My Version of Pathoma Renal Failure Flashcards
hallmark of acute renal failure is
- azotemia
what is azotemia
- increased BUN and creatinine
what often accompanies azotemia in acute renal failure
- oliguria - low urine production
what is prerenal azotemia due to
common cause
- decreased blood flow to the kidneys
- heart failure
what is the GFR in prerenal azotemia
- low GFR
BUN/Creat raio in prerenal azotemia
> 15
tubular function in prerenal azotemia
- remains intact
fractional excretion of Na in prerenal azotemia
< 1%
urine osmolality in prerenal azotemia
> 500
post renal azotemia due to
- obstruction of urinary tract downstream from kidney
GFR in post renal azotemia
- decreased
BUN/Creat in early stage of obstruction of post renal azotemia
why
> 15
- increased tubular pressure forces BUN into the blood
tubular function in early post renal azotemia
- remains intact
FENa in early post renal azotemia
< 1%
urine Osm in early post renal azotemia
> 500
tubular function in long standing obstruction post renal azotemia
- tubular damage ensues
BUN/Creat ratio in long standing obstruction post renal azotemia
why
< 15
- tubular damage results in decreased reabsorption of BUN
FeNa in long standing obstruction post renal azotemia
why
> 2%
- decreased reabsorption of sodium