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Anesthesia, if limited, can be safe for baby's brain

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Anesthesia during a short surgery doesn’t harm a baby’s brain development, according to an experiment involving hundreds of infants in seven countries.

While the study can’t answer broader safety questions about repeated or prolonged anesthesia, it may ease the worries of millions of parents whose children have been put to sleep for common procedures.

“These findings should be reassuring,” said Dr. Mary Ellen McCann of Boston Children’s Hospital. An hour of surgery with general anesthesia “is safe for your child in early infancy.” She helped lead the study published Thursday in the medical journal Lancet .

It involved 447 babies needing hernia repairs. The babies, mostly boys, were randomly assigned to get either anesthesia with gas, or an injection that blocks sensation below the waist.

Since both techniques are commonly used, it was ethical for the researchers to set up an experiment. They found no evidence of harm to brain development when they tested the children at age 2.

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Finally, at age 5, the children took IQ tests and both groups’ average scores were in the normal range. There were no differences in parent-reported problems such as autism, attention deficit disorder or speech delays.

“The level of evidence is strong,” said Dr. Santhanam Suresh of Lurie Children’s Hospital in Chicago, who wasn’t involved in the research. The findings mean doctors “should not shy away from using general anesthesia in children undergoing simple pediatric procedures.”

Since 84 percent of the babies in the study were boys, it’s unclear how the results apply to girls.

In the study, the anesthesia lasted less than an hour on average. Longer exposure could be more dangerous, as could anesthesia for multiple surgeries, McCann said, so it’s unlikely the Food and Drug Administration will change existing warning labels on anesthesia drugs for children.

Uncertainty about the drugs stems from studies showing brain damage in baby animals. Figuring out how these drugs affect children has been difficult, though, because very sick kids who get the most anesthesia also have other problems that can cause trouble with learning. That makes it tough for scientists to sort out what causes problems.

Funding came from government and scientific groups in the United States, Australia, Canada, New Zealand, Italy, the United Kingdom and the Netherlands.

Next, other researchers will study a new combination of anesthetic drugs in another randomized experiment , but those results won’t be known for several years.

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Follow AP Medical Writer Carla K. Johnson on Twitter: @CarlaKJohnson

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The Associated Press Health & Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content.

The Western Journal has not reviewed this Associated Press story prior to publication. Therefore, it may contain editorial bias or may in some other way not meet our normal editorial standards. It is provided to our readers as a service from The Western Journal.

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