Kety-Schmidt method
??????Any other methods
Amount of N2O taken up by brain per unit time = CBF x a-V difference of N2O across brain
Also used to measure coronary blood flow
[TF8: p186]
Use of PAH to measure effective renal plasma flow (RPF)
Clearance of PAH
= Urine PAH content (per unit time) / Plasma [PAH]
= Effective RPF
Effective renal blood flow
= Effective RPF / (1-Hct)
NB:
Use of hepatic extraction of bromsulphalein or indocyanine green
Dye is removed only in liver, and it has no enterohepatic circulation
Constant infusion till steady state
Blood taken from peripheral veins (which would have the same level as hepatic artery) and from hepatic vein using a catheter
Measurement is using spectrophotometry using peak absorption at 805nm, which is also the isobestic point for haemoglobin
--> Oxygen saturation will not influence result
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Created | 20050603 |
Reviewed | 20050603 |