2nd Department of Cardiology, Medical University, Lodz, Poland.
Kardiol Pol. 2009 Oct;67(10):1070-6.
Speckle tracking echocardiography (STE) requires special image processing for complex assessment of left ventricular (LV) function, including strain and rotation.
To evaluate a novel M-mode STE technique as a readily applicable approach, providing potential insights into LV deformation.
Fifty one patients (mean age 52 +/- 14 years, 24 women) with normal or impaired LV function (mean LVEF 51 +/- 16%, range between 14% and 66%) were studied. Left ventricular rotation at mitral valve and apical level was measured using dedicated conventional STE software. Grey-scale short axis digital loops at mitral valve level were also used to obtain M-mode STE images, presenting the movement of LV wall speckles along the cursor, with the LV cavity left out. Then, the distance of peak systolic shift (PSS) was measured for one selected speckle.
Mean rotation at mitral valve level was 7.4 +/- 3.1 degrees , apical rotation was 7.6 +/- 6.4 degrees and LV torsion was 14.9 +/- 7.1 degrees . Measurement of PSS with a novel M-mode STE approach was feasible in all patients, producing a mean value of 7 +/- 2 mm. Subsequently, two subsets with PSS of less than 7 mm and PSS equal to or above 7 mm showed a significant difference between mean LV torsion of 10.7 degrees and 17.0 degrees , respectively (p = 0.002). In the ROC analysis, PSS cut-off value of less than or equal to 7 mm yielded a sensitivity of 92% and a specificity of 61% to predict LV torsion < 10.7 degrees (p < 0.0001).
M-mode STE appears to be a feasible approach to detect movement of speckles and to measure PSS within the LV inferior and septal wall in short axis view images. PSS cut-off value of less than 7 mm indicates significantly lower LV torsion. Further studies are required to assess the potential role of M-mode STE in cardiac imaging.
斑点追踪超声心动图（STE）需要特殊的图像处理来对左心室（LV）功能进行复杂评估，包括应变和旋转。
评估一种新的 M 模式 STE 技术作为一种易于应用的方法，为 LV 变形提供潜在的见解。
研究了 51 例（平均年龄 52 ± 14 岁，24 名女性）左心室功能正常或受损的患者（平均 LVEF 51 ± 16%，范围在 14%至 66%之间）。使用专用的常规 STE 软件测量二尖瓣和心尖水平的左心室旋转。在二尖瓣水平也使用灰阶短轴数字环获得 M 模式 STE 图像，显示 LV 壁斑点沿光标移动，LV 腔被排除在外。然后，测量一个选定斑点的收缩期峰值移位（PSS）的距离。
二尖瓣水平的平均旋转为 7.4 ± 3.1 度，心尖旋转为 7.6 ± 6.4 度，LV 扭转为 14.9 ± 7.1 度。使用新的 M 模式 STE 方法测量 PSS 在所有患者中都是可行的，产生的平均值为 7 ± 2 毫米。随后，PSS 值小于 7 毫米和等于或大于 7 毫米的两个子集之间的平均 LV 扭转有显著差异，分别为 10.7 度和 17.0 度（p = 0.002）。在 ROC 分析中，PSS 截断值小于或等于 7 毫米时，预测 LV 扭转<10.7 度的敏感性为 92%，特异性为 61%（p<0.0001）。
M 模式 STE 似乎是一种可行的方法，可以检测 LV 下壁和间隔壁短轴视图图像中斑点的运动并测量 PSS。PSS 截断值小于 7 毫米表明 LV 扭转明显降低。需要进一步的研究来评估 M 模式 STE 在心脏成像中的潜在作用。
