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CT angiography may be unnecessary in patients with suspected pulmonary embolism
Date:6/14/2010

OAK BROOK, Ill. A new study suggests that computed tomography (CT) angiography might be unnecessary in many patients suspected of having pulmonary embolism (PE), based on the results of risk assessment analysis. PE risk assessment could help reduce radiation exposure and costs associated with CT angiography. The results of the study appear in the online edition and August print issue of the journal Radiology.

"Our study suggests that the frequency of ordering CT angiograms can be markedly reduced with resultant cost-savings and decreased radiation exposure," said lead author Mark D. Mamlouk, M.D., radiology resident at the University of California, Irvine in Orange, Calif.

Pulmonary embolism occurs when a blood clot, usually from the leg, travels through the bloodstream and gets lodged in a pulmonary artery. The condition can be fatal, so prompt diagnosis is critical.

CT angiography's high sensitivity and specificity has made it the preferred modality for diagnosing PE. However, the increasing use of the examination has fueled concerns over procedure costs and radiation exposure to patients, along with risks associated with the use of contrast agents.

For the study, the researchers assessed the possibility of using risk factors associated with thromboembolism, or blood clot formation, to reduce the number of CT angiograms for PE. They reviewed the electronic medical records of 2,003 patients who underwent CT angiography for possible PE between July 2004 and February 2006. Among the risk factors assessed were age, history of immobilization and cancer. Other risk factors included excess estrogen state, a history of venous thromboembolism, gender and disorders that cause blood to clot more easily than normal.

Overall, CT angiograms were negative for PE in 1,806 of 2,003 patients, or 90.2 percent. Among the 197 patients with CT angiograms positive for PE, 192, or 97.5 percent, had one or more risk factors.'/>"/>

Contact: Linda Brooks
lbrooks@rsna.org
630-590-7762
Radiological Society of North America
Source:Eurekalert

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