EC: Anesthetic Neurotoxicity

Provocative & Possibly Problematic

The medical profession is currently concerned about the possibility of anesthetic neurotoxicity in children who are exposed to anesthetic agents at an early age. Animal data from anesthesia research literature has shown that anesthetic agents may cause potential harm to young, developing neurologic systems. Even though young mammalian animals are very different from human babies and children, the possibility of potential anesthetic neurotoxicity is of genuine concern.

A few points to consider:

  • Children often require surgical procedures that are not elective (trauma, infection, tumors, etc).
  • Most young children require general anesthesia to carry out necessary surgical procedures.
  • Not performing the indicated surgical procedure(s) or delaying the procedures until they are older, may lead to significant developmental delays.
  • There are many variables that must be considered:
    • Types of anesthetic agents
    • Number of anesthesias at various ages
    • Age, year and quartile of birth
    • Maternal age at birth and socioeconomic level
    • Gestational age
    • Rurality of residence
    • Sex
    • Nature of the illness being treated
    • Associated and non-associated co-morbidities
    • Age range to study and continued longitudinal data as the child ages
    • Validity of the assessment tests used to determine developmental status
    • Method of statistical analysis, method of studying cohorts and cohort matching, etc.

At this time, medicine does not know the answers to the many questions related to this topic. However, very thoughtful physicians and researchers are asking the right questions and are seeking some answers. The answers will help to establish guidelines.

Children of all ages require surgical interventions for serious problems and require anesthetic agents in order for those procedures to be performed safely and properly.

  • Non-elective procedures should be performed in a timely manner to decrease exposure time.
  • Exposure to the fewest anesthetic procedures possible should be the goal
  • Combining several surgical procedures during one anesthesia exposure should be considered, if it is safe for the child

Research studies are ongoing concerning this topic. The issue is provocative and potentially problematic. We need more studies on humans and need to be very cognizant of the current dilemma.

Two recent studies with very large groups of children, O'Leary et al. (Canada) and Glatz et al. (Sweden), have shown no statistically significant affect of pediatric anesthesia on children younger than 4 years in terms of any long term cognitive impairments. Both studies had large "N's" and school testing data.

Such reports are very important as we continue to study and evaluate the issue.

References:

1. Wilder RT, et al. Early exposure to anesthesia and learning disabilities in a population-based birth cohort. Anesthesiology 2009 April ; 110(4): 796–804. Click here for a .pdf copy.

2. Rapport BA, et al. Anesthetic neurotoxicity - Clinical implications of animal models. NEJM, Feb 26, 2015, 372:9:796-797. Click here for a .pdf copy.

3. O'Leary JD, et al. A population-based study evaluating the association between surgery in early life and child development at primary school entry. Anesthesiology 2016, 125;2:272-278. Click here for a .pdf copy.

4. Glatz P, MD; Sandin RH, Pedersen NL, Bonamy AK, Eriksson LI, Granath F. Association of Anesthesia and Surgery During Childhood With Long-term Academic Performance. JAMA Pediatr. doi:10.1001/jamapediatrics.2016.3470
Published online November 7, 2016. Click here for a .pdf copy.