title: Clinical contributions of 64-slice computed tomography in the evaluation of cardiomyopathy of unknown origin.
abstract: BACKGROUND
  Meta-analyses have confirmed the high performance of multislice computed tomography (MSCT) in coronary stenosis detection. Recent reports have described the study of left ventricular anatomy and function and coronary venous anatomy with MSCT.
  
  
  OBJECTIVE
  We sought to compare, in patients with cardiomyopathy of unknown origin, the performance of MSCT versus angiography for significant coronary artery disease detection and versus transthoracic echocardiography (TTE) for left ventricular anatomy and function evaluation, and to assess its ability to characterize coronary venous anatomy.
  
  
  METHODS
  Fifty-nine patients with cardiomyopathy (left ventricular ejection fraction [LVEF] less than or equal to 40%) of unknown origin, in sinus rhythm, underwent MSCT, TTE and coronary angiography.
  
  
  RESULTS
  Twenty-four (3%) of 724 analysable coronary segments (97%) and 12 (20%) patients had significant coronary artery disease. MSCT sensitivity, specificity, and positive and negative predictive values for coronary artery disease detection were 87.5%, 98.5%, 67.7% and 99.6% in the per-segment assessment and 100%, 91%, 75% and 100% in the per-patient evaluation, respectively. Statistical analyses showed good agreement between MSCT and TTE in LVEF measurement (33+/-10% vs 32+/-11%, p=0.4, mean difference=0.7%, limits of agreement+/-13.6%) and a small LVED diameter overestimation (65.0+/-9.3mm vs 63.6+/-9.4mm, p=0.03). MSCT allowed detection of the posterolateral vein in 86% of cases.
  
  
  CONCLUSIONS
  In selected patients presenting with idiopathic cardiomyopathy, MSCT is accurate for coronary artery disease detection and is a useful coronary venous imaging tool. MSCT studies of left ventricular function and morphology were mostly concordant with TTE measurements.
authors.affiliation: Service de cardiologie et maladies vasculaires, CCP-CHU de Pontchaillou, 2, rue Le-Guilloux, 35033 Rennes cedex 9, France. dominique.boulmier@chu-rennes.fr
authors.forename: Dominique
authors.initials: D
authors.lastname: Boulmier
authors.forename: Caroline
authors.initials: C
authors.lastname: Audinet
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Heautot
authors.forename: Antoine
authors.initials: A
authors.lastname: Larralde
authors.forename: David
authors.initials: D
authors.lastname: Veillard
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Hamonic
authors.forename: Marc
authors.initials: M
authors.lastname: Bedossa
authors.forename: Guillaume
authors.initials: G
authors.lastname: Leurent
authors.forename: Mireille
authors.initials: M
authors.lastname: Garreau
authors.forename: Hervé
authors.initials: H
authors.lastname: Le Breton
mesh_terms: D000328:Adult; D000368:Aged; D009202:Cardiomyopathies / Q000000981:diagnostic imaging* / Q000209:etiology / Q000503:physiopathology; D017023:Coronary Angiography; D054326:Coronary Sinus / Q000000981:diagnostic imaging*; D023921:Coronary Stenosis / Q000150:complications / Q000000981:diagnostic imaging* / Q000503:physiopathology; D004452:Echocardiography; D005260:Female; D006352:Heart Ventricles / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D013318:Stroke Volume; D014057:Tomography, X-Ray Computed; D018487:Ventricular Dysfunction, Left / Q000000981:diagnostic imaging* / Q000209:etiology / Q000503:physiopathology; D016277:Ventricular Function, Left; D055815:Young Adult