Modification of chronotropic response to anticholinergics by halogenated anaesthetics in children

Area of Science:

• Anesthesiology
• Pediatric Cardiology

Background:

• Anticholinergic medications like atropine and glycopyrrolate are used to manage bradycardia and secretions during anesthesia.
• Halothane and enflurane are volatile anesthetic agents with differing effects on the cardiovascular system.

Purpose of the Study:

• To compare the effects of atropine and glycopyrrolate on heart rate and rhythm in children.
• To evaluate the influence of halothane versus enflurane anesthesia on anticholinergic-induced tachycardia in pediatric patients.

Main Methods:

• 40 pediatric patients received intravenous atropine or glycopyrrolate post-induction with halothane or enflurane.
• Standardized premedication and controlled ventilation to maintain normal end-tidal carbon dioxide levels were employed.
• Cardiac rate, rhythm, and occurrence of arrhythmias were monitored.

Main Results:

• Heart rate increased in all children after anticholinergic administration.
• The increase in heart rate was significantly greater in the halothane group compared to the enflurane group.
• No significant difference in heart rate increase was observed between atropine and glycopyrrolate.
• Junctional tachycardia was the sole arrhythmia observed, with no significant difference in frequency across groups.

Conclusions:

• Enflurane anesthesia combined with anticholinergic drugs leads to less pronounced tachycardia than halothane in pediatric patients.
• This combination may be advantageous in pediatric anesthesia when minimizing tachycardia is a clinical concern.