title: Defining laterality of the descending thoracic aorta in a 4-chamber view of the heart.
abstract: OBJECTIVE
  Right descending aortas have been correlated with an increased risk of congenital heart disease. Nevertheless, the aortic position remains a largely overlooked diagnostic tool in second-trimester sonography because no formal system for assessing the position exists. By developing a method of assigning the position of the aorta relative to the thoracic midline, diagnostic use of the descending aorta's position might be implemented more easily.
  
  
  METHODS
  The method of assessing the position relative to the midline was tested by comparing the analysis of 2 independent observers, who showed a 94.4% concordance rate.
  
  
  RESULTS
  Comparison of the percentages of aortic positions between the gestational ages (GAs) of 18 and 21 weeks showed no significant correlation between the aortic position and GA.
  
  
  CONCLUSIONS
  We suggest simply paying attention to the aortic position in an already standard view. The extra effort is minimal, and it has the potential to improve the diagnostic accuracy of the 4-chamber view.
authors: TheFetus.net, Nashville, TN, USA.
authors: Deema
authors: D
authors: Ismail
authors: Eva
authors: E
authors: Leinart
authors: Philippe
authors: P
authors: Jeanty
authors: Clay
authors: C
authors: Brown
authors: Cheryl
authors: C
authors: Turner
mesh_terms: D001013:Aorta, Thoracic / Q000000981:diagnostic imaging* / Q000196:embryology*; D016009:Chi-Square Distribution; D005260:Female; D005318:Fetal Heart / Q000000981:diagnostic imaging* / Q000196:embryology*; D005865:Gestational Age; D006330:Heart Defects, Congenital / Q000000981:diagnostic imaging*; D006801:Humans; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D012189:Retrospective Studies; D016216:Ultrasonography, Prenatal / Q000379:methods*