title: Electron-beam computed tomography in the assessment of coronary artery disease after heart transplantation.
abstract: BACKGROUND
  Our aim was to compare the electron-beam CT (EBCT) features of coronary arteries in heart transplant recipients with those of biplane coronary angiography and intracoronary ultrasound (ICUS).
  
  
  RESULTS
  We examined 112 heart transplant recipients (25 female; age, 17 to 69 years; median, 52 years) 1 to 153 months (median, 46 months) after surgery by EBCT to detect coronary artery calcifications. Calcifications were quantified by the Agatston scoring system. EBCT scores were compared with coronary angiography in all patients and ICUS of the left anterior descending coronary artery (LAD) in 100 patients. Coronary artery calcifications were found in 84 patients (75%). Angiographically, 16 patients displayed >50% coronary artery stenoses, all of whom had some degree of coronary artery calcification and only 1 of whom had a score of <55 (P<0.0001). With this threshold, EBCT had a sensitivity of 94%, a specificity of 79%, a positive predictive value of 43%, and a negative predictive value of 99% for detecting stenosis. ICUS confirmed the presence of calcified plaques in all patients with an LAD score >9. EBCT total calcium score was associated with the degree of intimal proliferation in that patients without ICUS features of allograft vasculopathy had a median score of 0 (25th percentile, 0; 75th percentile, 0), whereas patients with Stanford class IV vasculopathy had a median score of 41 (9 to 98, P<0.0001).
  
  
  CONCLUSIONS
  EBCT is a promising noninvasive test for the detection of coronary heart disease in cardiac transplant recipients.
authors.affiliation: Department of Radiology, Charité, Virchow Hospital Campus, Humboldt University of Berlin, Berlin, Germany. friedrich.knollmann@rz.hu-berlin.de
authors.forename: F D
authors.initials: FD
authors.lastname: Knollmann
authors.forename: W
authors.initials: W
authors.lastname: Bocksch
authors.forename: S
authors.initials: S
authors.lastname: Spiegelsberger
authors.forename: R
authors.initials: R
authors.lastname: Hetzer
authors.forename: R
authors.initials: R
authors.lastname: Felix
authors.forename: M
authors.initials: M
authors.lastname: Hummel
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D017023:Coronary Angiography; D003327:Coronary Disease / Q000000981:diagnostic imaging*; D005260:Female; D016027:Heart Transplantation; D006801:Humans; D008297:Male; D008875:Middle Aged; D011184:Postoperative Period; D011446:Prospective Studies; D016037:Single-Blind Method; D014057:Tomography, X-Ray Computed; D018084:Ultrasonography, Interventional