室上性期前收缩胎儿的胎心率变异性频谱分析。

Spectral analysis of fetal heart rate variability in fetuses with supraventricular extrasystoles.

作者信息

Troeger Carolyn, Schaub Andreas F, Bernasconi Paolo, Hösli Irene, Holzgreve Wolfgang

机构信息

Department of Obstetrics and Gynaecology, University of Basel, Basel, Switzerland.

出版信息

Fetal Diagn Ther. 2003 Jul-Aug;18(4):284-8. doi: 10.1159/000070811.

DOI:10.1159/000070811

PMID:12835591

Abstract

OBJECTIVE

Fetal heart rate (FHR) variability is an important indicator of fetal well-being. In fetal tachyarrhythmias, however, visual analysis of FHR variability is limited. We therefore applied power spectral analysis of FHR to evaluate the fetal state.

METHODS

Fetal R-R intervals were detected by means of an external ECG in 3 fetuses with supraventricular extrasystoles after cardiac malformations had been excluded by fetal echocardiography. Using an autoregressive model, power spectral densities were calculated from 20 consecutive 256-beat segments for the following frequency bands: <0.03 Hz (very low frequency), 0.03-0.069 Hz (low frequency; LF), 0.07-0.129 Hz (mid-frequency) and 0.13-1.0 Hz (high frequency; HF).

RESULTS

The FHR variability in fetal supraventricular extrasystoles mainly resulted from the HF component (63.91 +/- 6.97%). The sympatho-vagal balance (LF/HF) was decreased in the tracings with extrasystoles (0.13).

CONCLUSION

The analysis of FHR variability in fetal supraventricular extrasystoles revealed an imbalance between sympathetic and parasympathetic regulation.

摘要

目的

胎儿心率（FHR）变异性是胎儿健康的重要指标。然而，在胎儿心律失常中，对FHR变异性的视觉分析是有限的。因此，我们应用FHR的功率谱分析来评估胎儿状态。

方法

通过外部心电图检测3例胎儿的R-R间期，这些胎儿在经胎儿超声心动图排除心脏畸形后出现室上性期前收缩。使用自回归模型，从20个连续的256次心跳节段计算以下频段的功率谱密度：<0.03Hz（极低频）、0.03 - 0.069Hz（低频；LF）、0.07 - 0.129Hz（中频）和0.13 - 1.0Hz（高频；HF）。