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Calcium-dependent aldosterone secretion in anephric and nonnephrectomized patients on regular hemodialysis
Insights
Continuous calcium infusion significantly increases plasma aldosterone in hemodialysis patients without kidneys. Ionized calcium levels directly influence aldosterone in uremic patients undergoing hemodialysis.
Area of Science:
- Nephrology
- Endocrinology
- Mineral Metabolism
Background:
- Patients with chronic kidney disease often have altered calcium metabolism.
- Hemodialysis can impact mineral balance and hormonal regulation.
Purpose of the Study:
- To investigate the impact of continuous calcium infusion on aldosterone, renin activity, and cortisol.
- To compare these effects in anephric (kidney removed) versus non-nephrectomized hemodialysis patients.
Main Methods:
- Administered continuous calcium infusion to both anephric and non-nephrectomized hemodialysis patients.
- Monitored whole blood ionized calcium (b-Ca2+), plasma aldosterone (PAC), plasma cortisol, and renin activity.
- Analyzed changes in electrolyte concentrations (potassium, sodium).
Main Results:
- Significant increase in b-Ca2+ observed in both patient groups.
- Non-nephrectomized patients showed a significant PAC increase correlated with b-Ca2+.
- Anephric patients exhibited a smaller, non-significant PAC increase; no significant changes in cortisol or renin activity.
Conclusions:
- Ionized calcium directly influences plasma aldosterone levels in uremic patients undergoing hemodialysis.
- The presence of kidneys may play a role in the aldosterone response to calcium infusion.
Abstract:
The present study was undertaken to investigate the effect of a continuous calcium infusion on the plasma levels of aldosterone, renin activity, and cortisol in six anephric and four nonnephrectomized patients on regular hemodialysis. In both groups, a significant increase in whole blood ionized calcium (b-Ca2+) was demonstrated. A significant increase in plasma aldosterone (PAC) was noted in the nonnephrectomized patients, in whom the rise in PAC correlated with the increase in b-Ca2+. However, in the anephric patients only a smaller and insignificant increase in PAC was found. No significant changes were demonstrated in plasma cortisol or renin activity, nor in potassium or sodium concentrations in either group. It is concluded that ionized calcium influences the plasma levels of aldosterone in uremic patients on regular hemodialysis.