Bradycardia during anesthesia in infants. An epidemiologic study

Area of Science:

• Anesthesiology
• Pediatric Medicine
• Critical Care

Background:

• Bradycardia during infant anesthesia is not well-documented.
• This study aimed to determine its frequency, causes, and associated morbidity in infants compared to older children.

Purpose of the Study:

• To quantify the incidence of bradycardia in infants (0-1 year) undergoing anesthesia.
• To identify causes, morbidity, and contributing factors for bradycardia in this age group.
• To compare bradycardia rates in infants versus older children.

Main Methods:

• Analysis of 7,979 anesthetic records for noncardiac surgeries in patients aged 0-4 years.
• Focus on 4,645 anesthetics in infants (0-1 year) with heart rates <100 bpm.
• Logistic regression used to identify factors influencing bradycardia frequency, including patient and surgical characteristics, and anesthesiologist supervision.

Main Results:

• Bradycardia occurred in 1.27% of infants, significantly higher than in older children (0.65% at 3 years, 0.16% at 4 years).
• Primary causes in infants: disease/surgery (35%), inhalation agent dose (35%), hypoxemia (22%).
• Morbidity included hypotension (30%), asystole/ventricular fibrillation (10%), and death (8%). Higher ASA status and longer surgeries were associated factors. Presence of a pediatric anesthesiologist reduced likelihood by over 50%.

Conclusions:

• Infants experience higher rates of bradycardia during anesthesia, with considerable associated morbidity.
• Risk factors include patient's health status, surgery duration, and lack of specialized pediatric anesthesia supervision.
• Specialized pediatric anesthesia care is associated with a reduced incidence of intraoperative bradycardia in infants.