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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Photoplethysmogram variability ： ウィキペディア英語版 Photoplethysmogram variability The photoplethysmogram (PPG) measurement made at a peripheral site, such as the finger, ear or forehead represents the volume of blood in the vessel at the site of measurement. The PPG signal consists of pulses that reflect the change in vascular blood volume with each cardiac beat. Beat-to-beat fluctuations, known as photoplethysmogram variability (PPGV) are found in the signal baseline and amplitude which reflects various physiological influences such as respiration and regulation of vascular tone by the sympathetic nervous system. ==Frequency domain (spectral) features== The beat-to-beat variation of the PPG in time domain can be represented in the frequency domain by means of signal transformation methods, such as Fast Fourier Transform or autoregressive model. The spectrum can be divided into two main bands, that is, low frequency (LF) band ranging from 0.04 to 0.15 Hz and high frequency (HF) band between 0.15 and 0.6 Hz. The LF band can be subdivided into a mid-frequency (MF) band from 0.09 Hz to 0.15 Hz.〔P.M. Middleton, C.H. Tang, G.S. Chan, S. Bishop, A.V. Savkin, and N.H. Lovell, ''Peripheral photoplethysmography variability analysis of sepsis patients'', Med Biol Eng Comput, 2010〕 The integration of the power spectral density over the frequency range will give the spectral power. Low-frequency oscillation in the PPG is found to reflect the sympathetic control over the peripheral circulation, whilst the high frequency component is related to the mechanical consequence of respiration on venous return.〔〔L. Bernardi, A. Radaelli, P.L. Solda, A.J. Coats, M. Reeder, A. Calciati et al., ''Autonomic control of skin microvessels: assessment by power spectrum of photoplethysmographic waves'', Clin Sci (Lond), vol. 90, no. 5, pp. 345-55, 1996.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Photoplethysmogram variability」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.