To evaluate QTc interval prolongation in pediatric patients with eating disorders and assess the association with demographic factors, ECGs, electrolyte levels, and QTc-prolonging medications.
Approach:
Study Design: Retrospective chart review of pediatric patients with eating disorders at a tertiary children's hospital.
Data Analysis: Analysis of demographic factors, ECGs, electrolyte levels, and use of QTc-prolonging medications.
Key Findings:
Among 435 patients, 405 had normal QTc intervals (460 ms) using the Bazett calculation.
Mean QTc values differed significantly across eating disorder subtypes (p = 0.0063), with the longest values observed in bulimia nervosa and binge eating disorder, and the shortest in anorexia nervosa.
Patients taking one or more QTc-prolonging medications had a longer mean QTc interval than those not taking medications (p < 0.001).
There were significant inverse correlations between serum calcium (p = 0.0001), magnesium (p = 0.01), and potassium (p = 0.003) levels and QTc length.
Interpretation:
QTc-prolonging medications and electrolyte abnormalities are associated with longer QTc intervals in pediatric patients with eating disorders.
Limitations:
Retrospective design may limit causative conclusions.
Potential confounding factors not fully explored.
Conclusion:
Monitoring QTc intervals and electrolyte levels is important in pediatric patients with eating disorders.
