Effect of dehydration on renal blood flow in dog.

Abstract

The effect of dehydration on intrarenal blood flow was investigated in 11 dogs, using polarographic determination of H2-gas desaturation for measuring local blood flow in inner cortex (ICF) and outer cortex (OCF). Dehydration was induced by 48 h water deprivation +2-300 mg ethacrynic acid (EA) per os the day before the experiment. Compared to a control group (n=9) ICF was markedly reduced to 2.40 +/- 0.47 ml/min X g (control 3.23 +/- 0.64) whereas OCF 3.29 +/- 0.80 ml/min X g was nearly unchanged (control 3.59 +/- 0.85). The ratio OCF/ICF was increased to 1.37 (1.11). Further dehydration by hypertonic peritoneal dialysis for 3 h increased Hct to 60 +/- 4 and further reduced OCF and ICF, without significant change of the OCF/ICF-ratio. At Hct above 55 sudden and intermittent changes in local cortical blood flow were recorded randomly at individual electrode sites, showing ischemic periods lasting for 1 to 60 min. Such flow changes were observed in 13 of 14 expts. and were not accompanied by changes in RBF. It is concluded that moderate dehydration causes a greater reduction of ICF than of OCF. Severe dehydration gives in addition rise to patchy, intermittent ischemia in both cortical layers.

• Authors: A Kirkebo, I Tyssebotn
• Journal: Acta physiologica Scandinavica (Acta Physiol Scand) Vol. 101 Issue 3 Pg. 257-63 (Nov 1977) ISSN: 0001-6772 [Print] England
• PMID: 596201 (Publication Type: Journal Article)

Chemical References

• Ethacrynic Acid

Topics

• Animals
• Dehydration (complications, etiology, physiopathology)
• Dogs
• Ethacrynic Acid
• Ischemia (etiology)
• Kidney Cortex (blood supply)
• Peritoneal Dialysis
• Regional Blood Flow