Andersen K, Vik-Mo H
Circulation. 1984 May;69(5):874-9. doi: 10.1161/01.cir.69.5.874.
The effects of quiet respiration on assessment of left ventricular function by two-dimensional echocardiography were investigated in 12 healthy men. End-diastolic area in the parasternal short-axis view decreased with inspiration (from 17.3 +/- 2.1 [mean +/- SD] to 16.0 +/- 2.1 cm2, p less than .01), while end-systolic area did not change (from 7.6 +/- 1.4 to 7.7 +/- 1.5 cm2; NS). A fixed cursor that was located through the center of the left ventricular area at end-expiration made a tangential cut of the area at end-inspiration were smaller along the cursor than through the center of the short-axis area both at end-diastole (1.9 +/- 1.7 mm; p less than .01) and end-systole (3.8 +/- 4.0 mm; p less than .01). Our results suggest a need for standardization with regard to respiratory phases in assessment of left ventricular function by two-dimensional echocardiography and indicate the occurrence of inspiratory reduction of left ventricular stroke volume associated with decreased diastolic filling. Motion of the heart relative to the echo beam may play a part in the respiratory variations in left ventricular dimensions assessed by M mode echocardiography.
在12名健康男性中研究了平静呼吸对二维超声心动图评估左心室功能的影响。胸骨旁短轴视图中的舒张末期面积随吸气而减小（从17.3±2.1[平均值±标准差]降至16.0±2.1cm²，p<0.01），而收缩末期面积未改变（从7.6±1.4降至7.7±1.5cm²；无显著性差异）。在呼气末通过左心室区域中心定位的固定光标，在吸气末对该区域进行切线切割，在舒张末期（1.9±1.7mm；p<0.01）和收缩末期（3.8±4.0mm；p<0.01），沿着光标方向的面积均小于通过短轴区域中心的面积。我们的结果表明，在二维超声心动图评估左心室功能时，需要对呼吸相位进行标准化，并表明与舒张期充盈减少相关的左心室每搏量吸气性减少的发生。心脏相对于回声束的运动可能在M型超声心动图评估的左心室尺寸的呼吸变化中起作用。
