AKI 

significant reduction in renal function over hours/ days 

and sustained increase in urea creatinine 

80% pre-renal 

KDIGO classifications 

urine output less than 0.5ml/kg/ hour for 6 days ( can be non oliguric AKI - so not always accurate ) 

increase in serum creatinine X more than 1.5 above baseline for 7 days 

serum creatinine increase by 0.3mg/dl in 2 days 

Causes 

Pre-renal - shock / neurovascular compromise 

Renal - ATN / AIN / drug causes ( NSAIS, aminoglycoside, 

Post renal - obstructions ( ureter, bladder, prostate, urethra, external mass ( ovarian, retroperitoneal mass )