title: Left ventricular ejection fraction assessment by Tl-201 gated SPECT: a comparison with echocardiography.
abstract: BACKGROUND
  Few studies including only a limited number of patients have compared left ventricular ejection fraction (LVEF) assessed by 2-dimensional echocardiography (2-DE) and electrocardiography-gated Tl-201 single-photon emission computed tomography (SPECT).
  
  
  OBJECTIVE
  LVEF assessment by Tl-201 gated spect is comparable with LVEF assessed by 2-DE in two different echocardiographic laboratories.
  
  
  METHODS
  Patients (n = 402) underwent Tl-201 gated SPECT in the same laboratory and 2-DE in 2 different laboratories. Patients were divided into 2 groups according to the study laboratory: group 1, at the tertiary hospital and group 2, at a community laboratory.
  
  
  RESULTS
  LVEF evaluations were similar (mean LVEF: 50.73% +/- 11.67% by 2-DE vs 50.11% +/- 11.41% by SPECT in group 1 and 57.27% +/- 7.44% by 2-DE vs 57.41% +/- 8.37% by SPECT in group 2). All LVEF measurements were highly correlated (r = 0.7, P<.001). Baseline characteristics differed between the groups, with a higher prevalence of past myocardial infarction in the in-hospital vs the community echo group (46.7% vs 22.2%, P<.01), resulting in a higher LVEF in the latter, both by 2-DE (mean 50.7% +/- 11.7% vs 57.3% +/- 7.4%, P<.01) and SPECT (50.1% +/- 11.4% vs 57.4% +/- 8.4%, P<.01).
  
  
  CONCLUSIONS
  The Tl-201 gated SPECT is a reliable clinical tool for LVEF assessment, with good correlation when compared to 2-DE. It may be routinely used as an alternative for patients with poor acoustic visualization and should be performed systematically in patients undergoing myocardial perfusion imaging with Tl-201.
authors.affiliation: The Heart Institute, E. Wolfson Medical Center, Holon, Israel. dharecho@netvision.net.il
authors.forename: David
authors.initials: D
authors.lastname: Harpaz
authors.forename: Arik
authors.initials: A
authors.lastname: Asman
authors.forename: Rafael
authors.initials: R
authors.lastname: Kuperstein
authors.forename: Mona
authors.initials: M
authors.lastname: Boaz
authors.forename: Pierre
authors.initials: P
authors.lastname: Chouraqui
mesh_terms: D055426:Cardiac-Gated Single-Photon Emission Computer-Assisted Tomography / Q000295:instrumentation*; D004452:Echocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D055414:Myocardial Perfusion Imaging / Q000295:instrumentation*; D012189:Retrospective Studies; D012307:Risk Factors; D013223:Statistics as Topic; D013318:Stroke Volume; D018608:Ultrasonography, Doppler; D018487:Ventricular Dysfunction, Left / Q000000981:diagnostic imaging*; D016277:Ventricular Function, Left