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Coronary Arterial Stent Patency: Assessment with Electron-Beam CT¹

¹ From the Institute of Diagnostic and Interventional Radiology, University of Witten/Herdecke, Schulstr 10, 45468 Muelheim a. d. Ruhr, Germany (H.P., C.A.S., S.S.S., A.S., R.M.M.S.); the Department of Radiology and Microtherapy, University of Witten/Herdecke, Bochum, Germany (S.M., D.H.W.G.); and the Department of Cardiology, University of Essen, Germany (S.M., R.E.). From the 1997 RSNA scientific assembly. Received July 21, 1997; revision requested October 7; final revision received April 26, 1999; accepted August 20. Address reprint requests to H.P. (e-mail: pump@mri.de).

PURPOSE: To evaluate electron-beam computed tomography (CT) for stent localization and noninvasive assessment of stent patency in patients with coronary arterial stents and coronary bypass stents.

MATERIALS AND METHODS: CT in the single-section volume mode was performed in 202 patients with 321 coronary arterial stents in 221 vessels to localize the stents. Patency was evaluated in the multisection flow mode with an intravenous bolus injection of contrast material. All electron-beam CT images were reviewed by an observer who had no knowledge of the coronary angiographic results. Electron-beam CT findings were then compared with coronary angiographic findings.

RESULTS: The stents could be visualized and related to the coronary arterial segments in 216 of 221 vessels with electron-beam CT. Of the 221 vessels, 207 were correctly evaluated with electron-beam CT. Compared with coronary angiography, electron-beam CT permitted the detection of 18 of 23 high-grade stenoses (sensitivity, 78%) and correctly depicted the absence of high-grade stenoses in 189 of 193 vessels with stents (specificity, 98%). Altogether, 18 stenoses were detected correctly at electron-beam CT; the interpretation was false-positive in four vessels (positive predictive value, 82% [18/22 vessels]) and false-negative in five (negative predictive value, 97% [189/194 vessels]).

CONCLUSION: Electron-beam CT may be helpful in localizing intracoronary stents and assessing stent patency noninvasively to delay the intervals between catheterizations in an increasing number of patients.

Index terms: Computed tomography (CT), electron beam, 548.12112, 548.12119 • Coronary angiography, 548.1244 • Coronary vessels, CT, 548.12112, 548.12119 • Coronary vessels, stenosis or obstruction, 548.76 • Coronary vessels, stents and prostheses, 548.1269

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