Ch. 18 Renal/GU Flashcards
Proteinuria + RBC casts +hematuria = ______
Glomerulonephritis
Proteinuria + fatty casts or oval bodies = _____
nephrotic syndrome
proteinuria + WBCs, WBC casts without bacteria = _____
interstitial nephritis
proteinuria + hyaline casts = _____
benign causes
How is nephrotic syndrome diagnosed?
clinical and lab findings:
1. peripheral edema and/or ascites
2. proteinuria: 3+ or 4+ on dipstick, or 3.5g protein per 24 hours
How should nephrotic syndromes be treated?
fluid restriction
IV diuretics
BP control with ACE inhibitors
Corticosteroids may reverse or delay disease progression
What is a complication of nephrotic syndrome?
increased risk of thrombosis – DVTs and renal vein thrombosis
What are some things that can cause pseudohematuria?
- foods: beets, berries, rhubarb
- meds: rifampin, phenazopyridine, nitrofurantoin
- Porphyrias (heme precursors enter urine)
Hematuria + hearing loss… diagnosis?
Alport syndrome
hematuria + recent URI.. what two things should be on your differential?
Glomerulonephritis
IgA nephropathy
hematuria + petechiae/purpura +/- schistocytes on smear
In a child?
In an adult?
in a child, think HUS
in an adult, think TTP
Hematuria in a developing country, what should you consider?
Schistosomiasis
What serum BUN/Cr ratio suggests prerenal source of AKI?
> 20:1
What serum BUN/Cr ratio suggests post-renal source of AKI?
> 20:1
What serum BUN/Cr ratio suggests acute tubular necrosis as cause for AKI?
<20:1
What do you see on urinalysis in prerenal AKI?
normal or hyaline casts
In what type of AKI would you see granular (muddy brown) casts on UA?
acute tubular necrosis
In what type of AKI would you see dysmorphic RBCs, RBC casts, and proteinuria on UA?
intrinsic AKI: renal acute glomerulonephritis
In what type of AKI would you see WBC, WBC casts, eosinophils on UA?
Acute interstitial nephritis
How is FENa calculated?
(urine sodium X plasma Cr) / (plasma sodium X urine Cr) x 100
What types of medicines may contribute to prerenal AKI?
NSAIDs, ACE inhibitors
What are 4 causes of intrinsic AKI?
- GN
- AIN
- ATN
- Vascular disease
What diseases fall under GN?
- poststrep GN
- lupus
- Goodpasture
- systemic vasculitis
How is GN diagnosed?
hematuria, dysmorphic RBCs, proteinuria (may or may not be nephrotic range), and RBC casts
Renal biopsy is definitive
What is the treatment for GN?
supportive care, control BP
steroids/immunosuppressives to treat an underlying disease; but not for poststrep GN
What medications cause AIN?
penicillins, diuretics, anticoagulants, NSAIDs
What are symptoms of AIN?
vary – 35% have fever, 30% arthralgias, 20% rash
How is AIN diagnosed?
elevated BUN/Cr
presence of eosinophils, WBCs, and WBC casts on UA
Renal biopsy is definitive
What is the treatment for AIN?
supportive care
discontinue offending agents
Steroids only if no improvement after 3-7 days – no indication in ED
What is the most common etiology of hospital-acquired AKI?
Acute Tubular Necrosis
What are some nephrotoxic agents that can cause acute tubular necrosis?
aminoglycosides (Gentamycin, tobramicin)
radiocontrast agents
What type of AKI does rhabdo cause?
ATN
How is ATN diagnosed?
loss of urinary concentrating ability.
Urinalysis: Granular (muddy brown) casts and renal tubular casts.
or presence of rhabdo
What is the treatment for ATN?
Treat underlying precipitating cause or discontinue offending age
What conditions may put you at higher risk of ATN?
diabetes
pre-existing renal insufficiency
that will be receiving contrast agents
In those with DM or renal insufficiency, what could you pretreat with to prevent ATN?
N-acetylcysteine
and/or sodium bicarbonate, and IV hydration with normal saline
How is CKD defined?
permanent loss of renal function of > 3 months duration
How is CKD staged?
based on the
estimated glomerular filtration rate (GFR)
How is ESRD defined?
End-stage renal disease (ESRD, or kidney failure) is the final endpoint where GFR is < 10% of normal,
& clinical sx of uremia will ensue without dialysis or transplant
What are symptoms of uremia?
anorexia, nausea, vomiting, and decreased mental function
What do you call the deposition of urea from evaporated sweat; fine white powder on skin?
Uremic frost
What is renal osteodystrophy?
Due to loss of vitamin D3 production and secondary hyperparathyroidism
■ Bone pain, muscle weakness, fractures
What dx should you consider in any ill-appearing patient with ESRD?
Cardiac Tamponade
What do you call the D\deposition in the tunica media of small arteries leading
to thrombosis, ischemia, and necrosis of skin and soft tissues?
calciphylaxis
What type of anemia does ESRD typically cause and why?
Normocytic, normochromic
■ Due to decreased erythropoietin production and RBC survival time
Why are ESRD patients at higher risk of bleeding?
Multifactorial: Decreased platelet function, altered von Willebrand factor (vWF)
What is asterixis?
hand flapping
with dorsiflexion
What is first line treatment for acute bleeding in ESRD patients?
DDAVP: First line, stimulates release of vWF from endothelial cells
What is second line treatment for acute bleeding in ESRD patients?
Cryoprecipitate: Contains factors I (fibrinogen), II (fibronectin), VIII,
XIII, and vWF
What are the indications for dialysis?
A: Severe acid-base disturbance (metabolic acidosis)
E: Severe electrolyte disturbance (hyperkalemia, hypercalcemia)
I: Certain toxic ingestions (eg, lithium, alcohols, barbiturates, salicylates)
O: Volume overload (pulmonary edema, severe HTN)
U: Symptomatic uremia (pericarditis, twitching, nausea/vomiting, encephalopathy)
What do you call cerebral edema due to rapid changes in body fluid composition and osmolality in setting of dialysis?
Dialysis Disequilibrium Syndrome
What is the treatment for Dialysis Disequilibrium Syndrome?
supportive;
no indication for mannitol or hypertonic saline
What is the treatment for suspected infection of vascular access sites?
IV Vanc
+
Gentamycin or 3rd generation cephalosporin
What bacteria is most commonly associated with vascular access infections?
staph
What 2 organisms most commonly cause peritoneal dialysis-related peritonitis?
staph and strep
How is peritoneal dialysis-related peritonitis diagnosed?
PD fluid with > 100 WBC/mm3 with > 50% neutrophils or a positive Gram stain.
(This is a lower cutoff than the 250 neutrophils/mm3 for SBP)
What is Branham sign with regards to fistulas?
The drop in heart rate with occlusion of the dialysis access site
** indicates a high output
heart failure from excess flow
through the AV fistula.
The diagnosis can be confirmed with Doppler ultrasound.
What is the treatment from PD peritonitis?
Intraperitoneal (IP) antibiotics (may give IV if IP not immediately available):
Vancomycin or third-generation cephalosporin
What is the most common site of urolithiasis?
UV junction (ureterovesicular)
With what types of bacteria do you see struvite kidney stones?
Urea-splitting bacteria such as:
- pseudomonas
- klebsiella
- staphylococcus
- proteus