Background Single-detectorrow computed tomography (CT)has a low sensitivity for pulmonary embolism and must be combinedwith venous-compression ultrasonography of the lower limbs.We evaluated whether the use of D-dimer measurement and multidetector-rowCT, without lower-limb ultrasonography, might safely rule outpulmonary embolism.
Methods We included 756 consecutive patients with clinicallysuspected pulmonary embolism from the emergency departmentsof three teaching hospitals and managed their cases accordingto a standardized sequential diagnostic strategy. All patientswere followed for three months.
Results Pulmonary embolism was detected in 194 of the 756 patients(26 percent). Among the 82 patients with a high clinical probabilityof pulmonary embolism, multidetector-row CT showed pulmonaryembolism in 78, and 1 patient had proximal deep venous thrombosisand a CT scan that was negative for pulmonary embolism. Of the674 patients without a high probability of pulmonary embolism,232 (34 percent) had a negative D-dimer assay and an uneventfulfollow-up; CT showed pulmonary embolism in 109 patients. CTand ultrasonography were negative in 318 patients, of whom 3had a definite thromboembolic event and 2 died of possible pulmonaryembolism during follow-up (three-month risk of thromboembolism,1.7 percent; 95 percent confidence interval, 0.7 to 3.9). Twopatients had proximal deep venous thrombosis and a negativeCT scan (risk, 0.6 percent; 95 percent confidence interval,0.2 to 2.2). The overall three-month risk of thromboembolismin patients without pulmonary embolism would have been 1.5 percent(95 percent confidence interval, 0.8 to 3.0) if the D-dimerassay and multidetector-row CT had been the only tests usedto rule out pulmonary embolism and ultrasonography had not beenperformed.
Conclusions Our data indicate the potential clinical use ofa diagnostic strategy for ruling out pulmonary embolism on thebasis of D-dimer testing and multidetector-row CT without lower-limbultrasonography. A larger outcome study is needed before thisapproach can be adopted.
Source Information
From the Service of General Internal Medicine (A.P.) and the Division of Angiology and Hemostasis (G.L.G., H.B.), Department of Internal Medicine, and the Service of Radiodiagnosis and Interventional Radiology, Department of Medical Radiology and Informatics (N.H.), Geneva Faculty of Medicine and Geneva University Hospital, Geneva; the Emergency Department (P.-M.R.), the Service of Radiology (A.-L.G.), and the Service of Cardiology (A.F.), Angers University Hospital, Angers, France; and the Service of Pneumology (O.S., G.M.), the Service of Radiology (M.-P.R.), and the Emergency Department (A.D.), Hôpital Européen Georges-Pompidou, Paris.
Address reprint requests to Dr. Perrier at the Service of General Internal Medicine, Geneva University Hospital, Rue Micheli-du-Crest 24, CH-1211 Geneva 14, Switzerland, or at arnaud.perrier{at}medecine.unige.ch.
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