Body electrolytes in bronchopulmonary dysplasia and the effects of diuretic therapy

Area of Science:

• Pediatric Nephrology
• Neonatology
• Pulmonology

Background:

• Bronchopulmonary dysplasia (BPD) is a chronic lung disease in preterm infants.
• Electrolyte and hormone imbalances are common in BPD, affecting fluid balance.
• Understanding these imbalances is crucial for effective management.

Purpose of the Study:

• To investigate body electrolytes and regulatory hormones in preterm infants with BPD.
• To compare infants with and without diuretic treatment.
• To compare BPD infants with healthy controls.

Main Methods:

• Studied body electrolytes and regulatory hormones in three groups of infants: healthy controls (Group I), BPD infants not treated with diuretics (Group II), and BPD infants treated with diuretics (Group III).
• Analyzed serum and urinary electrolytes (Na, K), specific gravity, flow rate, and fractional excretion of sodium (FeNa).
• Measured serum aldosterone levels and assessed correlations between electrolytes, hormones, and fluid balance.

Main Results:

• Group II infants showed lower serum Na, higher Na intake needs, higher urinary Na concentration, and higher specific gravity, suggesting impaired urine dilution.
• Group III infants had higher serum Na and lower urinary specific gravity compared to Group II, with values similar to controls.
• Aldosterone levels were highest in Group II, with significant negative correlations between serum Na and aldosterone, and between FeNa and aldosterone in BPD groups.

Conclusions:

• Preterm infants with BPD may have an impaired ability to dilute urine, leading to body water retention.
• Water restriction and diuretic therapy are indicated as reasonable therapeutic approaches for managing fluid balance in BPD.
• Hormonal regulation, particularly involving aldosterone, plays a role in electrolyte and fluid disturbances in BPD.