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Simple change results in fewer unnecessary imaging exams for patients

OAK BROOK, Ill. A new rule preventing medical support staff from completing orders for outpatient imaging exams that were likely to be negative resulted in a marked decrease in low-yield exams for patients, according to a study appearing in the June issue of Radiology.

Many medical institutions request and schedule outpatient diagnostic imaging exams through use of web-based radiology order entry systems. Some systems offer real-time feedback, called decision support, on the appropriateness of the exams being ordered. When entering the desired examination into the system, the physician or support staff must also enter clinical information justifying the order. Based on that information, the decision-support system provides a yield score ranging from one to nine. The score indicates the likelihood that the selected exam will yield valuable diagnostic or positive results for this set of clinical circumstances.

Following American College of Radiology appropriateness criteria, a score of one to three is considered low yield. The user is then given the opportunity to cancel the order or select a different examination. However, because medical support staff do not make clinical decisions, they are less likely to cancel or revise an order without additional clarification from the physician.

To address this problem, Massachusetts General Hospital instituted a rule preventing medical support staff from completing computerized orders for outpatient CT, MRI and nuclear medicine examinations that received low-yield decision support scores.

"We developed this strategy to encourage more clinician 'hands-on' use of the system," said Vartan M. Vartanians, M.D., clinical research associate in the Department of Radiology at Massachusetts General Hospital in Boston. "With greater physician involvement, fewer low-yield exams are ordered."

After the change, the proportion of total examination requests by physicians directly logging into the system more than doubled from 26 percent to 54 percent of the total number of requests, while the percentage of low-yield exams requested decreased from 5.4 percent of total number of requests to 1.9 percent of total requests.

"Physicians need to use the decision support system for it to be effective, but getting them to do so can be difficult," Dr. Vartanians said. "Our work demonstrates that a minimally disruptive alteration in the radiology order entry system can encourage direct physician involvement, and improve patient care by reducing the number of low-yield examinations."


Contact: Linda Brooks
Radiological Society of North America

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