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CLINICAL RESEARCH: NON-INVASIVE CORONARY ANGIOGRAPHY

Non-Invasive Detection of Coronary Artery Disease in Patients With Left Bundle Branch Block Using 64-Slice Computed Tomography

Saïd Ghostine, MD^_*,_*, Christophe Caussin, MD^_*, Béatrice Daoud, MD, Michel Habis, MD^_*, Eric Perrier, MD, David Pesenti-Rossi, MD^_*, Anne Sigal-Cinqualbre, MD, Claude-Yves Angel, MD, Bernard Lancelin, MD^_*, André Capderou, MD, PhD and Jean-François Paul, MD

^_* Department of Cardiology, Marie Lannelongue Hospital, Le Plessis Robinson, France
Department of Radiology, Marie Lannelongue Hospital, Le Plessis Robinson, France
CNRS UMR 8162, Marie Lannelongue Hospital, Le Plessis Robinson, France
Department of Aeronautical Cardiology, HIA Percy, Clamart, France.

Manuscript received February 27, 2006; revised manuscript received April 11, 2006, accepted April 25, 2006.

^_* Reprint requests and correspondence: Dr. Saïd Ghostine, Marie Lannelongue Hospital, 133 avenue de la Resistance, 92350 Le Plessis Robinson, France. (Email: ghostine{at}ccml.com).

OBJECTIVES: The goal of this study was to evaluate the diagnostic accuracy of 64-slice computed tomography (CT) to identify coronary artery disease (CAD) in patients with complete left bundle branch block (LBBB).

BACKGROUND: Left bundle branch block increases risk of cardiac mortality, and prognosis is primarily determined by the underlying coronary disease. Non-invasive stress tests have limited performance, and conventional coronary angiography (CCA) is usually required.

METHODS: Sixty-six consecutive patients with complete LBBB and sinus rhythm admitted for CCA were enrolled. Computed tomography was performed 3 ± 3.9 days before CCA. The accuracy of 64-slice CT to detect significant stenosis (>50% lumen narrowing) was compared with quantitative coronary angiography. All segments were analyzed regardless of image quality from coronary calcification or motion artifacts. Results were analyzed by patient and by coronary segment (990) using the American Heart Association 15-segment model.

RESULTS: Lower heart rates were associated with improved image quality. Computed tomography correctly identified 35 of 37 (95%) patients without significant stenosis and 28 of 29 (97%) patients with significant stenosis on CCA. Computed tomography correctly assessed 68 of 94 (72%) significant stenosis. Overall, accuracy, sensitivity, specificity, positive predictive value, and negative predictive value of 64-slice CT for identifying CAD by patient was 95%, 97%, 95%, 93%, and 97%, respectively, and by segment was 97%, 72%, 99%, 91%, and 97%, respectively.

CONCLUSIONS: In a routine clinical practice, 64-slice CT detects with excellent accuracy a significant CAD in patients with complete LBBB. A normal CT in this clinical setting is a robust tool to act as a filter and avoid invasive diagnostic procedures.

Abbreviations and Acronyms   CAD = coronary artery disease   CCA = conventional coronary angiography   CT = computed tomography   LAD = left anterior descending coronary artery   LBBB = left bundle branch block   LCX = left circumflex artery   LVEF = left ventricular ejection fraction   MSCT = multislice computed tomography   QCA = quantitative coronary angiography   RCA = right coronary artery

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