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 3×10-5 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.
Broad-band spectral analysis of 24 h continuous finger blood pressure: comparison with intra-arterial recordings
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Paolo CASTIGLIONI, Gianfranco PARATI, Stefano OMBONI, Giuseppe MANCIA, Ben P. M. IMHOLZ, Karel H. WESSELING, Marco DI RIENZO; Broad-band spectral analysis of 24 h continuous finger blood pressure: comparison with intra-arterial recordings. Clin Sci (Lond) 1 August 1999; 97 (2): 129–139. doi: https://doi.org/10.1042/cs0970129
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