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Balances of sodium, potassium, and water were studied in the growing male pig as hypertension developed in response to subcutaneous implantation of deoxycorticosterone acetate (DOCA). Serum sodium, potassium, deoxycorticosterone (DOC), aldosterone, and plasma renin activity (PRA) were determined. These variables were observed in a total of 10 experimental and nine control pigs. All animals were uninephrectomized and fed a diet of Purina Pig Chow and tap water ad libitum. No salt was added to the food or water. Serum DOC levels rose dramatically on the day of the implantation, then gradually declined but remained approximately 10 times greater than control levels 40 days after implant. Plasma renin activity was suppressed rapidly and completely, whereas aldosterone fell only slowly to about half its control value. Sodium retention was maximum during the first 24 hours. Therefore an "escape" process became operative, causing sodium balance to return to normal after the third day, at which time the major rise in arterial pressure occurred. A marked increase in water turnover (intake and output) also began after the third day and persisted throughout the experimental period. Water balance remained normal during this period of increased turnover. Hypokalemia developed in the absence of kaliuresis, suggesting that potassium moved into the cells. Except for the potassium retention, these changes parallel the abnormalities seen in other states of mineralocorticoid excess.

Electrolyte and hormonal effects of deoxycorticosterone acetate in young pigs.