The Nonlinear Dynamic Response of Intrapartum Fetal Heart Rate to Uterine Pressure.
The Nonlinear Dynamic Response of Intrapartum Fetal Heart Rate to Uterine Pressure.
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DOI：
10.22489/cinc.2022.268
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发表时间：
2022-09
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我们小组的研究目的是提高产时检测与胎儿酸中毒和随后的缺氧缺血性脑病（HIE）风险增加相关的心脏分娩描记术描记。我们旨在开发的检测方法必须对异常痕迹敏感，而不会引起过度的不必要干预。过去的研究表明，在分娩期间胎儿心率（FHR）对子宫压力（UP）的动态响应可以用线性系统建模。在这项研究中，我们研究了线性的假设，通过比较UP-FHR系统的线性动态和非线性动态模型的性能。线性系统由二阶状态空间模型定义。非线性系统由Hammerstein模型定义：静态非线性和线性二阶状态空间模型的级联。我们的研究结果表明，非线性动态模型优于线性系统在81.8%的UP-FHR节段。
The research objective of our group is to improve the intrapartum detection of cardiotocography tracings associated with an increased risk of developing fetal acidosis and subsequent hypoxic-ischemic encephalopathy (HIE). The detection methods that we aim to develop must be sensitive to abnormal tracings without causing excessive unnecessary interventions. Past studies showed that the dynamic response of fetal heart rate (FHR) to uterine pressure (UP) during the intrapartum could be modelled using linear systems. In this study, we examined the assumption of linearity by comparing the performance of linear dynamic and nonlinear dynamic models of the UP-FHR system. The linear systems were defined by second-order state-space models. The nonlinear systems were defined by Hammerstein models: a cascade of a static nonlinearity and a linear second-order state-space model. Our results showed that nonlinear dynamic models were better than linear systems in 81.8% of UP-FHR segments.