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Quantification of mitral valve stenosis by three-dimensional transesophageal echocardiography
I Kupferwasser1, S Mohr-Kahaly, T Menzel
1II Medical Clinic, University of Mainz, Germany.
Insights
Transesophageal 3D echocardiography offers new topographic insights for mitral valve stenosis diagnosis. This advanced imaging method provides quantitative measurements, avoiding errors common in 2D and Doppler techniques.
Area of Science:
- Cardiology
- Medical Imaging
- Echocardiography
Background:
- Mitral valve stenosis diagnosis relies on various imaging modalities.
- Limitations exist in conventional 2D and Doppler echocardiography for precise mitral valve assessment.
Purpose of the Study:
- To evaluate the diagnostic potential of transesophageal 3D echocardiography for mitral valve stenosis.
- To compare 3D echocardiography measurements with transthoracic echocardiography, Doppler, and invasive data.
Main Methods:
- Investigated 54 patients using transthoracic and transesophageal 3D echocardiography.
- Acquired 3D data via automatic transducer rotation, with ECG and respiration gating.
- Measured mitral valve orifice area by planimetry and reconstructed 3D views for topographic information.
Main Results:
- 3D echocardiography showed small mean differences compared to transthoracic planimetry (0.3 cm2), Doppler (0.2 cm2), and invasive data (0.1 cm2).
- Significant differences were noted in patients with severe calcification or aortic regurgitation.
- Diagnostic quality 3D datasets were obtained in 78% of patients, with new topographic information in 69%.
Conclusions:
- Transesophageal 3D echocardiography provides valuable new topographic information in mitral valve stenosis.
- It enables a quantitative method that circumvents image plane positioning errors and flow-dependent calculations.
- Despite limitations in image quality in some cases, 3D echocardiography enhances mitral valve stenosis evaluation.
Abstract:
The aim of this study was the evaluation of the diagnostic potentials of transesophageal 3D- echocardiography in the determination of mitral valve stenosis. 54 patients were investigated by transthoracic and multiplane transesophageal echocardiography. In 41 patients cardiac catheterization was performed. 3D- echocardiographic data acquisition was performed by automatic transducer rotation at 2 degree increments over a span of 180 degrees. The transesophageal probe was linked to an ultrasound unit and to a 3D- workstation capable of ECG- and respiration gated data acquisition, postprocessing and 2D/3D image reconstruction. The mitral valve was visualized in sequential cross-sectional planes out of the 3D data set. The spatial position of the planes was indicated in a reference image. In the cross-sectional plane with the narrowest part of the leaflets the orifice area was measured by planimetry. For topographic information a 3D view down from the top of the left atrium was reconstructed. Measurements were compared to conventional transthoracic planimetry, to Doppler-echocardiographic pressure half time and to invasive data. The mean difference to transthoracic planimetry, pressure half time and to invasive measurements were 0.3 +/- 0.1 cm2, 0.2 +/- 0.1 cm2 and 0.1 +/- 0.1 cm2, respectively. Remarkable differences between the 3D- echocardiographic and the 2D- or Doppler- echocardiographic methods were observed in patients with severe calcification or aortic regurgitation. In 22% of the patients the 3D data set was not of diagnostic quality. New diagnostic information from a 3D view of the mitral valve could be obtained in 69% of the patients. Thus, although image quality is limited, 3D- echocardiography provides new topographic information in mitral valve stenosis. It allows the use of a new quantitative method, by which image plane positioning errors and flow-dependent calculation is avoided.