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无负荷试验(non stress test,NST)亦称无应激试验.它是用胎儿监护仪监测胎心率变化的常用方法,始于60年代,70年代后逐渐在欧美普及,我国在近10年也较广泛地应用于临床,现就 NST 有关方面的问题说明如下.一、NST 监测原理:与成人相同,胎心率受交感神经和副交感神经调控,当交感神经兴奋时胎心率增速,副交感神经兴奋时胎心率减速,而两种神经的紧张度又受多种因素影响,颈动脉和主动脉弓上存在压力受体和化学受体,如脐动脉受压时,胎儿血压上升,于是压力受体起反应,使副交感神经兴奋性增强,结
Non stress test (NST), also known as stress-free test, is a common method used to monitor changes in fetal heart rate with a fetal monitor. It began in the 1960s and gradually became more common in Europe and the United States after the 1970s. Also more widely used in clinical, now on the NST related issues are described below.A, NST monitoring principle: the same with adults, fetal heart rate by the sympathetic and parasympathetic regulation, when the sympathetic excitement when the fetal heart rate growth, Parasympathetic tone when the heart rate of deceleration, while the two nerve tension and a variety of factors, the carotid and aortic arch pressure receptors and chemical receptors, such as umbilical artery compression, fetal blood pressure, then the pressure Receptors react to enhance the excitability of parasympathetic nerves