snímek PPT
2. Renal perfusion and filtration
Autoregulation of the kidneys
Autoregulation of perfusion of an organ means keeping its perfusion constant in spite of fluctuations of the systemic blood pressure
As with all organs, Ohm´s formula is valid also for a perfusion (renal blood flow) of the kidneys. Specifically:
RBF = -------, where ?P = Pa - Pe a R = Ra + Re
R must be variable, however, as both renal perfusion and GFR are constant in a broad range of systemic pressures (90-190 mm Hg mean arterial pressure or 11-25 kPa) (Fig. 17). Further term: renal plasma flow