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10.1152/ajprenal.90230.2008 http://scihub22266oqcxt.onion/10.1152/ajprenal.90230.2008 18550645!ä!18550645 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534       Am+J+Physiol+Renal+Physiol 2008 ; 295 (5): F1259-70 Nephropedia Template TP {{tp|p=18550645|t=2008. Intrarenal oxygenation: unique challenges and the biophysical basis of homeostasis |pdf=|usr=}}{{18550645}} gab.com Text Intrarenal oxygenation: unique challenges and the biophysical basis of homeostasis JO: Am J Physiol Renal Physiol http://www.kidney.de/pget.php?&tw=1&pmid=18550645 #FOAvip The kidney is faced with unique challenges for oxygen regulation, both because its function requires that perfusion greatly exceeds that required to meet metabolic demand and because vascular control in the kidney is dominated by mechanisms that regulate glomerular filtration and tubular reabsorption. Because tubular sodium reabsorption accounts for most oxygen consumption (Vo2) in the kidney, renal Vo2 varies with glomerular filtration rate. This provides an intrinsic mechanism to match changes in oxygen delivery due to changes in renal blood flow (RBF) with changes in oxygen demand. Renal Vo2 is low relative to supply of oxygen, but diffusional arterial-to-venous (AV) oxygen shunting provides a mechanism by which oxygen superfluous to metabolic demand can bypass the renal microcirculation. This mechanism prevents development of tissue hyperoxia and subsequent tissue oxidation that would otherwise result from the mismatch between renal Vo2 and RBF. Recent evidence suggests that RBF-dependent changes in AV oxygen shunting may also help maintain stable tissue oxygen tension when RBF changes within the physiological range. However, AV oxygen shunting also renders the kidney susceptible to hypoxia. Given that tissue hypoxia is a hallmark of both acute renal injury and chronic renal disease, understanding the causes of tissue hypoxia is of great clinical importance. The simplistic paradigm of oxygenation depending only on the balance between local perfusion and Vo2 is inadequate to achieve this goal. To fully understand the control of renal oxygenation, we must consider a triad of factors that regulate intrarenal oxygenation: local perfusion, local Vo2, and AV oxygen shunting. Twit Text FOAVip Intrarenal oxygenation: unique challenges and the biophysical basis of homeostasis ????Am J Physiol Renal Physiol http://www.kidney.de/pget.php?&tw=1&pmid=18550645 #FOAvip Twit Text # Free Paper on # # # # # LINK http://www.kidney.de/pget.php?&tw=1&pmid=18550645 #FOAvip English Wikipedia <ref>{{Cite pmid|18550645}}</ref> Intrarenal oxygenation: unique challenges and the biophysical basis of homeostasis #MMPMID18550645 Evans RG; Gardiner BS; Smith DW; O'Connor PM Am J Physiol Renal Physiol 2008[Nov]; 295 (5): F1259-70 PMID18550645show ga The kidney is faced with unique challenges for oxygen regulation, both because its function requires that perfusion greatly exceeds that required to meet metabolic demand and because vascular control in the kidney is dominated by mechanisms that regulate glomerular filtration and tubular reabsorption. Because tubular sodium reabsorption accounts for most oxygen consumption (Vo2) in the kidney, renal Vo2 varies with glomerular filtration rate. This provides an intrinsic mechanism to match changes in oxygen delivery due to changes in renal blood flow (RBF) with changes in oxygen demand. Renal Vo2 is low relative to supply of oxygen, but diffusional arterial-to-venous (AV) oxygen shunting provides a mechanism by which oxygen superfluous to metabolic demand can bypass the renal microcirculation. This mechanism prevents development of tissue hyperoxia and subsequent tissue oxidation that would otherwise result from the mismatch between renal Vo2 and RBF. Recent evidence suggests that RBF-dependent changes in AV oxygen shunting may also help maintain stable tissue oxygen tension when RBF changes within the physiological range. However, AV oxygen shunting also renders the kidney susceptible to hypoxia. Given that tissue hypoxia is a hallmark of both acute renal injury and chronic renal disease, understanding the causes of tissue hypoxia is of great clinical importance. The simplistic paradigm of oxygenation depending only on the balance between local perfusion and Vo2 is inadequate to achieve this goal. To fully understand the control of renal oxygenation, we must consider a triad of factors that regulate intrarenal oxygenation: local perfusion, local Vo2, and AV oxygen shunting. |Animals[MESH] |Biophysical Phenomena/physiology[MESH] |Homeostasis/*physiology[MESH] |Humans[MESH] |Hypoxia/physiopathology[MESH] |Kidney Diseases/metabolism/*physiopathology[MESH] |Kidney/metabolism/*physiology/physiopathology[MESH] |Models, Biological[MESH] |Oxygen/*metabolism[MESH]Intrarenal oxygenation: unique challenges and the biophysical basis of(epmc).pdf DeepDyve Pubget Overpricing