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KMID : 0368120070370090443
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Korean Circulation Journal
2007 Volume.37 No. 9 p.443 ~ p.448
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Spontaneous Baroreflex Sensitivity and Multifractal Hurst Analysis of Heart Rate
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Kim Jin-Soo
Jeong Eun-Young
Yum Myung-Kul
Kim Nam-Su
Kim Jun-Soo
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Abstract
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Background and Objectives：This study was designed to examine whether the multifractal Hurst exponents of heart rate can estimate activating and deactivating spontaneous baroreflex sensitivity (SBRS).
Subjects and Methods：Age and sex matched 24 healthy volunteers were placed in the supine position and head-up tilt position for 30 minutes, and the systolic blood pressure and heart rate were measured in an noninvasive manner. When the RR interval (RRI) sequence and systolic pressure sequence simultaneously increased or decreased for more than three successive beats, the slope of the linear regression line of systolic blood pressure and RR interval sequence was defined as the value of spontaneous baroreflex sensitivity (SBRS). From the RR intervals, very short-term (α range, ≤12 heartbeats), short-term (β range, ≥12 heartbeats), and the multrifractal Hurst exponents were calculated to determine the linear correlation.coefficients for SBRS.
Results：In the supine position, the linear correlation coefficients (p) of SBRS and H-5α, H-4α, H-3α, H-2α, H-1α, H1α, H2α, H3α, H4α, H5α were -0.195 (NS), -0.207 (NS), -0.232 (NS), -0.282 (NS), -0.355 (NS), -0.621 (0.003), -0.650 (0.001), -0.677 (0.001), -0.699 (0.0006) and -0.708 (0.0005), respectively. In the tilting position, the linear correlation coefficients of SBRS and H-5β, H-4β, H-3β, H-2β, H-1β, H1β, H2β, H3β, H4β, H5β were 0.024 (NS), 0.020 (NS), 0.010 (NS), -0.028 (NS), -0.193 (NS), -0.627 (0.0034), -0.607 (0.0045), -0.598 (0.0053), -0.572 (0.0084) and -0.539 (0.0141), respectively.
Conclusion：Some of the very short-term and short-term generalized Hurst exponents, such as H5α and H1β, can be used for the estimation of spontaneous baroreflex sensitivity during patient placement in the supine and head-up tilt position, respectively
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KEYWORD
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Baroreflex, Heart rate, Blood pressure
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