Clinical Factors Associated with Dose of Loop Diuretics After Pediatric Cardiac Surgery: Post Hoc Analysis

Area of Science:

• Pediatric Cardiology
• Nephrology
• Critical Care Medicine

Background:

• Infants undergoing cardiac surgery with cardiopulmonary bypass often require diuretics.
• Understanding factors associated with diuretic dose is crucial for optimizing treatment in this vulnerable population.
• Loop diuretics like furosemide and ethacrynic acid are commonly used.

Purpose of the Study:

• To identify clinical factors associated with diuretic dose in infants with congenital heart disease after cardiac surgery.
• To explore the relationship between diuretic dose and clinical outcomes such as urine output.
• To investigate potential early resistance to continuous loop diuretic infusion.

Main Methods:

• Post hoc analysis of a randomized controlled trial comparing furosemide and ethacrynic acid.
• Inclusion of 67 infants undergoing cardiac surgery with cardiopulmonary bypass.
• Analysis of demographic, surgical, and laboratory data, including diuretic dose, urine output, creatinine, and blood pH.

Main Results:

• Diuretic dose significantly decreased over postoperative days, while the ratio of urine output to diuretic dose increased.
• Factors associated with diuretic dose included age, weight, cross-clamp time, ethacrynic acid administration, creatinine, renal near-infrared spectroscopy saturation, neutrophil gelatinase-associated lipocalin, pH, urinary volume, and fluid balance.
• Multivariable analysis identified cross-clamp time, ethacrynic acid use, and blood pH as independently associated with diuretic dose.

Conclusions:

• Early resistance to continuous loop diuretic infusion is observed in infants post-cardiac surgery.
• Higher diuretic doses are administered to patients with lower urine output.
• Cross-clamping time, ethacrynic acid, and blood pH are independently associated with diuretic dose in this population.