Lack of nonexcretory renal influences on hemodynamics and fluid volume distribution after the volume loading of conscious dogs.

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Abstract
The nonexcretory influences of the kidney on hemodynamics and fluid volume distribution were studied in 6 conscious dogs post-splenectomy. The dogs with intact kidneys were volume loaded with 100 ml/kg of lactated Ringer''s solution in 1 h; the left kidney was removed 2 days later. The volume infusion was repeated 12 days later, within 1 day after the sole remaining kidney was removed. Arterial pressure was elevated to hypertensive levels immediately after the infusion in the intact and anephric groups, but pressure in the intact group returned to control within 5 h after infusion. Fluid volume expansion was evidenced by a sustained increase in blood volume and Na space in the anephric group. Blood volume and Na space of the intact group increased after the infusion but then decreased toward control. Total circulating protein mass increased only in the anephric group and reached a value of 107.5 .+-. 1.3% of control by 24 h after infusion. Central venous pressure was elevated in both groups throughout the entire 25 h period of measurements subsequent to infusion, with the greater elevations occurring in the anephric group. The regression lines relating blood volume to central venous pressure, and blood volume to mean arterial pressure, were not significantly different for the anephric and intact groups. The ratio of blood volume to Na space was not significantly different for the 2 groups during the control and postinfusion periods. The increase in central venous pressure and mean arterial pressure after volume loading appears to be related to the increase in blood volume and not to a change in vascular compliance. Removal of the kidney may not influence hemodynamics or fluid volume distribution.