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Sodium restriction versus daily maintenance replacement in very low birth weight premature neonates: a randomized,
A T Costarino1, J A Gruskay, L Corcoran
1Department of Anesthesiology, University of Pennsylvania School of Medicine, Philadelphia.
Insights
Restricting sodium intake in premature infants helps prevent high sodium levels and reduces the need for excessive fluids. This approach may also lower the risk of bronchopulmonary dysplasia.
Area of Science:
- Neonatalogy
- Pediatric Nephrology
- Intensive Care Medicine
Background:
- Premature infants are at risk for fluid and electrolyte imbalances.
- Hypernatremia and large fluid administration are common challenges in neonatal intensive care.
Purpose of the Study:
- To evaluate if restricting sodium intake in early life prevents hypernatremia and reduces parenteral fluid administration in premature infants.
- To assess the impact of sodium restriction on electrolyte balance and clinical outcomes.
Main Methods:
- Prospective randomized blind study of 17 premature infants (27 weeks gestation, 850g).
- Infants were assigned to receive either daily maintenance sodium or sodium restriction for 5 days.
- Parenteral fluid intake was physician-prescribed, and sodium balance and serum sodium levels were monitored.
Main Results:
- Sodium-restricted infants had a significantly more negative sodium balance due to high urinary sodium excretion (p<0.001).
- Maintenance sodium group infants showed elevated serum sodium levels (p<0.001) and a tendency for increased fluid prescription.
- Hypernatremia occurred in 2 sodium-supplemented infants; hyponatremia in 2 sodium-restricted infants. Restricted infants had more normal serum osmolality (p<0.05).
- Lower incidence of bronchopulmonary dysplasia in sodium-restricted infants (p<0.02).
Conclusions:
- Sodium restriction in tiny premature infants may simplify fluid therapy by preventing hypernatremia.
- This approach can help avoid excessive parenteral fluid administration.
- Sodium restriction is associated with a reduced incidence of bronchopulmonary dysplasia in this vulnerable population.
Abstract:
To test the hypothesis that restriction of sodium intake during the first 3 to 5 days of life will prevent the occurrence of hypernatremia and the need for administration of large fluid volumes, we prospectively and randomly assigned 17 babies (mean +/- SD: 850 +/- 120 gm; 27 +/- 1 weeks of gestation) to receive in blind fashion either daily maintenance sodium or salt restriction with physician-prescribed parenteral fluid intake. Maintenance-group infants received 3 to 4 mEq of sodium per kilogram per day; restricted infants received no sodium supplement other than with such treatments as transfusion. Sodium balance studies conducted for 5 days demonstrated that maintenance salt intake resulted in a daily sodium balance near zero, whereas sodium-restricted infants continued to excrete urinary sodium at a high rate, which promoted a more negative balance (average daily sodium balance -0.30 +/- 1.78 SD in maintenance group vs -3.71 +/- 1.47 mEq/kg per day in restriction group; p less than 0.001). Care givers tended to prescribe daily increases in parenteral fluids for the salt-supplemented infants, perhaps because serum sodium concentrations were elevated in these infants after the first day of the study (p less than 0.001). Hypernatremia developed in two sodium-supplemented infants (greater than 150 mEq/L), and hyponatremia developed in two sodium-restricted infants (less than 130 mEq/L); however, the restricted infants were more likely to have normal serum osmolality (p less than 0.05). Both groups of infants produced urine that was neither concentrated nor dilute, with a high fractional excretion of sodium; renal failure was not observed. The mortality rate was not affected, but the incidence of bronchopulmonary dysplasia was significantly less in the sodium-restricted babies (p less than 0.02). We conclude that in tiny premature infants, a fluid regimen that restricts sodium may simplify parenteral fluid therapy targeted to prevent hypernatremia and excessive administration of parenteral fluids.