Assessment of cardiac output by the Doppler ultrasound technique alone.
Assessment of cardiac output by the Doppler ultrasound technique alone.
复制标题
单独通过多普勒超声技术评估心输出量。
作者：
N. Haites;F. McLennan;D. H. Mowat;J. Rawles
应用无创性多普勒超声技术，建立了140例健康成人主动脉血流速度的正常范围。每一次心跳的速度-时间曲线下的面积积分得出每搏距离，当乘以心率时，得出分钟距离。每搏距离和每分钟距离分别是每搏输出量和心输出量的指标，两者都呈进行性下降，年龄约为成年后每年1%。卒中距离在患者组间的差别最大，与年龄校正正常值相比，12例孕妇增加了43%，16例心肌梗塞后恢复期患者正常，15例高血压患者减少了14%，12例心房颤动患者减少了31%，13例心力衰竭患者减少了43%。单独测量主动脉血流速度及其导数，而不确定主动脉大小，是一种安全、简单和生理上有效的评估心输出量的方法。
The normal range of aortic blood velocity was established in 140 healthy adults, using a non-invasive Doppler ultrasound technique. Integration of the area under the velocity-time curve for each heart beat gave stroke distance, which, when multiplied by heart rate, gave minute distance. Stroke distance and minute distance are an indication of stroke volume and cardiac output respectively and both show a progressive decline with age of about 1% per annum of adult life. Stroke distance gave the greatest discrimination between patient groups and, compared with age corrected normal values, was increased by 43% in 12 pregnant women, normal in 16 patients convalescing after myocardial infarction, and decreased by 14% in 15 patients with hypertension, by 31% in 12 patients with atrial fibrillation, and by 43% in 13 patients with cardiac failure. Measurement of aortic blood velocity and its derivatives alone, without determination of aortic size, is a safe, simple, and physiologically valid way of assessing cardiac output.