Laboratory of Biophysics, Department of Research and Education, Taipei Veterans General Hospital, Taiwan.
J Clin Monit Comput. 2011 Jun;25(3):183-91. doi: 10.1007/s10877-011-9291-3. Epub 2011 Aug 9.
To investigate the effect of pregnancy on the pulse wave of the mother.
Pulse waveforms recorded via a pulse oximeter from the left index finger of non-pregnant women and pregnant women in the three trimesters of pregnancy were Fourier transformed into power spectra. Spectral indices of the power spectra of pulse waveform were obtained and compared among non-pregnant women and pregnant women in the three trimesters of pregnancy.
The power of harmonics of pulse wave decayed exponentially with respect to the order of harmonics. The exponent and initial value of exponential decay for the power of harmonics and the power of the 2nd harmonic were increased, whereas the total power of pulse and the powers of higher order harmonics were decreased during pregnancy.
The power of harmonics of pulse wave can be described by an exponential decay function with respect to the order of harmonics in both non-pregnant and pregnant women. The effects of pregnancy on the pulse wave are the reduction in the total power of pulse and the power of higher order harmonics, and the increase in the power of lower order harmonics in the power spectrum of pulse wave. This effect of pregnancy on the pulse wave might be caused by the decrease in vascular resistance during pregnancy, the increase in workload on the heart due to increased demand of the growing fetus, and the aortocaval compression caused by the progressively enlarged gravid uterus and fetus.
探讨妊娠对母亲脉搏波的影响。
使用脉搏血氧仪记录非孕妇和妊娠三个时期孕妇左手食指的脉搏波，将脉搏波的傅立叶变换为功率谱。获取脉搏波功率谱的谱指数，并比较非孕妇和妊娠三个时期孕妇之间的差异。
脉搏波谐波的功率随谐波阶数呈指数衰减。妊娠期间，谐波的功率和二阶谐波的功率的指数和初始值增加，而脉搏的总功率和更高阶谐波的功率降低。
在非孕妇和孕妇中，脉搏波的谐波功率可以用指数衰减函数来描述。妊娠对脉搏波的影响是脉搏总功率和高阶谐波功率降低，以及脉搏波功率谱中低阶谐波功率增加。这种妊娠对脉搏波的影响可能是由于妊娠期间血管阻力降低、由于胎儿生长需求增加导致心脏工作量增加以及逐渐增大的子宫和胎儿引起的主动脉-腔静脉压迫所致。
