Quantitative Renal Physiology or Evaluation of Renal Function Flashcards Preview

Nephrology > Quantitative Renal Physiology or Evaluation of Renal Function > Flashcards

Flashcards in Quantitative Renal Physiology or Evaluation of Renal Function Deck (11):
1

What is the equation for mass flow?

Mass Flow = Concentration x Volume Flow

2

What are the routes of flow in the kidney?

Input - renal artery
Output - urine, renal vein, lymphatics

3

What is the equation for filtration rate?

Filtration Rate = GFR x Px

4

What is the equation for excretion rate?

Excretion Rate = UF x Ux

5

What substance is used as a model to measure kidney function?

Inulin (not produced in body, not metabolized, excreted only by kidney)

6

What is the equation for plasma inulin concentration?

P in = Infusion rate / Output rate

7

What is the equation that relates GFR and inulin?

GFR = UF x U in / P in

8

Define clearance.

Volume of plasma that is completely cleared of a substance by the kidneys per unit time.

9

What is the equation for extraction ratio?

Ex Ratio = (Ax - Vx) / Ax
Ax = arterial [ ]
Vx = renal venous [ ]

10

What substance do we use to calculate effective renal plasma flow and what is the equation?

Para aminohippurate
C pah = (UF x U pah) / P pah

11

What happens to GFR and creatine plasma [ ] following a nephrectomy?

Sudden drop in GFR that returns to original value
Increase in plasma creatinine concentration