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<<   作成日時 : 2012/10/11 23:00   >>

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小児の腹痛に対しての救急CT検査が急増/米国医療事情
 小児の救急受診の6.0%が腹痛であるが、CTスキャン検査が1998年に0.9%であったのが2008年には15.4%に増加した。超音波や単純Xpは変わりない。年齢が高い男子の割合が高く、白人に比べ黒人は半分の検査率である。2006年〜2008年は変化していない。


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Study finds "dramatic" rise in kids' CT scans
http://www.reuters.com/article/2012/10/08/us-study-ct-scans-idUSBRE89703820121008

By Frederik Joelving
NEW YORK | Mon Oct 8, 2012 12:19am EDT
(Reuters Health) - Emergency rooms across the U.S. have seen a steep increase in CT scans of kids presenting with belly ache, while the appendicitis rate hasn't budged, new research shows.

The x-ray-based scans offer doctors a high-resolution peek into the body, but their growing popularity has been trailed by concerns over cancer risks down the road.

The new findings, out Monday in the journal Pediatrics, show CT scans in children with abdominal pain rose from less than one percent to more than 15 percent between 1998 and 2008.

"That is basically saying for every six or seven kids that go to the ER for belly ache, one is going to get a CT scan," Dr. Jahan Fahimi, who led the new work, told Reuters Health.

"There have been a lot of studies showing we use CT scans a lot more," he said, "but it's unclear whether we are actually making a significant impact on the care we provide."

It's estimated that getting two or three scans - variously known as CT, CAT or computed tomography scans - can damage cells enough to raise a person's cancer risk, particularly in children. But the extra risk is still very small from an individual's perspective.

"I tell my patients that the CAT scan I do today has a chance of causing cancer at some point down the road," said Fahimi, an emergency physician at the University of California, San Francisco. "That risk may be one in 500, it may be one in 1,000, but it's not zero."

CT scans typically cost between a few and several hundred dollars.

Based on a large national database, Fahimi and his colleagues found the number of children showing up with belly ache at ERs held steady at around six percent; the rate of diagnosed appendicitis - the major concern in such cases - fluctuated between two and eight percent without a clear pattern.

The use of other kinds of medical imaging, such as traditional x-rays and ultrasound, also didn't change.

"The only thing that has changed is CAT scans have gone up," said Fahimi, also of Highland Hospital in Oakland, California. "There is probably some benefit to it, but I don't know if that benefit tracks with the risk."

Dr. Brigitte Baumann, an emergency physician at Cooper University Hospital in Camden, New Jersey, said she was not surprised by the findings.

"The rate of CTs that we are doing at this point is clearly very high and it is concerning," said Baumann, who was not involved in the new work. "It sort of is a one-stop-shopping imaging modality."

Whether or not it makes sense to use CT imaging depends on the specific case, Baumann and Fahimi agreed.

Both said ultrasound, which doesn't carry cancer risks, is often the better alternative. But it, too, has its limitations, such as being operator-dependent and often not available around the clock.

The study also showed black children and uninsured were less likely to get a CT scan for belly aches. That's concerning, said Fahimi, but "you can't really say if it's a good thing or a bad thing," given the unclear risk-benefit balance of the technology.

Fahimi said the scan's popularity could have something to do with doctors trying to guard themselves against malpractice lawsuits.

"A missed appendicitis is one of the top three reasons why emergency physicians will get sued," he told Reuters Health.

Baumann added that doctors might also be less inclined to do surgery today if they aren't certain it's appendicitis.

So what should parents do with all that uncertainty about risks and benefits? Fahimi said that before doing a CT scan, he often suggests waiting four to eight hours to see if the child gets better on its own, unless it looks really sick.

"I think it's fairly safe to wait if the pain is not so severe," he said.

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Computed Tomography Use Among Children Presenting to Emergency Departments With Abdominal Pain
Jahan Fahimi, Andrew Herring, Aaron Harries, Ralph Gonzales, and Harrison Alter
Pediatrics peds.2012-0739; published ahead of print October 8, 2012, doi:10.1542/peds.2012-0739

ABSTRACT

OBJECTIVE: To evaluate trends in and factors associated with computed tomography (CT) use among children presenting to the emergency department (ED) with abdominal pain.

METHODS: This study was a cross-sectional, secondary analysis of the National Hospital Ambulatory Medical Care Survey data from 1998 to 2008. We identified ED patients aged <19 years with abdominal pain and collected patient demographic and hospital characteristics, and outcomes related to imaging, hospital admission, and diagnosis of appendicitis. Trend analysis was performed over the study period for the outcomes of interest, and a multivariate regression model was used to identify factors associated with CT use.

RESULTS: Of all pediatric ED visits, 6.0% were for abdominal pain. We noted a rise in the proportion of these patients with CT use, from 0.9% in 1998 to 15.4% in 2008 (P < .001), with no change in ultrasound/radiograph use, diagnosis of appendicitis, or hospital admission. Older and male patients were more likely to have a CT scan, whereas black children were one-half as likely to undergo a CT scan compared with white children (odds ratio: 0.50 [95% confidence interval: 0.31?0.81]). Admitted children had much higher odds of undergoing a CT scan (odds ratio: 4.11 [95% confidence interval: 2.66?6.35]). There was a plateau in CT use in 2006 to 2008.

CONCLUSIONS: There was a dramatic increase in the utilization of CT imaging in the ED evaluation of pediatric patients with abdominal pain. Some groups of children may have a differential likelihood of receiving CT scans.

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