HYPERTENSION INDUCED BY HIGH-SALT INTAKE IN ABSENCE OF VOLUME RETENTION IN REDUCED RENAL MASS RATS

Reduction of renal mass (RRM) combined with a high-salt diet results i n volume retention, a rise of cardiac output, and hypertension. The pr esent studies were designed to determine whether prevention of volume retention would alter the rise of mean arterial pressure (MAP) in RRM rats given high salt. Rats were studied in a modified metabolic cage t o permit continuous determination of total body weight (TBW). In group 1, NaCl was increased from 1 to 14.5 meq/day and delivered isotonical ly. In group 2, NaCl was increased while TBW was servo-controlled to a constant level. Group 3 was also servo-controlled, but rats received an intravenous infusion of an arginine vasopressin V-1 antagonist thro ughout the study. MAP in group 1 rose 24 mmHg by day 4 of high salt wi th a parallel increase of TBW of 26 g. In group 2, MAP rose 48 mmHg by day 4 of high salt, while TBW was controlled to within 0.6% of contro l body weight. With inhibition of vasopressin V-1 receptors (group 3), MAP rose 39 mmHg. Nearly equivalent amounts of NaCl were retained in all groups, which was associated with no change of plasma Na in group 1 but an increase of nearly 7 meq/ml in groups 2 and 3. Hematocrit fel l nearly 9% in groups 2 and 3 compared with a 4% reduction in group 1. The results suggest that under conditions where net retention cannot occur, high salt intake increases MAP by an osmotically driven fluid t ransfer from cells, which results in an even greater expansion of bloo d volume. The results indicate that in situations where renal excretor y function is severely compromised, as in end-stage renal disease, a h igh salt intake and associated hypernatremia can result in sustained h ypertension in the absence of a net retention of fluid.