Abstract
Effects of renal venous pressure (RVP) elevation on the renal hemodynamics, urine formation and renin secretion rate (RSR) were studied in the pentobar-bital anesthetized dogs. Gradual increment of RVP produced no changes in RBF and GFR till 30 mmHg but a significant decrease in them at RVP above 35 mmHg. The urine flow response to RVP elevation was divided into two groups: an increased urine flow with an increase of sodium excretion and a decreased urine flow with a decrease of sodium excretion. In the former group, gradual RVP elevation produced a significant increase in UNaV, Na/K ratio and TCH20 without changes in UKV and Cosm, while the latter group showed a decrease in UNaV, UKV and TCH20. Renin secretion rate (RSR), the product of RPF and renal venous-arterial difference of plasma renin activity, increased significantly as function of RVP elevation. This RSR increment seemed to be independent of changes in RBF, GFR, urine flow, or UNaV and the increased mechanism of RSR was discussed. It is concluded that tubular handling of sodium is not essential but intrarenal baroreceptor mechanism seems to be responsible for renin release in case of RVP elevation.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
