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Causes of Acute Kidney Injury - Differential Diagnosis Framework 
Pre-Renal
Post-Renal
Intrinsic Renal:
 • Tubules (ATN)
 • Glomerular:
- Differential Diagnosis ... : • Tubules (ATN ... Interstitium (AIN ... #Differential #Diagnosis
Acute Kidney Injury (AKI) - Common Patterns on Urinalysis
 - Prerenal
 - ATN
 - AIN
 -
- Prerenal - ATN ... - AIN - UTI ... AKI #Urinalysis #diagnosis
Guide to Acute Kidney Injury (AKI)

What to ask/look for: 
 - HPI, PMH, full ROS
Liano 1996) - ATN ... CKD— 13% (mostly ATN ... AKI #Nephrology #Diagnosis
Fractional Excretion of Sodium - FENa
Fractional Excretion of Sodium (FENa) = (Urine Na+ x Serum Cr)
> 2% suggests ATN ... #calculation #diagnosis
Intrinsic Renal Disease - Differential Diagnosis
Vascular:
 • Macrovascular: Renal artery occlusion, Fibromuscular disease
 • Microvascular: TTP/HUS,
- Differential Diagnosis ... Athero-embolic, HTN ... Ischemia-induced: ATN ... #differential #diagnosis
Acute Kidney Injury (AKI) - Differential Diagnosis Framework
Pre-Renal:
 • Hypovolemia, Cardiorenal, Distributive Shock, HRS, Hypercalcemia, Renal
- Differential Diagnosis ... C3/C4, Other • ATN ... Pigment, Protein) • AIN ... #Differential #Diagnosis
Hypomagnesemia - Differential Diagnosis
Renal Causes of Hypomagnesemia - Familial:
Bartter syndrome and Gitelman syndrome, Isolated recessive hypomagnesemia,
- Differential Diagnosis ... Diuretic phase of ATN ... #differential #diagnosis
Urine Specific Gravity - Interpretation
Specific Gravity = Density of urine / Density of water
SG close to
resistance to ADH) • ATN ... SG fixed at ~1.010 ... Interpretation #diagnosis
Core IM: Pearls on Contrast-Induced Nephropathy

Definition: 
 • no slam dunk criteria 
 • definition in
tubular necrosis Diagnosis ... look for signs of ATN ... sensitivity —100%) #Diagnosis
Medications causing Acute Kidney Injury (AKI)
Prerenal:
 • Dehydration: Diuretics
 • Altered intrarenal autoregulation: ACEIs / ARBs,
Intrarenal: • ATN ... , tenofovir • AIN ... #differential #diagnosis