Hypertension, Vol 22, 26-33, Copyright © 1993 by American Heart Association
S Omboni, G Parati, A Frattola, E Mutti, M Di Rienzo, P Castiglioni and G Mancia
The aim of our study was to assess whether the Finapres device is able to
accurately monitor not only average blood pressure values but also blood
pressure variability. To examine this issue, we analyzed 30- minute
recordings of finger and intra-arterial pressure simultaneously obtained at
rest in 14 patients. We compared systolic blood pressure, diastolic blood
pressure, mean arterial pressure, pulse interval (the reciprocal of heart
rate), overall variability (standard deviation), and specific time-domain
and frequency-domain components. Systolic blood pressure, diastolic blood
pressure, mean arterial pressure, and pulse interval spectral powers were
computed by fast Fourier transform over three frequency bands: low
frequency (0.025 to 0.07 Hz), midfrequency (0.07 to 0.14 Hz), and high
frequency (0.14 to 0.35 Hz). The coherence, ie, the degree of association
between blood pressure and pulse interval powers obtained by the two
techniques, was also assessed. Standard deviations of diastolic blood
pressure, mean arterial pressure, and pulse interval were similar when
assessed from the two recordings, whereas standard deviation of systolic
blood pressure was overestimated by analysis of finger pressure recordings.
All powers of diastolic blood pressure and mean arterial pressure and
high-frequency powers of systolic blood pressure estimated from analysis of
finger blood pressure tracings were superimposable to those obtained by
analyzing invasive recordings. Low-frequency and midfrequency powers of
intra-arterial systolic blood pressure were significantly overestimated by
the analysis of finger blood pressure tracings (+13.7 +/- 4.4 mm Hg2, P
< .01, and +2.3 +/- 0.9 mm Hg2, P < .05).(ABSTRACT TRUNCATED AT 250
WORDS)
ARTICLES
Spectral and sequence analysis of finger blood pressure variability. Comparison with analysis of intra-arterial recordings
Cattedra di Medicina Interna, Ospedale S. Gerardo, Monza, Italy.
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