nephropathy
Amyloidosis
Oval fat bodies
Lipiduria
Nephrotic synd
Minimal change dz (MCD)
Most common nephrotic synd in KIDS
Most idiopathic, but can be secondary following URI or Allergic rxn
1st line tx for Minimal change dz (primary nephrotic synd)
Prednisone
MCD Minimal change dz primarily affects
Podocyte
podocyte foot process fusion
Membranous nephropathy
adults
peak in 40s, 50s
Primarily idiopathic, thought to be immune mediated
Membranous nephropathy sx
Typical of Nephrotic synd
RISK OF CLOT
Tx for Membranous nephropathy
Supportive, immunosupp, transplant
Adverse risk factors for Membranous nephropath
Male sex, older age >50YO
FSGS
specific pattern under microscope given this name
FSGS
> 70% present with typical Nephrotic synd sx
FSGS greater risk
African American
3-4x more common men
FSGS
Damage to podocyte,
Sclerosis
FSGS tx
Supportive, Immunosupp, Dz specific tx for if secondary dz
Poor outcome for FSGS IF
Nephrotic range proteinuria
African american
Renal insuff
What to order if you suspect Minimal change nephropathy
UA
Serology
Diabetic Nephropathy (secondary dz)
Most common cause of ESRD in US
Diabetic nephropathy
usually in pts who have had DM for 10-20 yrs BUT may be present at time of dz in those with DM Type II
Diabetic nephropathy
Morphologic changes in kidney
inc proteins in urine
Albuminuria >300
Tx of Diabetic nephropathy
Strict glycemic control BP control ACE-I, ARBs Statin therapy Dialysis/ transplant
Renal Amyloidosis
abn shaped protein that CLUMP together, can deposit in gomerulus
Renal Amyloidosis screening
SPEP and UPEP
Renal Amyloidosis tx
Refer to nephro
Tx underlying cause
SPEP and UPEP
Multiple Myeloma
C-ANCA and P-ANCA
GPA
Microalbuminurie
Early sign:
Diabetic nephropathy
Kidney damage
Test of choice to RULE OUT obstruction
Renal US
Test of choice to DIAGNOSE Kidney stone/Nephrolithiasis
CT non contrast
Gold standard test to DIAGNOSE Renal Vein Thrombosis (clot)
MRI
Renal biopsy can aid in the dx of:
Unexplained AKI Nephrotic synd Acute Nephritic synd Mass Assess for rejection after transplant
Cystourethrogram
Contrast injected, X Rays taken while pt is voiding “real time”
Test for VUR,
Bladder distortion
Fistula
Perforation
Cystoscopy (camera into bladder) used to diagnose
Interstitial Cystitis “painful bladder synd”
Bladder tumor, tone, or scarring
Nephritic syndrome
left side
Hematuria
Glomerulonephritis
Rapidly prog GN (RPGN)
Nephrotic syndrome
right side
Asymptomatic proteinuria Nephrotic synd (edema)
Glomerulonephritis
is INFLAMMATORY
usually deposits of immune complexes
Glomerulonephritis
Coca colored, smoky RBC casts protein <3 Elevated Cr, dec GFR Oliguria (little UOP) HTN
RPGN
more severe GN
CRESCENT formation
CRESCENT
RPGN
IgA Nephropathy
“Berger”
Most common cause of primary GN in the world
Think everybody loves Bergers
IgA Nephropathy
Young Asains and Whites
20s-30s
1-2 DAYS AFTER URI
IgA Nephropathy is assoc with
Celiac
Liver cirrhosis
HIV
EBV
Tx for IgA if pt has persistent proteinuria >1
elevated Cr
reduced GFR or
HTN
ACE-I/ ARB
Post Strep GN
1-3 WEEKS after infection
Labs: Low C3 complement, ASO titer, + strep culture
Tx for Post Strep GN
Supportive
should feel better in 2 weeks
IgA Vasculitis/HSP
Tetrad: Artralgias Palpable purpura Abdominal pain Renal dz*
IgA Vasculitis/HSP
This is an immune mediated SYSTEMIC vasculitis
unique bc it has all the other system sx
IgA Vasculitis/HSP
Adults are at increased risk of PROGRESSIVE Renal dz
Tx: supportive
Anti GBM/Goodpasture
“Syndrome”: GN and pulm
“Disease”: GN, pulm dz, AND anti-GBM antibodies
Anti GBM/Goodpasture
Peak for males: 30s
Peak for females: 50-70s
Anti GBM/Goodpasture sx
classic RPGN (rapidly progressive GN, with CRESCENT)
may need dialysis
Anti GBM/Goodpasture pulm sx
Alevoolar hemmorhage, Hemoptysis, SOB
Tx: Plasmapharesis and Immunosupp (PRednisone and Cycloph)
Tx for Anti-GBM/Goodpasture
Dialysis
Plasmapharesis
Immunosupp (Prednisone and Cyclosporine)
Tx for IgA Nephropathy
ACE-I/ARB w the criteria
Tx for Post Strep and IgA Vasculitis/HSP
Supportive
Tx for Anti-GBM/Goodpasture
Plasmapharesis Immunosupp (Prednisone and Cycloph)
SLE Nephritis
LUPUS Anti-ds DNA antibodies Non whites Elevated Cr Confirm w biopsy
Pauci Immune (3 subcategories)
GPA: Granulomatosis w Polyangitis
MPA: Microscopic Polyangitis
EGPA: Eisinophillic Granulomatosis w Polyangitis
Pauci Immune
all end in “PA” for Polyangitis
ANCA-associated
C-ANCA
GPA: Granulomatosis w Polyangitis
Upper AND Lower
Necrotizing granulomos
“Saddle nose”, cough, SOB, nodules/infiltrate/cavitations on CXR
All of ANCA associated are
Classically RPGN (rapidly progressing)
Unique characteristic of MPA: Microscopic Polyangitis
SPARES upper resp tract
No granuloma
P-ANCA associated
MPA: spares upper, no granulomas
EGPA: asthma and eisonophils
Tx for all 3 types of ANCA associated (very necessary! Poor prognosis w/o Tx)
GPA
MPA
EGPA
Immunosupp
- Corticosteroid
- Cytoxic agents
EGPA: Eisinophilic Granulomatosis w Polyangitis
“Churg Strauss”
Asthma and Eisinophils 3 phases: 1. Atopic, Allergic rhinitis, Asthma 2. Eisinophilic infiltrate 3. Vasculitis
Tx for Polycystic Kidney Dz
Strict BP control, low salt
TOLVAPTAN
Dialysis, Transplant, Analgesics
Gene for A. Dominant PKD
PKD1 or PKD2
Sx of PKD
HTN, pain, HEMATURIA, Hx of UTI and stones
Other complications of PKD
INTRAcranial aneurysm
Hepatic cysts
Valvular heart dz
Tx for PKD
TOLVAPTAN
Autosomal Recessive form of PKD
PKHD1 gene
Kidneys AND Hepatobiliary system
K and H
Autosomal Recessive form of PKD
Kids and infants
Autosomal Recessive PKF
PKHD1 gene
Kidneys and Liver-biliary
Enlarged kidneys AND Liver fibrosis
Severe cases of A. Recessive PKD
Neonates have ERD Respiratory distress Big kidneys HTN Portal HTN (liver) Feeding diff and FTT
When can you see Autosomal PKF on Ultrasound?
after 24 weeks gestation
Tx of PKD
Supportive with multi-disc
Definitive Diagnosis of Autosomal Recessive PKF (infants and kids)
Genetic testing
Early screening: Ultrasound
ACUTE Kidney Injury results in
Retention of urea and nitrogenous waste
Dysregulation of volume and electrolytes
Criteria for ACUTE kidney injury based on
Serum Cr OR
Urine output
Sometimes Cr isn’t a good measure of GFR because
Cr hasnt had time to build up
Cr was removed by dialysis
What is most often used for diagnosing ACUTE kidney injury?
KDIGO
Dx ACUTE kidney injury
Inc in Serum Cr 0.3 or more within 48 hours
Inc in Serum Cr 1.5x baseline
Urine volume <0.5 for 6 hours
Huge risk for developing AKI
Hospitalized pts
60% of ICU pts develop AKI
AKI in hospital is most often d/t
Pre-Renal or
Acute Tubular dz (Intrinsic)
Most common etiology of ACUTE kidney injury
Acute Tubular Necrosis (Intrinsic)
Rate of occurence
- ATN (Intrinsic)
- Pre-Renal (perfusion)
- Obstruction least common
Causes of Pre-Renal (perfusion)
Volume depletion (n/v/d/burn) Hypotension Edema Renal ischemia (also in intrinsic) Drugs (NSAIDs, ACE-I)
Intrinsic causes
Renal ischemia (in pre-renal also)
Sepsis
Nephrotoxins
Risk factors of developing Acute Tubular Necrosis (ATN- Intrinsic cause)
Pre-existing Renal dz
Volume depletion
Repeated dose
Most common causes of Post-renal obstruction
Prostate dz
Cancer
Neuro dz
How can UA be helpful in diagnosing Acute Kidney Injury?
Cr
GFR
FENa (how is kidney excreting sodium)
Signs of ACUTE kidney injury
Muddy brown casts
*pathognomic for ATN
Normal Creatine for M and F
M 0.6-1.2
F 0.5-1.1
FENa is <1
Pre-Renal etiology
FENa is helpful in distinguishing
Pre-Renal AKI from ATN (Intrinsic)
Biggest reason to perform Renal imaging
Assess for Obstruction
Danger with obstruction, Predispose for
UTI –> Urosepsis –> Kidney failure
When to do Renal biopsy?
If Cr is MARKEDLY ELEVATED or
SIG WORSENS in couple days
Importance of getting a Biopsy when indicated
More definitive tissue dx
Therapeutic intervention
Prevent ESRD*
Contra to getting Renal Biopsy
Bleeding diathesis Severe HTN Pyelonephritis Renal tumor One kidney
1st Step when dealing with ACUTE Kidney injury?
Volume challenge to see if it can be corrected
If pt meets these things, do a fluid challenge:
Clinical hx of volume depletion (vomiting/diarrhea)
Physical showing Hypovolemia (hypotension/tachy), and/or
Oliguria (little urine)
How much fluid to give for a fluid challenge?
1-3 L to start
If they DONT RESPOND issue is probably ATN or other Intrinsic
What 2 things are we looking for in Fluid Challenge?
Increase Urine output
Increased Kidney function (Cr or GFR)
If a pt is volume overload but still peeing, can give DIURETICS but
not a long term solution
What is the MOST EFFICIENT method of volume removal?
Dialysis
Diuretics are
Temporizing measure
Recap:
Tx of Volume overload
Diuretics (temporary)
Dialysis
Tx of Metabolic Acidosis
Dialysis
Bicarb administration
How to treat Metabolic Acidosis is pt is VOLUME OVERLOADED?
Dialysis
Bicarb can make volume overload WORSE
When to use Dialysis to treat Metabolic Acidosis?
(it is pretty much preferred)
Not producing urine
Volume overloaded
pH <7.1
When to give bicarb to treat Metabolic acidosis?
Volume status is normal (not overloaded)
Acidosis d/t DIARRHEA
ph <7.1 and waiting for dialysis
Hyperkalemia as a result of AKI
Very few sx UNTIL YOU DIE
“it’s: A F A C T”
Hyperkalemia as a result of AKI, Sx can include:
Impaired neuromuscular transmission
Cardiac abnormalities
Arrhythmia Flaccid paralysis Asc musc weakness Conduction abnormality T waves
Tx for Hyperkalemia
Insulin to drive K into cells
Remove extra K with Dialysis
Hypocalcemia sx
Paresthesia
Chvostek
QT prolongation
Hypocalcemia tx if pt is symptomatic
IV calcium
Hypocalcemia tx if pt is asymtpomatic
if High Phosphorus levels are present also, 1st step is to correct Phosphorus!
Hypocalcemia, no symptoms, and Phosphate is >5.5
Tx with Dietary phosphate binders
Low ca, no symptoms, HIGH phosphate, what do we treat with?
Serum ionized Ca low: Ca Acetate or Ca Carbonate
Serum ionized Ca high: Aluminum hydroxide, Lanthanum Carbonate
Serum ionized Ca low
Calcium Acetate or
Calcium Carbonate
Serum ioinized Ca is high
(Wierd names)
Aluminum hydroxide
Lanthanum carbonate
Dialysis should be given to peeps with SEVERE UREMIA “urine in the blood”
Pericarditis
Neuropathy
Unexplained AMS
Females usually get
Pyelonephritis (kidney) or
Cystitis (bladder)
Only upper tract one
Pyelo
UTI Risk factors (3)
Reduced urine flow
Promotion of colonization (sex, spermicide, recent abx)
Facilitate ascent (catheter, incontinence)
Special populations regarding UTIs
Pregnant
Men
Comorbidities, Immunocomp, Underlying urology conditions
Acute SIMPLE Cystitis
confined to bladder
No s/s suggestive of Upper urinary tract or systemic
Systemic sx suggestive of Acute COMPLICATED UTI
Fever
Chills, fatigue, malaise, Flank pain, CVA tenderness, Pelvic/perineal pain in men
Sx of Acute SIMPLE Cystitis
Dysuria, frequency, urgency
+/- hematuria and suprapubic discomfort
Culture for Acute SIMPLE Cystitis?
Not recommended, unless:
- Atypical presentation/dx uncertain
- Suspect COMPLICATED
- Unresolving sx
- Suspect abx resistance
- Special pops
Culture results (if you ordered one) of Acute SIMPLE cystitis
> 10^3 CFU = DIAGNOSTIC
Culture results (if you got one) of Acute SIMPLE cystitis
> 10^2 in combination with Typical sx= POSITIVE culture
Tx of Acute SIMPLE Cystitis
Abx:
Nitrofurantoin (Macrobid)
Bactrim
Fosfomycin
Tx of Acute SIMPLE Cystitis in PREGNANT
Fosfomycin or Augmentin
Do NOT give to pregnant for Acute SIMPLE Cystitis
Fluoroquinolones
Tx for Acute SIMPLE Cystitis
Nitro (5 days)
Bactrim (3 days)
Fosfo (single dose)
Is f/u culture needed with Acute SIMPLE cystitis?
NOT IF SX RESOLVE, unless:
You are pregnant
Acute Pyelonephritis
Systemic sx
Involving kidney parenchyma and Renal pelvis
Flank pain, fever, malaiaise
MORE labs for Pyelo suspicion
Always UA with C and S
Results indicating Pyelo
WBC casts
CFU > 10^5
Do you order CBC and BMP for Acute Pyelo?
Not unless pt is hospitalized
Imaging for Acute Pyelo? Not unless:
Severely ill
Sx persist even after 48-72 hrs of Abx
Suspect Obstruction
Recurrent sx w/in few wks of tx completion
What imaging to order with Acute Pyelo?
CT A/P with AND without contrast
Tx for Mild-Moderate Acute Pyelo
Fluoroquinolones
(Cipro or Levo) 5-7d
Other considerations for Acute Pyelo tx
If pathogen is susceptible to Bactrim, can do that instead
If E.Coli resistance >10%, then give initial does of Rocephin before discharging pt
F/u for Acute Pyelo
WITHIN 48-72 HOURS
Need f/u culture for Acute Pyelo?
Not unless you are pregnant
When is Acute Pyelo considered Severe? –> Hospitalization
Critically ill, Hemodynamically unstable, Pers high fever, Bad pain, Obstruction, Renal dysfx, Unable to eat/drink, Worried about compliance
Tx of Acute Pyelo for Severe/Inpatient
IV Abx
- Fluoroquinolones
- ER Cephalosporin
- ER PCN
- Carbapenem
- Aminoglycoside
+supportive
Primary tx for Acute Pyelo
Nitro
Bactrim
Fosfo
Acute pyelo things you HAVE TO ORDER
UA, C and S
Acute Pyelo labs
WBC Casts
CFU >10^5
Acute Pyelo tx for outpatient
Fluoroquinolones
IC/Painful bladder synd
Abscence of infection
>6 weeks
Associations with IC/Painful bladder synd
IBS
Fibromyalgia
>40 YO
Crazy pathophys of IC/Painful bladder syndrome
Glycosaminoglycan layer Urothelial inj Pro-inflammaotry Mast cell Fibrosis Neural hypersens Neuropathic pain Voiding dysfx
Presentation of IC/Painful bladder synd highly VARIABLE
In men, usually:
Pelvic pain with Sexual dysfx
What you may see on Cytoscopy (camera) with IC/Painful bladder syndrome
Altered urothelium
- Glomerulations
- Hunner lesions
1st line tx for IC/Painful bladder syndrome
Behavior/lifestyle
Pyridium OTC
2nd line tx for IC/Painful bladder syndrome
Oral: TCA(Amitriptyline), Pentosan Polysulfate(Elmiron), Antihistamine(Hydroxyzine)
Other: Lidocaine, PT
Tx for Overactive blader
1st line: Behavioral
2nd line: Antimuscarinics (Oxybutynin, Tolterodine, Solifenacin), Beta-agonist (Mirabegron)