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10:20 a.fi.

CfA of the Thoracic AortaHowm'd B. Chrisman, MD

Evanston Northwestern HospitalEvanston, IL

10:40 a.fi.

Cardiac and Coronary CfAChristopher Meyer, MD

Indiana University Hospital

Indianapolis, IN

11:00 a.fi.

Pu1monary CfAjoel Fishman, MD, P!JD

University OJMiami School OJMedicineMiami, FL

ObjectivesAs a result of attending the session, the attendee will beable to:l. List the relative sensitivities of VIQ scanning, helica!

er, and pulmonary angiography in detecting puJmo­nary embolism (PE).

2. Describe an appropriate er technique in evaluatingfor PE.

3. List six causes of a false-positive er scan or false­negative er scan for PE.

4. Outline an algorithm for incorporating er into theworku p of PE.

5. List three non-pulmonary embolism applications ofpulmonary CTA.Ten years after its first description, the use of CT to

evaluate for pulmonary embolism (PE) continues to gen­erate both enthusiasm and controversy. There is tremen­dous appeal to an imaging modality that permits actualvisualization of an embolus, unlike the more traditionalimaging techniques for PE. Publications and abstractshave evaluated several thousand patients by CT, findingin general that CT is very promising for evaluating seg­mental and larger PE (l-8). Despite this work, there isno current consensus on the overall accuracy of CT,

which impacts the question of cost-effectiveness (9,10).Questions remain concerning many other aspects of CTevaluation for PE, from appropriate patient selection tothe clinical significance of a negative CT examination.This abstract summarizes current thinking on these top­ics and considers an aJgorithm for incorporation of com-