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Can Anesthesia Affect A Child's IQ?

Several studies show little evidence that a single anesthetic is associated with significant harm.

Can Anesthesia Affect A Child

Children were given anesthesia once under age 3 report more problems with mental skills

HIGHLIGHTS

  1. There is no link between surgical anesthesia and low IQ in children
  2. Multiple exposures to anesthesia had modest declines in fine motor skills
  3. Children who had anesthesia under 3 reported executive skill problems

A Mayo Clinic study has found no link between surgical anesthesia and low IQ in children. A more complex picture emerges among people who had anesthesia several times as small children: Although their intelligence is comparable, they score modestly lower on tests measuring fine motor skills, and their parents are more likely to report behavioral and learning problems. Mayo researchers studied 997 people born from 1994 through 2007 in Olmsted County, Minnesota. They were grouped according to the anesthesia exposures they had before their third birthdays: 206 had two or more; 380 had one, and 411 had none. Ear, nose and throat procedures were the most common surgeries.

The researchers used the Rochester Epidemiology Project medical records to assess database, brain function testing at ages 8-12 or 15-20, and parent reports behavior and brain function. Beyond their anesthesia exposure, the three groups of patients were matched to be as similar as possible.

Intelligence, memory, and several other measures of brain function were similar among the groups.



However, those with multiple exposures to anesthesia had modest declines in fine motor skills, such as the ability to draw figures with a pencil, and how quickly they processed information when reading. Their parents reported more learning and behavioral problems, such as difficulty reading; behaviors consistent with attention deficit hyperactivity disorder; breaking rules; or displaying aggression, anxiety or social withdrawal.

Parents whose children had anesthesia once under age 3 reported more problems with mental skills known as executive functions - skills that help with memory, impulse control, planning and flexibility - but not with other behaviors.

"For the majority of kids undergoing surgery, the results overall are reassuring," says lead author David Warner. "About 80 percent of kids who need surgery under age 3 only need one, and it's relatively brief."

Several other studies also show little evidence that a single anesthetic is associated with significant harm.

"Although we do have some concerns about the children who are receiving multiple anesthetics, it's important to note that our results don't allow us to conclude that anesthesia itself is causing problems," Dr. Warner says, adding that other factors, such as the conditions that make surgery necessary, could contribute.

In the meantime, in most cases the benefit of surgery outweighs any risk, Dr. Warner says. However, the potential for problems may need to be part of the decision-making process when parents and surgeons discuss surgery, he adds.

The findings are published in Anasthesiology. 

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