Is an X-Ray Safe for an Infant?

It’s the most common reason a child under 1 may end up at the hospital: bronchiolitis. The illness tends to peak in the winter months. Symptoms start out similar to the common cold but then progress to coughing, wheezing and sometimes even difficulty breathing, according to the Mayo Clinic. Complications of severe bronchiolitis can range from a lack of oxygen that turn a child’s lips or skin blue — called cyanosis — to dehydration and respiratory failure.

Not surprisingly, parents and clinicians would want to do everything they can to ensure a baby is well cared for and kept safe. Fortunately, in most cases kids don’t experience such serious complications. What’s more, doctors are usually able to make a diagnosis by examining the young patient and using a stethoscope to listen to the child’s lungs.

Despite this, and concerted efforts like the Choosing Wisely initiative focused on fostering a dialogue about avoiding unnecessary tests, treatments and procedures, data indicates many children under 2 years of age with bronchiolitis routinely get chest X-rays, when in fact radiography isn’t typically needed. “Unnecessary imaging for bronchiolitis contributes to health care costs, radiation exposure, and antibiotic overuse and consequently was identified in 2013 as a national ‘Choosing Wisely’ priority,” notes a research letter published in the Journal of the American Medical Association in October.

[See: The 11 Most Dangerous Places in Your Home for Babies and Small Kids.]

Yet the study found that the rate of X-rays for children under 2 with bronchiolitis who were admitted to hospital emergency departments in the U.S. didn’t decrease between 2007 and 2015. The data indicates nearly half — or a mean of 46 percent — received X-rays.

“It appears that there has not really been much progress, in terms of reducing radiography for the diagnosis of bronchiolitis,” says Dr. Brett Burstein, a pediatric emergency medicine physician at Montreal Children’s Hospital who led the research that relied on data from the Centers for Disease Control and Prevention. X-rays were most frequently done on bronchiolitis patients at non-pediatric hospitals, where the majority of young patients are seen.

In addition to radiation exposure, Burstein points out there’s a high association between receiving a chest X-ray for bronchiolitis and antibiotic prescribing, which is inappropriate for bronchiolitis. Reducing inappropriate antibiotic prescription is a top priority of the American Academy of Pediatrics. “Study limitations include a lack of clinical data to determine the appropriateness of radiographic imaging, which may differ depending on physician experience,” the researchers note. “However, AAP guidelines recommend imaging only in severe cases that warrant intensive care or suggest the possibility of airway complication, which is unlikely for ED-discharged patients.” According to AAP clinical practice guidelines, “Initial radiography should be reserved for cases in which respiratory effort is severe enough to warrant ICU admission or where signs of an airway complication (such as pneumothorax) are present.” Burstein explains that pneumothorax is like an air leak or lung puncture within the chest.

Premature infants and those in the first couple months of life who develop bronchiolitis can sometimes experience “pauses in breathing,” or what’s called apnea, according to Mayo Clinic.

“For bronchiolitis specifically, the recommendation is in uncomplicated cases you don’t really need a chest X-ray because it doesn’t really affect treatment,” explains Dr. Richard Southard, a pediatric radiologist and director of CT and cardiac imaging for the radiology department at Phoenix Children’s Hospital. Still in a minority of cases that are more complex, an X-ray may be helpful. “If the child’s like less than a month old, has a high fever, a white (blood cell) count elevation, severe distress, then those are the ones that you want to basically (determine) is there pneumonia on top of it that would benefit from antibiotics versus not,” Southard says.

[See: What Parents Need to Know About Enterovirus.]

Experts say it’s important for parents and clinicians to discuss the need for X-rays or other tests and how going through with those might help with diagnosis or influence treatment, before proceeding. “You don’t want to do a test unnecessarily,” Southard says. Still, he and other clinicians say that must be balanced against doing what’s necessary to make a proper diagnosis.

What’s more, experts say that even when the evidence supports not doing a test or imaging, there’s often an expectation that doctors should do more rather than less. “There’s no question that physicians face a pressure, in part established by habit, medical culture, parental expectations — all of which contributes,” Burstein says.

As with X-rays for bronchiolitis patients, Burstein found the use of CT scans — which use higher levels of radiation — to evaluate children with head injuries hasn’t decreased either. “Excess CT use contributes to rising health care costs, exposes many children to the harmful effects of ionizing radiation and for some, the additional risks of sedation required for imaging,” he and fellow researchers wrote in the recent study published in Pediatrics. “With a long-standing recognition of the lifetime fatal malignancy risk that is associated with CT imaging, considerable efforts have been made, championing the ‘as low as reasonably achievable’ principle and a reduction of unnecessary CT scans.”

Along with considering ways to make a diagnosis that don’t involve imaging, when possible, health providers use lower-dose radiation on kids. Phoenix Children’s, for example, supports the Image Gently campaign, which involves taking a pledge to use the lowest effective dose of radiation on children that will still yield images that can be used to make a diagnosis. “It’s pointless to use really low dose techniques (where) the images are so grainy that you can’t diagnose anything,” Southard says. “So you can only go so far.”

Although difficult to quantify and variable based on everything from radiation dose to the patient’s age when scanned, Southard says the lifetime risk of developing cancer due to radiation exposure from imaging is very low. But it’s key parents and doctors discuss the need for imaging, experts say, and that there’s a focus on using the lowest dose of radiation that’s effective, especially for kids who need to undergo many scans.

[See: 9 Sports Injuries That Sideline Kids.]

The younger children are, the more sensitive they are to radiation, Burstein says. A head CT done on a 1-year-old produces, approximately, an excess (or additional) 1 in 2,570 lifetime risk of developing a fatal cancer. By way of comparison, he notes, the estimated lifetime risk of dying in a motor vehicle accident is about 1 in 100, and the estimated lifetime risk of drowning is about 1 in 1,000. There’s far less radiation exposure with an X-ray. “The most important downstream consequence specifically of X-rays for bronchiolitis is the inappropriate use of antibiotics,” Burstein says. “So it’s important that parents question the need for imaging modalities whether it’s a chest X-ray or a CT scan.”

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