Murata Y, Martin C B, Ikenoue T, Petrie R H
Am J Obstet Gynecol. 1980 Mar 1;136(5):603-8. doi: 10.1016/0002-9378(80)91011-x.
The VET of the fetal cardiac cycle, measured as the interval between the semilunar valve opening and closing signals of the ultrasound Doppler cardiogram, was studied in chronically catheterized fetal rhesus monkeys. VET varied inversely with FHR between approximately 150 and 250 bpm. Below 150 bpm, however, there was no further prolongation of VET. VET was not related to gestational age. VET, corrected for heart rate, was shortened in the presence of combined hypoxemia and acidosis, but not when either hypoxemia or acidemia was present alone. Corrected VET was shortened by epinephrine, but was not consistently altered by atropine. VET was not affected by changes in the concentration of glucose in fetal blood.
在慢性插管的恒河猴胎儿中，研究了胎儿心动周期的心室射血时间（VET），通过超声多普勒心动图测量半月瓣开放和关闭信号之间的时间间隔。在大约150至250次/分钟的心率范围内，VET与胎心率呈反比。然而，在低于150次/分钟时，VET不再进一步延长。VET与胎龄无关。在合并低氧血症和酸中毒时，校正心率后的VET缩短，但单独存在低氧血症或酸血症时则不然。肾上腺素可缩短校正后的VET，但阿托品对其影响并不一致。胎儿血液中葡萄糖浓度的变化不影响VET。
