title: Left ventricular ejection fraction: real-world comparison between cardiac computed tomography and echocardiography in a large population.
abstract: OBJECTIVE
  This study compared cardiac computed tomography (CT) and two-dimensional transthoracic echocardiography (ECC) for assessing left ventricular ejection fraction (LVEF) using real-world data from a large patient population.
  
  
  METHODS
  We studied 450 patients (284 males; mean age 64±12 years; range 12-88) who underwent CT and ECC due to suspected coronary artery disease. For CT, we used multiphase short-axis reconstructions and evaluated them with a dedicated software tool that uses Simpson's rule to compute LV volumes. For ECC, computation was based on the biplane Simpson's method. Results in terms of EF were compared with the paired Student's t test, Pearson's correlation coefficient (r), and Bland-Altman analysis.
  
  
  RESULTS
  EF was 52%±15% for CT and 55%±13% for ECC. Statistically significant differences, albeit with good correlation, were observed between the measurements (r=0.71; p<0.05). ECC showed a slight tendency to overestimate EF. When the population was divided into subgroups according to EF, this was underestimated by ECC in the subgroup with EF >50% and overestimated in those with EF 35%-50% and <35%, with consistently significant differences between ECC and CT (p<0.05) and progressively lower levels of agreement.
  
  
  CONCLUSIONS
  In the real-world assessment of EF, ECC provides significantly different data from CT, with a bias that increases proportionally to LV systolic dysfunction.
authors.affiliation: Dipartimento di Radiologia e Cardiologia, Azienda Ospedaliero-Universitaria di Parma, Via Gramsci 14, 43100 Parma, Italy.
authors.forename: E
authors.initials: E
authors.lastname: Maffei
authors.forename: G
authors.initials: G
authors.lastname: Messalli
authors.forename: A
authors.initials: A
authors.lastname: Palumbo
authors.forename: C
authors.initials: C
authors.lastname: Martini
authors.forename: S
authors.initials: S
authors.lastname: Seitun
authors.forename: A
authors.initials: A
authors.lastname: Aldrovandi
authors.forename: A
authors.initials: A
authors.lastname: Cuttone
authors.forename: E
authors.initials: E
authors.lastname: Emiliano
authors.forename: R
authors.initials: R
authors.lastname: Malagò
authors.forename: A
authors.initials: A
authors.lastname: Weustink
authors.forename: N
authors.initials: N
authors.lastname: Mollet
authors.forename: F
authors.initials: F
authors.lastname: Cademartiri
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D003324:Coronary Artery Disease / Q000000981:diagnostic imaging / Q000503:physiopathology; D004452:Echocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013318:Stroke Volume; D014057:Tomography, X-Ray Computed; D016277:Ventricular Function, Left; D055815:Young Adult