Targett R C, Heldt G P, McIlroy M B
Cardiovasc Res. 1986 Nov;20(11):816-21. doi: 10.1093/cvr/20.11.816.
A pulsed, range gated, directional, ultrasonic, Doppler blood velocity meter was used to record signals from the pulmonary artery in 52 normal subjects ranging in age from less than 1 week to over 30 years. Signals were obtained from an unfocused transducer in the second or third left intercostal space using a 2.25 MHz instrument. The increase in mean velocity at the start of systole followed a linear pattern for at least the first 45 ms of ejection, irrespective of the age or size of the subject. The value for the acceleration at the start of systole decreased during childhood, reaching less than half that in the aorta in adults, and the duration of the linear increase in velocity increased. The pulmonary arterial signals in newborn infants closely resembled those in the aorta. The range of frequencies seen in the sample volume in the adult pulmonary arterial signals was greater than that in the aorta, whereas in infants it was indistinguishable from that in the aorta.
使用一台脉冲、距离选通、定向、超声多普勒血流速度仪，记录了52名年龄从不到1周至30多岁的正常受试者肺动脉的信号。使用一台2.25兆赫的仪器，通过位于左第二或第三肋间间隙的非聚焦换能器获取信号。无论受试者的年龄或体型如何，在收缩期开始时平均速度的增加至少在射血的前45毫秒内呈线性模式。收缩期开始时的加速度值在儿童期降低，降至不到成人主动脉加速度值的一半，且速度线性增加的持续时间延长。新生儿的肺动脉信号与主动脉信号非常相似。在成人肺动脉信号的取样容积中看到的频率范围大于主动脉中的频率范围，而在婴儿中则与主动脉中的频率范围无法区分。
