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分娩期间,胎儿的脐带受压能产生包括血液动力学,神经病学在内的心血管反应,这种反应通过迷走神经传递。脐带受压产生一个“V”字形的胎心率图型,在心搏徐缓的下降中,此反应是突然的,在上升至基线水平时,一般也是突然的,V 波或可变性减慢通常有短暂的持续时间,可在正常范围内减缓或确实低于正常范围,这种可变性减缓与低血氧症和酸中毒有潜在性关系。在脐带受压的基础 V 字波型上又有许多变异,其中与胎儿结局不佳有关的变异包括:(1)胎心率延迟恢复到基线性;(2)在减缓期跳跳间差消失;(3)减缓前、后胎心率不能立即加速;(4)减缓后异常加速;(5)减缓后胎心率基线的变化;(6)整个倾斜范围增加;(7)重复减缓或
During childbirth, the umbilical cord compression of the fetus can produce cardiovascular responses, including hemodynamics and neurology, which are transmitted through the vagus nerve. The umbilical cord is compressed to produce a “V” shaped pattern of fetal heart rate, which is abrupt in the slow declination of the heartbeat and is generally abrupt when it rises to baseline levels, with slow V-waves or variability usually Short durations may slow down or indeed fall below the normal range in the normal range, and this variability may have a potential relationship with hypoxemia and acidosis. There are many variations in the underlying V-wave pattern of umbilical cord compression, with variations associated with poor fetal outcomes including: (1) a delay in the recovery of fetal heart rate to baseline; (2) a loss of jump between slowing jumps ; (3) slowing before and after the fetal heart rate can not be immediately accelerated; (4) slowed down after abnormal acceleration; (5) slowed baseline changes in fetal heart rate; (6) the entire tilt range increases; (7)