Title
Broad band spectral analysis of 24 h continuous finger blood pressure: Comparison with intra-arterial recordings
Author
Castiglioni, P.
Parati, G.
Omboni, S.
Mancia, G.
Imholz, B.P.M.
Wesseling, K.H.
di Rienzo, M.
TNO Biomedical Instrumentation
Publication year
1999
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 10-5 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 10-2 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.
Subject
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
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http://resolver.tudelft.nl/uuid:6bade201-7186-4a71-81ea-f5ebc733c94e
DOI
https://doi.org/10.1042/cs19980405
TNO identifier
280445
ISSN
0143-5221
Source
Clinical Science, 97 (2), 129-139
Document type
article