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Broad band spectral analysis of 24 h continuous finger blood pressure: Comparison with intra-arterial recordings

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Author: Castiglioni, P. · Parati, G. · Omboni, S. · Mancia, G. · Imholz, B.P.M. · Wesseling, K.H. · Rienzo, M. di
Type:article
Date:1999
Institution: TNO Biomedical Instrumentation
Source:Clinical Science, 2, 97, 129-139
Identifier: 280445
doi: DOI:10.1042/CS19980405
Keywords: Biology · Blood pressure monitoring · Blood pressure variability · Non-invasive blood pressure measurement · Portapres · Power spectral analysis · Adult · Aging · Blood Pressure Monitoring, Ambulatory · Brachial Artery · Circadian Rhythm · Fingers · Humans · Hypertension · Middle Aged · Reference Values · Signal Processing, Computer-Assisted

Abstract

The present study compares the spectral characteristics of 24-h blood pressure variability estimated invasively at the brachial artery level with those estimated by measurement of blood pressure at the finger artery using the non-invasive Portapres device. Broad-band spectra (from 3 x 10<sup>-5</sup> to 0.5 Hz) were derived from both finger and intra-brachial pressures recorded simultaneously for 24 h in eight normotensive and twelve hypertensive ambulant subjects. At frequencies lower than 0.07 Hz, higher spectral estimates were obtained by Portapres than by intra-brachial measurements. The maximum overestimation occurred in systolic pressure at around 10<sup>-2</sup> Hz, where the amplitude of the oscillations was two times greater when measured by Portapres. A less pronounced overestimation was found for diastolic pressures. The maximum overestimation was greater during daytime than during night-time. At around 0.1 Hz, invasive and non-invasive spectra were similar. At the respiratory frequencies (0.15-0.50 Hz), the power spectra were overestimated by Portapres during daytime, and underestimated at night. These results provide reference information for the correct interpretation of Portapres data in the estimation of 24-h blood pressure spectral power.