The results of synchronous monitoring of blood impedance versus body impedance in dog experiments showed that the speed of physiological hemodilution related to blood loss up to 30 ml/kg is poorly dependent on the rate of blood loss (0.4-1.0 ml/kg/min) and averages 0.186 +/- 0.02 ml/min/kg. Termination of blood loss is followed by marked reduction in the rate of auto-hemodilution. In bloodletting the studies revealed a linear dependence between the volume of blood loss up to 30 ml/kg and tissue fluid volume entering the blood stream. In blood loss intestinal absorption of fluid does not block the fluid introduction from the interstice. When associated, both these flows increase volume of fluid filling vascular bed and promote stable recovery of the baseline circulating blood volume.
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