New Study Refine Guidelines for Pediatric Brain Injuries

Measuring carbon dioxide level through the artery can be more effective than the noninvasive method for pediatric brain injuries, finds a new study.

Measuring and regulating the child's level of carbon dioxide is crucial to ensuring the brain is getting enough blood oxygen to prevent a secondary brain injury. The findings of the study are published in the journal JAMA.

When a //child suffers from head trauma, medical professionals are in high gear to prevent further damage to a developing brain. High carbon dioxide can increase intracranial pressure, while a low level is associated with poor brain circulation.

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‘Measuring the carbon dioxide level through an artery is still the most precise diagnostic for pediatric brain trauma.’
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The Harborview Injury Prevention and Research Center (HIPRC) developed a protocol for a standardized response to these events. The guidelines, released earlier this year, are used at Harborview Medical Center, the region's Level I pediatric trauma center where about 120 pediatric brain-trauma patients receive care each year.

But there are no guidelines on whether a noninvasive method of measuring carbon dioxide from patients' exhalations, known as end-tidal capnography, is as effective as drawing blood through a child's artery.

In a study, HIPRC researchers answered that clinical question: Measuring the carbon dioxide level through an artery is still the most accurate diagnostic for pediatric brain trauma.

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"To maintain appropriate carbon dioxide levels, we still need to use the gold-standard approach," said Dr. Jen-Ting Yang, a fellow physician in anesthesiology and pain medicine at the University of Washington School of Medicine.

Sampling carbon dioxide through the artery is considered the gold standard, but end-tidal carbon dioxide is widely used in clinical practice because placing an arterial line in a child is challenging, and complications are not uncommon.

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In a study of the two ways to detect carbon dioxide, Yang and colleagues found low agreement between using an arterial line and end-tidal capnography. The researchers analyzed the cases of 137 children under age 18 who were admitted to Harborview's Pediatric Intensive Care Unit between 2011 and 2017. Among these children, researchers had 445 paired data points from both diagnostic methods.

Overall, just 42 percent of paired data agreed (187 data points out of 445). The agreement was even lower during the first eight hours after admission and with development of pediatric acute respiratory distress syndrome.

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Monica Vavilala, HIPRC director and a UW professor of anesthesiology and pain medicine, said given how commonly clinicians use end-tidal derived carbon dioxide levels to adjust ventilation parameters, researchers were hoping that end-tidal capnography would be just as effective. But, she said, she is glad they were able to identify the preferred method.

"We've been able to use the evidence from patients with brain trauma to provide a better roadmap for what is agreed-upon as good quality care," she said.

Source-Eurekalert