Two dimensions describe left ventricular volume change during hemodynamic transients.
Two dimensions describe left ventricular volume change during hemodynamic transients.
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二维描述了血流动力学瞬态期间左心室容积的变化。
DOI：
10.1152/ajpheart.1990.258.1.h277
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
Glantz,SA
中科院分区：
文献类型：
--
作者：
Appleyard,RF;Glantz,SA
左心室（LV）容积可以通过超声测量法测量的三个正交维度来估计。通常，基于少于三个维度的索引已经取代了体积。我们考虑左室横截面积（计算为小轴尺寸和左室三维体积的乘积）是否在应用和释放腔静脉、肺动脉和主动脉阻塞的反应中保持一致的关系，这些阻塞保持了大约30次。在6只狗中，面积和体积之间的关系是高度线性的，平均相关系数为0.98，估计的标准误差为0.9 ml。在每只狗中，三种干预措施的回归线截距有很小但有统计学意义的差异。然而，这些差异的大小平均仅为0.5 ml。腔静脉和肺动脉闭塞之间的关系没有系统差异，主动脉闭塞的关系平均仅向上移动0.8 ml。我们得出结论，在外部负荷条件下急性变化的瞬态反应中，横截面积可以代替三维体积。
Left ventricular (LV) volume can be estimated from three orthogonal dimensions measured by sonomicrometry. Often, an index based on fewer than three dimensions has been substituted for volume. We consider whether a consistent relationship between LV cross-sectional area, computed as the product of the minor axes dimensions and LV three-dimensional volume, is maintained throughout the responses to application and release of vena caval, pulmonary artery, and aortic occlusions, which were held for approximately 30 beats. In six dogs, the relationship between area and volume was highly linear, with an average correlation of 0.98 and standard error of the estimate of 0.9 ml. Within each dog, there were small but statistically significant differences in the intercepts in the regression lines among the three interventions. However, the magnitude of these differences averaged only 0.5 ml. There was not a systematic difference between the relationship for vena caval and pulmonary artery occlusions, and the relationship for aortic occlusions shifted upward by an average of only 0.8 ml. We conclude that cross-sectional area can be substituted for the three-dimensional volume during the transient responses to acute alterations in the external load conditions.