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Early exposure to anesthesia and learning disabilities in a population-based birth cohort
Robert T Wilder1, Randall P Flick, Juraj Sprung
1Department of Anesthesiology, College of Medicine, Mayo Clinic, Rochester, Minnesota 55905, USA.
Insights
Multiple anesthetics before age 4 increase learning disability (LD) risk in children. Single anesthetic exposure showed no association with LD development. Further research is needed to confirm causality.
Area of Science:
- Pediatric Anesthesiology
- Developmental Neurobiology
- Educational Psychology
Background:
- Anesthetic drugs may impact immature brain development and behavior.
- Previous studies suggest potential links between early anesthetic exposure and neurodevelopmental outcomes.
- This study investigates the association between early anesthesia and learning disabilities (LD).
Purpose of the Study:
- To determine if exposure to general anesthesia before age 4 is associated with the development of reading, written language, and math learning disabilities.
- To quantify the risk of LD associated with varying levels of anesthetic exposure in early childhood.
Main Methods:
- Population-based, retrospective birth cohort study.
- Reviewed educational and medical records of children born between 1976-1982 in Olmsted County, MN.
- Used Cox proportional hazards regression to analyze anesthetic exposure as a predictor of LD, adjusting for covariates.
Main Results:
- Of 5,357 children, 593 received general anesthesia before age 4.
- Single anesthetic exposure was not linked to increased LD risk (HR=1.0).
- Multiple anesthetics (2 or 3+) significantly increased LD risk (HR=1.59 and 2.60, respectively); risk rose with cumulative exposure duration (P=0.016).
Conclusions:
- Multiple anesthetic exposures in early childhood are a significant risk factor for later learning disabilities.
- The study cannot definitively establish if anesthesia causes LD or if it's a marker for other contributing factors.
- Findings highlight the need for careful consideration of anesthesia use in young children.
Background:
Anesthetic drugs administered to immature animals may cause neurohistopathologic changes and alterations in behavior. The authors studied association between anesthetic exposure before age 4 yr and the development of reading, written language, and math learning disabilities (LD).
Methods:
This was a population-based, retrospective birth cohort study. The educational and medical records of all children born to mothers residing in five townships of Olmsted County, Minnesota, from 1976 to 1982 and who remained in the community at 5 yr of age were reviewed to identify children with LD. Cox proportional hazards regression was used to calculate hazard ratios for anesthetic exposure as a predictor of LD, adjusting for gestational age at birth, sex, and birth weight.
Results:
Of the 5,357 children in this cohort, 593 received general anesthesia before age 4 yr. Compared with those not receiving anesthesia (n = 4,764), a single exposure to anesthesia (n = 449) was not associated with an increased risk of LD (hazard ratio = 1.0; 95% confidence interval, 0.79-1.27). However, children receiving two anesthetics (n = 100) or three or more anesthetics (n = 44) were at increased risk for LD (hazard ratio = 1.59; 95% confidence interval, 1.06-2.37, and hazard ratio = 2.60; 95% confidence interval, 1.60-4.24, respectively). The risk for LD increased with longer cumulative duration of anesthesia exposure (expressed as a continuous variable) (P = 0.016).
Conclusion:
Exposure to anesthesia was a significant risk factor for the later development of LD in children receiving multiple, but not single anesthetics. These data cannot reveal whether anesthesia itself may contribute to LD or whether the need for anesthesia is a marker for other unidentified factors that contribute to LD.
