Anesthesia for Young Brains?

When infants or young children need surgery, does anesthesia affect their developing brains?

With more than 1 million children under age 4 requiring anesthesia for surgery in the United States each year, the Food and Drug Administration (FDA) and other health organizations are working together to answer this question.

Previous scientific studies in young animals have shown that commonly used anesthetics can be harmful to the developing brain. However, results have been mixed in children. Some studies of infants and young children undergoing anesthesia have reported long-term deficits in learning and behavior; other studies have not.

These conflicting results show that more research is needed to fully understand the risks anesthesia may pose to very young patients.

To close these research gaps, FDA and the International Anesthesia Research Society (IARS) started an initiative called SmartTots (Strategies for Mitigating Anesthesia-Related neuroToxicity in Tots). SmartTots seeks to ensure that children under age 4 will be as safe as possible when they need anesthesia during surgery. Studies have shown that this is a period of significant brain development in young children.

“Our hope is that research funded through SmartTots will help us design the safest anesthetic regimens possible,” says Bob Rappaport, M.D., director of the Division of Anesthesia, Analgesia and Addiction Products at FDA. “This research can potentially foster the development of new and safer anesthetic drugs for use in pediatric medicine.”

According to SmartTots steering committee co-chair James Ramsay, M.D., young children usually do not undergo surgery unless the procedure is vital to their health. “Therefore, postponing a necessary procedure may itself lead to significant health problems and may not be an option for the majority of children,” Ramsey says.

Ongoing Research

SmartTots was launched in 2010 in part to fund research that would build on the work done at FDA and several universities.

Since 2003, Merle Paule, Ph.D., director of the Division of Neurotoxicology at FDA’s National Center for Toxicological Research (NCTR), and colleagues have been exploring the effects of ketamine—an anesthetic commonly used on children-on the brains and learning ability of young rhesus monkeys.

“Earlier research has shown that exposing young rat pups to ketamine caused learning problems when they became adults, but we wanted to see what would happen with primates,” said Paule. Primates, such as the rhesus monkey used in this research, more closely resemble humans in physiology and behavior. All animal procedures were approved by the NCTR Institutional Animal Care and Use Committee, and conducted in accordance with the Public Health Service Policy on the Humane Care and Use of Laboratory Animals.

“The learning of concepts such as matching (see a triangle, match it with another triangle from among other symbols) took much longer in the ketamine-treated monkeys And even after basic concepts were learned, the ketamine-exposed animals performed less accurately than animals in the control group,” Paule says.

The same holds true for the test monkeys even today, Paule says. Six years after their ketamine treatment, they’re still showing below-normal brain function.

What might that mean for young children who have been exposed to ketamine or other anesthetics during surgery?

“We can’t know with certainty at this time,” says Rappaport, a member of the steering committee that coordinates, manages and oversees the SmartTots initiative. “We need to definitively answer the questions of whether anesthetic use in children poses a risk to their development and, if so, under what circumstances.”

FDA and other health-related organizations recognize the importance of learning more on this topic. For example, do other forms of anesthesia similarly affect the brain’s ability to, learn and remember? How long might these deficits last?

Safety Problems With Your Medical Device

As technology provides more health care options, children are frequently diagnosed or treated with one or more medical devices.

If there are problems that prevent the safe use of pediatric medical devices, FDA wants to know about them. FDA wants caregivers to report problems or concerns to help ensure that pediatric devices can be used safely and deliver the intended benefits. And the agency wants to hear about the problems when they happen, especially if they might jeopardize the safety or care of a child.

Many Kinds of Devices

Medical devices range from the simple items in your medicine cabinet, like adhesive bandages, to complicated equipment, such as X-ray machines and pacemakers. Devices such as syringes and asthma inhalers help with the delivery of a drug or vaccine. Devices may be disposable, reusable or even implantable, such as cochlear implants (for severe hearing loss) and joint replacements. Devices might monitor a child’s breathing, oxygen level, blood sugar level or blood pressure.

Although adolescents and some older children may be involved with using their devices, often a parent or other adult will either need to supervise or be the primary user. FDA’s Center for Devices and Radiological Health (CDRH) considers patients through age 21 to be pediatric device users.

FDA has developed and administers regulations designed to ensure the safety and effectiveness of medical devices. Nevertheless, parents and caregivers should be aware of the potential for problems that may lead to the device working improperly, interfere with its effectiveness, or even harm the child. Some problems may be a result of a device not working as it should, while others might happen because of the way the parent or child uses the device. If a device is not easy to use, a child or caregiver could experience problems operating the device, which could in turn lead to an injury.

Inattentiveness and Hyperactivity

Attention deficit hyperactivity disorder (ADHD) and attention deficit disorder (ADD) symptoms may begin in childhood and continue into adulthood. There are three types of ADHD:

  • Hyperactive-impulsive ADHD makes children appear to be in constant motion. Their bodies — and mouths — are always going, as if driven by a motor.
  • Inattentive ADHD makes it hard for children to focus and pay attention.
  • Combined ADHD is identified by the presence of both hyperactive-impulsive and inattentive symptoms.

Inattentiveness and hyperactivity usually begins in childhood but may continue into the adult years. It is the most commonly diagnosed behavioral disorder in children. Inattentiveness and hyperactivity is diagnosed much more often in boys than in girls.