Consequences of General Anesthesia in Infancy on Behavior and Brain Structure.

Area of Science:

• Neuroscience
• Developmental Biology
• Anesthesiology

Background:

• General anesthesia (GA) is administered to 1 in 7 children before age 3.
• The potential neurotoxicity of anesthetics in developing brains remains a subject of debate.
• Investigating lasting behavioral and structural brain changes after early-life GA exposure is crucial.

Purpose of the Study:

• To determine if early-life exposure to general anesthesia (GA) causes enduring behavioral and structural changes in the developing brain.
• To evaluate the impact of postnatal GA on fear behavior, emotional control, and specific brain regions.

Main Methods:

• A preclinical study assessed behavioral and anatomical changes in mice exposed to GA during early development using magnetic resonance imaging (MRI).
• A human cohort study (APEX) analyzed behavioral and MRI data from children (9-10 years old) with and without infant GA exposure.
• Behavioral assessments included fear conditioning, Y-maze, actimetry, and executive function tests; brain anatomy was evaluated using high-resolution MRI.

Main Results:

• Mice exposed to postnatal GA exhibited chronic exacerbated fear behavior and an 11% reduction in periaqueductal gray matter.
• Human subjects exposed to a single infant GA showed trends toward lower emotional control and a 6.1% reduction in the posterior right inferior frontal gyrus.
• Statistical significance was observed for structural changes in both animal models (P = .046) and humans (P = .019).

Conclusions:

• Preclinical and clinical findings suggest that early-life exposure to anesthetics can lead to persistent effects on emotional control.
• These studies indicate potential long-term impacts of GA on brain structures, specifically the periaqueductal gray matter and the inferior frontal gyrus.
• Further research is warranted to fully understand the implications of early-life GA exposure on neurodevelopment.