Droperidol transiently prolongs the QT interval in children undergoing single ventricle palliation

Area of Science:

• Cardiology
• Pediatric Anesthesiology
• Pharmacology

Background:

• Droperidol was historically used for pediatric sedation but its use declined due to FDA warnings about arrhythmogenic potential.
• Single ventricle palliation involves complex cardiac surgeries in critically ill children, often requiring intensive anesthetic management.

Purpose of the Study:

• To investigate the hypothesis that neuroleptic dose droperidol administration during volatile anesthesia transiently prolongs the corrected QT interval (QTc) in pediatric patients undergoing single ventricle palliation.
• To assess the safety of droperidol in this specific high-risk population by monitoring for arrhythmias.

Main Methods:

• A prospective study involving 62 children undergoing stage 2 or 3 single ventricle palliation.
• Electrocardiograms (ECGs) were recorded preoperatively, after volatile anesthesia induction, after a 30-minute intravenous infusion of droperidol (75 mcg/kg), and in the cardiac intensive care unit.
• QT intervals were corrected for heart rate using Bazett and Friderici formulae (QTc), and perioperative arrhythmias were documented.

Main Results:

• Volatile anesthesia alone was associated with significant QTc interval prolongation.
• Administration of droperidol resulted in further significant, albeit transient, QTc prolongation.
• Postoperative QTc intervals, while prolonged compared to baseline, were significantly shorter than immediately post-droperidol.

Conclusions:

• Neuroleptic dose droperidol administration during volatile anesthesia in pediatric single ventricle palliation is associated with significant, transient QTc prolongation.
• This QTc prolongation did not result in Torsades de Pointes (TdP) or other ventricular arrhythmias in the studied population.
• The findings suggest careful monitoring may allow for the judicious use of droperidol in this specific patient group.