Wakai R T, Wang M, Pedron S L, Reid D L, Martin C B
Department of Medical Physics, University of Wisconsin-Madison.
Early Hum Dev. 1993 Nov 1;35(1):15-24. doi: 10.1016/0378-3782(93)90134-g.
Fetal heart rate variability was derived from fetal magnetocardiogram recordings in ten subjects at gestation ages 32-38 weeks. Maternal interference was negligible and R-wave detection was highly reliable. Oscillations suggestive of respiratory sinus arrhythmia (RSA) were prominent in many of the heart rate tracings. Spectral analysis was used to quantify heart rate variability and to examine the influence of the RSA-like oscillations on heart rate variability. The oscillations were associated with increased power in the frequency range 0.4-1.0 Hz (P < or = 0.05). Magnetic recording appears to offer significant advantages for investigation of beat-to-beat fetal heart rate throughout the latter stages of pregnancy.
在10名孕龄为32 - 38周的受试者中，从胎儿心磁图记录中获取胎儿心率变异性。母体干扰可忽略不计，R波检测高度可靠。在许多心率描记图中，提示呼吸性窦性心律不齐（RSA）的振荡很明显。采用频谱分析来量化心率变异性，并研究类似RSA的振荡对心率变异性的影响。这些振荡与0.4 - 1.0赫兹频率范围内功率增加相关（P≤0.05）。磁记录似乎为妊娠后期逐搏胎儿心率的研究提供了显著优势。
