J Clin Monit Comput - Power spectral analysis of plethysmographic pulse waveform in pregnant women.


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JECTIVE: To investigate the effect of pregnancy on the pulse wave of the mother.PATIENTS AND METHODS: 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.RESULTS: 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.CONCLUSION: 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.

Resumo Limpo

jectiv investig effect pregnanc puls wave motherpati method puls waveform record via puls oximet left index finger nonpregn women pregnant women three trimest pregnanc fourier transform power spectra spectral indic power spectra puls waveform obtain compar among nonpregn women pregnant women three trimest pregnancyresult power harmon puls wave decay exponenti respect order harmon expon initi valu exponenti decay power harmon power nd harmon increas wherea total power puls power higher order harmon decreas pregnancyconclus power harmon puls wave can describ exponenti decay function respect order harmon nonpregn pregnant women effect pregnanc puls wave reduct total power puls power higher order harmon increas power lower order harmon power spectrum puls wave effect pregnanc puls wave might caus decreas vascular resist pregnanc increas workload heart due increas demand grow fetus aortocav compress caus progress enlarg gravid uterus fetus

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