Blood Flow Through the Collateral Circulation of the Kidney

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Abstract
The collateral circulation of the kidney was developed by progressive stenosis of the renal artery in 13 dogs. Renal blood flow was measured before the experiment, after the stenosing of the artery and after severing the renal artery, and the development of the collateral circulation. The contralateral kidney was removed. Dogs which survived 1-6 mo., only on the collateral blood flow of 1 kidney, were found to have a renal blood flow of 16-38% of the original. In the other cases the final blood flow amounted to 2-10%. The collateral circulation is best formed when the blood flow is decreased to 44-60%. This training of the collaterals with a long time factor is important in the development of the collateral circulation, but it is probably not the only factor. The morphological basis of the collateral circulation, i. e. the number of perforating arteries (the blood supply to the capsule of the kidney), also plays an important role. In addition, the individual reaction of the organism is certainly of importance.