title: Evaluation of the left atrial appendage with real-time 3-dimensional transesophageal echocardiography: implications for catheter-based left atrial appendage closure.
abstract: BACKGROUND
  Precise knowledge of left atrial appendage (LAA) orifice size is crucial for correct sizing of LAA closure devices. The aim of the present study was to determine the performance of real-time 3D transesophageal echocardiography (RT3DTEE) for LAA orifice size assessment, compared with 2D transesophageal echocardiography (2DTEE), and to investigate the impact of atrial fibrillation (AF) on LAA orifice size.
  
  
  RESULTS
  One hundred thirty-seven patients (38 control subjects, 31 with paroxysmal AF, 38 with persistent AF and 30 with permanent AF) underwent 2DTEE and RT3DTEE. Both techniques were used to measure LAA orifice area. Clinically-indicated 64-slice computed tomography (CT) was used as reference technique in 46 patients. Two-dimensional TEE underestimated LAA orifice area, compared with RT3DTEE (1.99±0.94 cm(2) versus 3.05±1.27 cm(2); P<0.001). RT3DTEE showed higher correlation with CT for the assessment of LAA orifice area, compared with 2DTEE (r=0.92; 95% confidence interval, 0.85 to 0.95, versus r=0.72; 95% confidence interval, 0.54 to 0.83, respectively). At Bland-Altman analysis, RT3DTEE and 2DTEE underestimated LAA orifice area, compared with CT. However, RT3DTEE showed smaller bias (0.07 cm(2) versus 0.72 cm(2)) and narrower limits of agreement (-0.71 to 0.85 cm(2) versus -0.58 to 2.02 cm(2)) with CT, compared with 2DTEE. Among AF patients, a progressive increase in RT3DTEE-derived LAA orifice area was observed with increasing frequency of AF (P<0.001). At multivariate analysis, AF and left atrial volume index (P<0.001 for both) were independently associated with RT3DTEE-derived LAA orifice area.
  
  
  CONCLUSIONS
  RT3DTEE is more accurate than 2DTEE for the assessment of LAA orifice size. A progressive increase in LAA orifice area is observed with increasing frequency of AF.
authors: Division of Cardiology, Fondazione Cardiocentro Ticino, Lugano, Switzerland. gnucifora@cardionet.it
authors: Gaetano
authors: G
authors: Nucifora
authors: Francesco F
authors: FF
authors: Faletra
authors: François
authors: F
authors: Regoli
authors: Elena
authors: E
authors: Pasotti
authors: Giovanni
authors: G
authors: Pedrazzini
authors: Tiziano
authors: T
authors: Moccetti
authors: Angelo
authors: A
authors: Auricchio
mesh_terms: D000368:Aged; D020517:Atrial Appendage / Q000000981:diagnostic imaging* / Q000601:surgery; D001281:Atrial Fibrillation / Q000000981:diagnostic imaging* / Q000601:surgery; D006328:Cardiac Catheterization; D006348:Cardiac Surgical Procedures / Q000379:methods*; D019560:Echocardiography, Three-Dimensional / Q000379:methods*; D017548:Echocardiography, Transesophageal / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D011379:Prognosis; D015203:Reproducibility of Results; D014057:Tomography, X-Ray Computed