2. Renal Flashcards
(73 cards)
kidney metabolic rate
> 400 kcal/kg tissue/day
HIGH
kidneys CO
20-25%
normal glomeruli will filter
180 L plasma/day
kidney function
regulate water and sodium
volume homeostasis
kidney nephrons
1 million
kidney autoregulation
50-150 mmHg
what triggers afferent arteriole to dilate or constrict
change in Cl-
angiotensin 2 function
incr ADH
efferent constriction
incr Na+ absorption in PT
incr aldosterone
aldoserone function
incr Na+ absorption from DT
best index of kidney function
GFR
normal GFR
> 90 mL/min/1.73 m2
after age 20 GFR decreases
1% annually
uremia symtoms appear once
GFR < 15
easiest marker of kidney function
Cr
Cr is byproduct
muscle/protein breakdown
why is cr useful
not secreted or ecreted
normal Cr (female)
0.6-1 mg/dL
normal Cr (male)
1-1.3 mg/dL
BUN
soft indicator of GFR
can be reabsorbed
what BUN correlates with decr GFR
BUN > 50
FENa
ratio of Na+ in plasma and urine to ratio of Cr in plasma and urine
FENa < 1%
tubule reabsorbing Na appropriately
FENa > 2%
tubule failing to recapture Na
tubule dysfunction
FENa > 3%
acute tubular necrosis