Portal de Periódicos da CAPES

Accuracy of mitral valve area measurements using transthoracic rapid freehand 3-dimensional scanning: comparison with noninvasive and invasive methods

2003; Elsevier BV; Volume: 16; Issue: 12 Linguagem: Inglês

10.1067/j.echo.2003.07.005

1097-6795

Lissa Sugeng, Lynn Weinert, Georgeanne Lammertin, Patrick Thomas, Kirk T. Spencer, Jeanne M. DeCara, Victor Mor‐Avi, Dezheng Huo, Ted Feldman, Roberto M. Lang,

Cardiac Arrhythmias and Treatments

Objective The feasibility and accuracy of direct transthoracic 3-dimensional (3D) mitral valve area (MVA) measurements obtained using freehand scanning was investigated in patients with mitral stenosis. Methods A total of 30 patients (26 women, 4 men; aged 55 ± 13 years) underwent a 2-dimensional (2D) and Doppler study 1 hour before percutaneous balloon mitral valvuloplasty. Transthoracic freehand data were acquired using a magnetic receiver attached to a broadband transducer, gated to electrocardiography and respiration. Volumetric MVA measurements from the left ventricle and left atrium were obtained and compared with MVA measurements derived from 2D planimetry, pressure half-time, and proximal isovelocity surface area. Invasive Gorlin MVA measurements were the gold standard for comparison. Results In all, 29 patients (97%) had 3D data allowing MVA measurements. Direct 3D measurements from the left ventricle had the least bias (0.06 ± 0.19 cm2) and tightest limits of agreement (−0.44 to 0.32) compared with left atrium measurements (0.17 ± 0.25 cm2 and −0.67 to 0.33, respectively). The proximal isovelocity surface area method (bias: 0.09 ± 0.34 cm2) was the most accurate of all 2D methods followed by pressure half-time (0.17 ± 0.36 cm2) and planimetry (0.21 ± 0.29 cm2). Conclusion Direct 3D MVA measurements from the left ventricle using transthoracic freehand scanning are more accurate than traditional 2D methods.