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General Anesthesia in the First 36 Months of Life
Christina Schüttler1, Tino Münster, Christine Gall
1Chair of Medical Informatics, Friedrich-Alexander-Universität, Erlangen-Nürnberg, Germany; Clinic for Anesthesia and Intensive Care Medicine, Hospital Barmherzige Brüder, Regensburg, Germany, Germany; Department of Medical Informatics, Biometry and Epidemiology, Friedrich-Alexander-Universität, Erlangen-Nürnberg, Germany; Neuropediatrics at the Department of Pediatric and Adolescent Medicine at the University Hospital of Erlangen, Friedrich-Alexander-Universität, Erlangen-Nürnberg, Germany; Anesthesiology Department, University Hospital of Erlangen, Germany.
Insights
General anesthesia in early childhood did not show markedly reduced intelligence, but non-inferiority to unexposed children was not demonstrated. This study focused on the effects of anesthetic drugs on infant brain development and IQ scores.
Area of Science:
- Pediatric Anesthesiology
- Neurodevelopmental Pediatrics
- Developmental Neuroscience
Background:
- The developing brain is highly susceptible to external harmful substances.
- Concerns exist regarding the impact of anesthetic drugs on brain growth and development.
- Clinical studies in young children are crucial for understanding anesthetic effects.
Purpose of the Study:
- To investigate the long-term effects of general anesthesia exposure before age 3 on intelligence quotient (IQ).
- To compare IQ scores in children exposed to general anesthesia versus a non-exposed control group.
- To determine if general anesthesia exposure is non-inferior to no exposure in terms of cognitive outcomes.
Main Methods:
- Retrospective evaluation of general anesthesia exposure in children born 2007-2011.
- Prospective assessment of intelligence quotient (IQ) as the primary outcome.
- Comparison with a control group of children without anesthesia exposure, with a non-inferiority threshold of 5 IQ points.
Main Results:
- 430 exposed children and 67 controls provided complete data.
- Exposed group mean IQ: 108.2; Control group mean IQ: 113.
- Adjusted difference was 2.9 IQ points favoring the control group; non-inferiority was not met.
Conclusions:
- Higher IQ scores in both groups may be due to study selection (full-term infants).
- General anesthesia in early childhood is not linked to significantly lower intelligence later in life.
- While non-inferiority was not demonstrated, anesthesia did not cause markedly reduced intelligence.
Background:
Experimental data have shown that the developing brain is especially vulnerable to exogenous noxious substances. The potential effects of anesthetic drugs on brain growth and development are a matter of concern. Clinical studies of children who underwent general anesthesia in their earliest years can make a major contribution to our understanding of the effects of anesthetic drugs on infants and toddlers (i.e., children under age 5).
Methods:
Children born at term during the years 2007-2011 who were exposed to general anesthesia before their third birthday were included in the study. Data on general anesthesia were retrospectively evaluated, and the overall intelligence quotient (IQ) was determined prospectively as the primary target parameter. Children who had not been exposed to general anesthesia were recruited as a control group. The non-inferiority threshold was set at a difference of 5 IQ points out of a consideration of clinical relevance.
Results:
430 complete data sets were available from exposed children and 67 from members of the control group. The exposed group achieved a mean IQ score of 108.2, with a 95% confidence interval of [107; 109.4]; the corresponding values in the control group were 113 [110; 116.1]. Both groups achieved a mean score that was higher than the expected 100 points. After adjustment for age, socioeconomic status, and sex, the difference between the two groups was 2.9 points [0.2; 5.6], indicating a significantly better outcome in the control group than in the exposed group. The non-inferiority threshold of 5 IQ points was within the confidence interval; thus, non-inferiority was not demonstrated.
Conclusion:
The fact that both groups achieved a higher IQ score than the expected 100 points may be attributable, at least in part, to the restriction of the study to children born at term. The results indicate that general anesthesia in early childhood is not associated with markedly reduced intelligence in later years, although noninferiority could not be demonstrated.
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