Contrast echocardiography improves interobserver agreement for wall motion score index and correlation with ejection fraction
Background: The wall motion score index (WMSI) is a surrogate for left ventricular ejection fraction (LV-EF), which becomes unreliable in poor echo windows. The value of contrast LV opacification (LVO) for WMSI assessment is not well known. Objectives: We sought to compare interobserver agreement for WMSI and the correlation between the LVO-WMSI and LV-EF using two-dimensional second harmonic (SH) and LVO echocardiography. Methods: The study comprised 100 consecutive patients (57 ± 13 years, 85% males). Two independent physicians assessed LV segmental quality and wall motion for both the SH and LVO studies according to a 17-segment model. Systolic wall motion was defined as: normokinesia, hypokinesia (systolic inward endocardial motion <7 mm), akinesia, and dyskinesia. LV-EF was assessed from the LVO images according to the biplane modified Simpson's method. Results: Of the 1,700 analyzed segments, 453 (26.6%) were poorly visualized with SH imaging, and 173 (10.2%) with LVO (P < 0.0001). The two observers agreed on segmental wall motion score in 1,299 segments (agreement 76%, Kappa 0.60) with SH imaging and in 1,491 segments (agreement 88%, Kappa 0.78) with LVO. Interobserver correlation (r2) was 0.86 for the SH-WMSI and 0.93 for the LVO-WMSI. The limits-of-agreement for interobserver LVO-WMSI (mean difference -1.0%± 6.8%, agreement -14.6%, 12.6%) was lower than that for SH-WMSI (mean difference -2.3%± 10.1%, agreement -22.5, 17.9). The LVO-WMSI correlated well with LV-EF (r2= 0.71). LV-EF could be estimated according to the formula 1.01 - 0.32 × WMSI. Conclusion: Echo-contrast improves interobserver agreement for wall motion scoring and the WMSI. The LVO-imaged WMSI correlates well with LV-EF.
|Keywords||contrast, function, left ventricle, reproducibility, wall motion|
|Persistent URL||dx.doi.org/10.1111/j.1540-8175.2010.01379.x, hdl.handle.net/1765/33919|
Galema, T.W., van de Ven, A.R.T., Soliman, O.I.I., van Domburg, R.T., Vletter, W.B., van Dalen, B.M., … Geleijnse, M.L.. (2011). Contrast echocardiography improves interobserver agreement for wall motion score index and correlation with ejection fraction. Echocardiography: a journal of cardiovascular ultrasound and allied techniques, 28(5), 575–581. doi:10.1111/j.1540-8175.2010.01379.x