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Original Article
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Volume 354:2317-2327 June 1, 2006 Number 22
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Multidetector Computed Tomography for Acute Pulmonary Embolism
Paul D. Stein, M.D., Sarah E. Fowler, Ph.D., Lawrence R. Goodman, M.D., Alexander Gottschalk, M.D., Charles A. Hales, M.D., Russell D. Hull, M.B., B.S., M.Sc., Kenneth V. Leeper, Jr., M.D., John Popovich, Jr., M.D., Deborah A. Quinn, M.D., Thomas A. Sos, M.D., H. Dirk Sostman, M.D., Victor F. Tapson, M.D., Thomas W. Wakefield, M.D., John G. Weg, M.D., Pamela K. Woodard, M.D., for the PIOPED II Investigators

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ABSTRACT

Background The accuracy of multidetector computed tomographic angiography (CTA) for the diagnosis of acute pulmonary embolism has not been determined conclusively.

Methods The Prospective Investigation of Pulmonary Embolism Diagnosis II trial was a prospective, multicenter investigation of the accuracy of multidetector CTA alone and combined with venous-phase imaging (CTA–CTV) for the diagnosis of acute pulmonary embolism. We used a composite reference test to confirm or rule out the diagnosis of pulmonary embolism.

Results Among 824 patients with a reference diagnosis and a completed CT study, CTA was inconclusive in 51 because of poor image quality. Excluding such inconclusive studies, the sensitivity of CTA was 83 percent and the specificity was 96 percent. Positive predictive values were 96 percent with a concordantly high or low probability on clinical assessment, 92 percent with an intermediate probability on clinical assessment, and nondiagnostic if clinical probability was discordant. CTA–CTV was inconclusive in 87 of 824 patients because the image quality of either CTA or CTV was poor. The sensitivity of CTA–CTV for pulmonary embolism was 90 percent, and specificity was 95 percent. CTA–CTV was also nondiagnostic with a discordant clinical probability.

Conclusions In patients with suspected pulmonary embolism, multidetector CTA–CTV has a higher diagnostic sensitivity than does CTA alone, with similar specificity. The predictive value of either CTA or CTA–CTV is high with a concordant clinical assessment, but additional testing is necessary when the clinical probability is inconsistent with the imaging results.


Source Information

From the Department of Research, St. Joseph Mercy Oakland Hospital, Pontiac, Mich., and the Department of Medicine, Wayne State University, Detroit (P.D.S.); the Biostatistics Center, Department of Epidemiology and Biostatistics, George Washington University, Rockville, Md. (S.E.F.); the Department of Radiology, Medical College of Wisconsin, Milwaukee (L.R.G.); the Department of Radiology, Michigan State University, East Lansing (A.G.); the Department of Medicine, Massachusetts General Hospital, and Harvard Medical School — both in Boston (C.A.H., D.A.Q.); the Department of Medicine, University of Calgary, Calgary, Alta., Canada (R.D.H.); the Department of Medicine, Emory University, Atlanta (K.V.L.); the Department of Medicine, Henry Ford Hospital, Detroit (J.P.); the Department of Radiology, Weill Cornell Medical College, New York (T.A.S.); Weill Cornell Medical College and Methodist Hospital, Houston (H.D.S.); the Department of Medicine, Duke University, Durham, N.C. (V.F.T.); the Departments of Surgery (T.W.W.) and Medicine (J.G.W.), University of Michigan, Ann Arbor; and the Department of Radiology, Washington University, St. Louis (P.K.W.).

Address reprint requests to Dr. Stein at St. Joseph Mercy Oakland Hospital, 44405 Woodward Ave., Pontiac, MI 48341, or at steinp{at}trinity-health.org.

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Related Letters:

Computed Tomography for Pulmonary Embolism
Altschuler E. L., Brotman D. J., Stein P. D., Goodman L. R., Sostman H. D.
Extract | Full Text | PDF  
N Engl J Med 2006; 355:955-956, Aug 31, 2006. Correspondence

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