Spectral coherence between blood pressure and inter-beat intervals in hypertension

Continuous registration of blood pressure (BP) was obtained in 31 normotensives and 76 hypertensives (divided into 3 stages of hypertension) by a method where the blood pressure in a human finger was measured non-invasively in a beat-by-beat fully calibrated manner. From this signal, the power densi...

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Bibliographic Details
Published inCentral European journal of public health Vol. 7; no. 4; p. 185
Main Authors Danev, S, Datzov, E, Svetoslavov, S, Mikhov, D, Markova, P, Girchev, R
Format Journal Article
LanguageEnglish
Published Czech Republic 01.11.1999
Subjects
Adult
Blood Pressure
Case-Control Studies
Fourier Analysis
Heart Conduction System
Humans
Hypertension - physiopathology
Linear Models
Middle Aged
Models, Cardiovascular
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Summary:Continuous registration of blood pressure (BP) was obtained in 31 normotensives and 76 hypertensives (divided into 3 stages of hypertension) by a method where the blood pressure in a human finger was measured non-invasively in a beat-by-beat fully calibrated manner. From this signal, the power density spectra of inter-beat intervals (IBI), systolic blood pressure (SBP) and diastolic blood pressure (DBP) were derived. Total spectral power (TP) and low/high spectral frequency ratios of all spectra were calculated. Cross-correlation analysis between IBI, SBP and DBP spectra showed that the level of amplitude and phase spectral coherence (SC) was strongly dependent of the stage of hypertension. SC was calculated by means of appropriate mathematical algorithms. Multiple step regression analysis pointed out that the observed phenomenon is highly significant for both--the amplitude and the phase SC (p < 0.01).
ISSN:1210-7778