Nephrology Flashcards
Define Hydronephrosis
Unilateral or bilateral edema of the collecting system
Indications for renal biopsy
- Nephrotic syndrome
- Acute nephritic syndrome
- Unexplained acute renal failure
Acute Kidney Injury (AKI)
- Abrupt (within 48 hrs) decline in renal filtration function
- Usually reversible
Acute Renal Failure (ARF) criteria
- Decrease in GFR and UOP (< 0.5 mL/kg/hr for >6 hrs)
2. Increase in urea and Creatinine. (azotemia)
End stage renal disease time criteria
> 3 months
What is the MC AKI?
Prerenal= 55-70%
Define prerenal AKI
Hypoperfusion leading to decrease in renal perfusion
List causes of prerenal AKI
- Decrease in intravascular volume: Hemorrhage, dehydration, nephrotic syndrome
- Change in vascular resistance: Cirrhosis, sepsis, anaphylaxis
- Low CO: CHF, PE, tamponade
What is the BUN/Cr ratio in Prerenal AKI
20:1
What nephrotoxic drugs do you want to avoid?
- NSAIDs
- ACE-1
- Digoxin
What are some of the main causes of intrinsic AKI
- Acute Tubular Necrosis. (ATN)
- Interstitial (AIN)
- Glomerular (GN)
- Vascular
What is the MC cause of intrinsic AKI?
Acute Tubular Necrosis. (ATN)
Define ATN
Tubular damage due to:
- Ischemia: Prolonged hypotension/hypoxemia
- Nephrotoxins:
- Aminoglycosides
- Ampicillin
- Vancomycin
- IV contrast - Sepsis
ATN treatment
- Avoid volume overload
- Avoid Hyperkalemia
- Protein restrict
- +/- diuretics
What do you want to give to renal protect from radiographic contrast?
N-acetylcystine/IVF with bicarb
What do you see in the urine in ATN?
Muddy brown casts
Define interstitial intrinsic AKI
Inflammatory response leading to edema and possible tubular cell damage
What is the MC of interstitial intrinsic AKI
Nephrotoxic drugs
UA findings in interstitial intrinsic AKI
eosinophiluria
interstitial intrinsic AKI treatment
- Steroid
2. +/- dialysis