Med Biol Eng Comput - Frequency range extension of spectral analysis of pulse rate variability based on Hilbert-Huang transform.

Tópicos

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Resumo

Heart rate variability (HRV) is a well-accepted indicator for neural regulatory mechanisms in cardiovascular circulation. Its spectrum analysis provides the powerful means of observing the modulation between sympathetic and parasympathetic nervous system. The timescale of HRV is limited by discrete beat-to-beat time intervals; therefore, the exploration region of frequency band of HRV spectrum is relatively narrow. It had been proved that pulse rate variability (PRV) is a surrogate measurement of HRV in most of the circumstances. Moreover, arterial pulse wave contains small oscillations resulting from complex regulation of cardiac pumping function and vascular tone at higher frequency range. This study proposed a novel instantaneous PRV (iPRV) measurement based on Hilbert-Huang transform. Fifteen healthy subjects participated in this study and received continuous blood pressure wave recording in supine and passive head-up tilt. The result showed that the very-high-frequency band (0.4-0.9?Hz) varied during head-up tilt and had strong correlation (r?=?0.77) with high-frequency band and medium correlation (r?=?0.643) with baroreflex sensitivity. The very-high-frequency band of iPRV helps for the exploration of non-stationary autoregulation and provides the non-stationary spectral evaluation of HRV without distortion or information loss.

Resumo Limpo

heart rate variabl hrv wellaccept indic neural regulatori mechan cardiovascular circul spectrum analysi provid power mean observ modul sympathet parasympathet nervous system timescal hrv limit discret beattobeat time interv therefor explor region frequenc band hrv spectrum relat narrow prove puls rate variabl prv surrog measur hrv circumst moreov arteri puls wave contain small oscil result complex regul cardiac pump function vascular tone higher frequenc rang studi propos novel instantan prv iprv measur base hilberthuang transform fifteen healthi subject particip studi receiv continu blood pressur wave record supin passiv headup tilt result show veryhighfrequ band hz vari headup tilt strong correl r highfrequ band medium correl r baroreflex sensit veryhighfrequ band iprv help explor nonstationari autoregul provid nonstationari spectral evalu hrv without distort inform loss

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