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Patient factors play key role in emergency department imaging
Date:6/24/2013

OAK BROOK, Ill. Despite concerns to the contrary, very little of the variation in Emergency Department (ED) imaging utilization is attributable to physician experience, training or gender, according to a new study published online in the journal Radiology.

Imaging exams like X-rays and CT scans are common in the ED. In 2010, slightly more than 47 percent of all ED visits in the United States had an imaging exam associated with them.

"Analyzing and understanding drivers of use of imaging in the ED is important for several reasons," said Christopher L. Sistrom, M.D., M.P.H., Ph.D., from the departments of radiology at Massachusetts General Hospital in Boston and the University of Florida in Gainesville, Fla. "There's a balance of cost and benefits to the patient, institution and payer, as well as the overarching issue of radiation exposure."

Previous studies have found substantial variation in imaging rates across and within EDs, suggesting different tendencies among physicians when ordering imaging. However, much of the existing research is limited, according to Dr. Sistrom.

"A lot of literature on imaging variability can lead to a false assumption that doctors are primarily responsible," he said. "The problem is that it is difficult to fully describe and quantify variability at the different levels it can occur."

In the new study, Dr. Sistrom and colleagues analyzed 88,851 ED visits during 2011 at Massachusetts General Hospital. They used an analytical tool known as hierarchical logistic regression to identify multiple predictors of the probability that imaging was ordered during a given visit.

"That's what makes our paper unique," Dr. Sistrom said. "Hierarchal modeling allows us to ask very specific questions about the relative contributions of various factors to imaging use."

The overall rate of imaging utilization in the Massachusetts General ED was 45.4 percent in 2011, similar to
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Contact: Linda Brooks
lbrooks@rsna.org
630-590-7762
Radiological Society of North America
Source:Eurekalert

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