Relation between plasma and red-cell electrolyte concentrations and digoxin levels in children

Area of Science:

• Pediatric Cardiology
• Clinical Pharmacology
• Biochemistry

Background:

• Digoxin is a cardiac glycoside used to treat heart failure.
• Electrolyte balance is crucial for cardiac function.
• Digoxin toxicity can lead to serious adverse effects.

Purpose of the Study:

• To investigate the impact of digoxin on red-cell electrolyte concentrations in children.
• To identify electrolyte alterations associated with digoxin administration and toxicity.

Main Methods:

• Measured plasma and red-cell electrolyte concentrations (sodium and potassium) in children.
• Compared electrolyte levels in children with heart failure, those on maintenance digoxin, those with digoxin toxicity, and healthy controls.

Main Results:

• Digoxin therapy significantly increased red-cell sodium and decreased red-cell potassium.
• Children with digoxin toxicity exhibited higher red-cell sodium and lower red-cell potassium compared to nontoxic patients.
• The ratio of red-cell sodium to potassium was significantly higher in toxic patients.

Conclusions:

• Red-cell electrolyte alterations are sensitive indicators of digoxin's effects.
• Monitoring red-cell sodium and potassium levels may aid in detecting digoxin toxicity in pediatric patients.