Diagnostic imaging in line with other hospital costs

OAK BROOK, Ill. Dramatic increases in the utilization of high-technology imaging studies have raised the argument that diagnostic imaging has replaced prescription drugs as the driver of healthcare costs. However, a study in the June issue of the journal Radiology shows that imaging cost increases have remained in line with other hospital costs and that diagnostic imaging may be associated with shorter hospital stays.

The study was based on a review of hospital costs for 17,139 patients admitted to Massachusetts General Hospital (MGH) in Boston between 1996 and 2002. Although the number of diagnostic imaging procedures for this group more than doubled--particularly in computed tomography (CT) and magnetic resonance (MR)--imaging cost as a percentage of total costs remained approximately the same.

"It's hard to say that diagnostic imaging is driving hospital costs when imaging costs have increased at approximately the same rate as other expenses in healthcare," said study author G. Scott Gazelle, M.D., M.P.H., Ph.D., director of the MGH Institute for Technology Assessment and associate professor of radiology at Harvard Medical School.

The data also associated an additional $100 spent on imaging with a decreased length of stay by 0.26 of a day, meaning an additional $385 spent on imaging by this sample group was associated with one less day in the hospital.

"Those patients who had more imaging had less of a hospital stay," Dr. Gazelle said. "As doctors, we like to think that imaging leads to quicker diagnosis and treatment. Our results were encouraging and suggested that more spending on imaging does appear to be associated with a shorter hospital stay."

For the study, six groups related by diagnoses--stroke, appendectomy, lung cancer, colon cancer, back problems and upper gastrointestinal--were selected from MGH's accounting records and analyzed. The total cost of inpatient imaging for this sample was 51 percent high

Contact: Doug Dusik
Radiological Society of North America

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