Accuracy of mitral valve area in patients with mitral stenosis measured by echocardiography : Compared with operative mitral valve area

摘要

Background Measurement of echocardiographic mitral valve area (MVA) is an useful noninvasive method of estimating the stenotic mitral valve area. This study was undertaken to evaluate the accuracy of echocardiographic MVA measurement by comparing MVAs measured by the planimetric and pressure half-time method versus direct MVA measurement by using a cone shaped device specifically made for direct measurement of MVA. Methods and Results The study population consisted of 22 consecutive patients from August 1993 to February 1996. All the patients underwent 2D planimetry and Doppler echocardiographic MVA measurement before and after valve replacement surgery ; direct measurement also was performed after surgery. Five patients (22.7%) had normal sinus rhythm, and the rest of the patients had atrial fibrillation. Two-dimensional echocardiographic examinations were attempted in 22 patients, and adequate measurements were obtained in 21 of the patients studied. Mean mitral valve area were 0.99±0.32cm (2) ranged from 0.42 to 1.68cm (2) on 2D planimetry method, 0.93±0.32cm (2) ranged from 0.42 to 1.68cm (2) on Doppler pressure half-time method, 1.17±0.20cm (2) ranged from 0.93 to1.68cm (2) on direct measurement of mitral valve area after surgery. 2D planimetry method (r=0.621, p=0.003, SE=0.165), pressure half-time method (r=0.454, p=0.003, SE=0.187), and transmitral peak velocity (r=-0.480, p=0.026, SE=0.189) was relatively well correlate with operative mitral valve area. There was relatively good agreement between direct and 2D planimetric measurement and between direct and Dopler pressure-half time method. Conclusion 2D planimetry and Doppler pressure half-time method on echocardiography are useful, noninvasive measurement method in patients with mitral stenosis.