PMID: 9532415Apr 9, 1998Paper

Spontaneous blood pressure oscillations and cerebral autoregulation

Clinical Autonomic Research : Official Journal of the Clinical Autonomic Research Society
R R DiehlP Berlit

Abstract

The relationship between spontaneous oscillations in cerebral blood flow velocity (CBFV) and arterial blood pressure (ABP) was analysed in normal subjects in order to evaluate whether these relationships provide information about cerebral autoregulation. CBFV was measured using transcranial Doppler sonography and continuous ABP and heart rate using Finapres in 50 volunteers. Measurements were made over 5 min in a supine position and 6 min in a tilted position. Coefficients of variation were calculated using power- and cross-spectral analysis in order to quantify amplitudes within two frequency ranges: 3-9 cycles per min (cpm) (M-waves); and 9-20 cpm (R-waves). Correlations, coherence values, phase angle shifts and gains were also computed between corresponding waves in CBFV and in ABP. A clear correlation was seen for M-waves and R-waves between CBFV and ABP and coherence values were large enough to calculate phase angle shifts and gains. Phase angles for M-waves were larger and gains lower than was the case for R-waves, either tilted or supine. These data are consistent with a highpass filter model of cerebral autoregulation. Relatively high CBFV/ABP gain values (between 1.4 and 2.0) suggest that the principle of frequency-dep...Continue Reading

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Citations

Apr 17, 2009·Clinical Autonomic Research : Official Journal of the Clinical Autonomic Research Society·Ronney B Panerai
Sep 18, 2007·Medical & Biological Engineering & Computing·Ben-Yi LiauYu-Chou Tsai
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