Fetal QT Interval Estimation Using Sequential Hypothesis Testing.

Fetal QT Interval Estimation Using Sequential Hypothesis Testing.
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使用序贯假设检验估计胎儿 QT 间期。

DOI:
10.1109/tbme.2017.2661248
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发表时间:
2017
期刊:
IEEE transactions on bio-medical engineering
影响因子:
--
通讯作者:
Wakai,RonaldT
Wakai,RonaldT
中科院分区:
--
文献类型:
--
作者:
Yu,Suhong;VanVeen,BarryD;Lutter,WilliamJ;Wakai,RonaldT

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目的:最近利用胎儿心脏磁图的研究已经证明了校正QT间期(QTc)测量在长QT综合征的子宫诊断和预后中的有效性,长QT综合征是生命早期猝死的主要原因。本研究的目的是制定和检验一种新的统计估计方法来检测胎儿t波结束,从而提高胎儿QT间期测量的准确性。方法:为了检测t波的结束,我们采用顺序复合假设检验来确定t波何时返回基线。该方法将广义似然比检验与利用心脏信号重复性的低秩时空模型结合使用。利用最大似然估计确定未知模型参数。结果:在实际模拟中,即使在噪声与信号比高达6的情况下,探测器也被证明准确到10毫秒(95%的预测区间)。当应用于正常胎儿的真实数据时,探测器与心脏病学家的测量结果(1.46.9 ms)非常吻合。结论:该方法有效、实用。尽管持续存在强烈的母体干扰,探测器的性能仍然很好。意义:该检测器可作为基于主观评价的传统测量的有价值的辅助。
Objective: Recent studies utilizing fetal magnetocardiography have demonstrated the efficacy of corrected QT interval (QTc) measurement for in utero diagnosis and prognosis of long QT syndrome, a leading cause of sudden death in early life. The objective of the study was to formulate and test a novel statistical estimation method to detect the end of the fetal T-wave and thereby improve the accuracy of fetal QT interval measurement.Methods: To detect the end of the T-wave, we apply a sequential composite hypothesis test to decide when the T-wave has returned to baseline. The method uses the generalized likelihood ratio test in conjunction with a low-rank spatiotemporal model that exploits the repetitive nature of cardiac signals. The unknown model parameters are determined using maximum likelihood estimation.Results: In realistic simulations, the detector was shown to be accurate to within 10 ms (95% prediction interval), even at noise-to-signal ratios as high as 6. When applied to real data from normal fetuses, the detector agreed well with measurements made by cardiologists (1.46.9 ms).Conclusions: The method was effective and practical. Detector performance was excellent despite the continual presence of strong maternal interference.Significance: This detector serves as a valuable adjunct to traditional measurement based on subjective assessment.
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发表时间: 1997
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影响因子: 37.8
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