Hypertension, Vol 21, 866-874, Copyright © 1993 by American Heart Association
T Sato, M Nishinaga, A Kawamoto, T Ozawa and H Takatsuji
A validation study of the continuous noninvasive tonometric blood pressure
monitor called JENTOW was performed in 20 normotensive subjects and 10
hypertensive patients. Tonometric and intra-arterial blood pressures were
simultaneously recorded at supine rest and during a Valsalva maneuver and
tilting test. The results of the strict evaluation of the instrument's
capacity for reproducing intra-arterial blood pressure were as follows: 1)
The overall frequency response of the transcutaneous blood
pressure-monitoring system based on arterial tonometry was flat, with
negligible delay to intra-arterial blood pressure in the range of 0-5 Hz.
2) The largest discrepancy between intra-arterial and tonometric pressure
waveforms was found at the early systolic phase; except for this phase, the
tonometric waveform was almost equal to the intra-arterial waveform. 3) The
beat-to-beat variability of tonometric pressure corresponded to that of
intra- arterial pressure almost perfectly in the physiologically
significant frequency range of 0-0.5 Hz. 4) During resting conditions, the
averages of the systolic and diastolic values measured tonometrically
corresponded well to those measured intra-arterially. 5) The changes in the
between-method discrepancy of blood pressure values during the Valsalva
maneuver were statistically significant but small (< 5 mm Hg). 6) No
significant effect of postural tilting was found on the between- method
discrepancy. We conclude that this method is clinically acceptable and
reliable except for its limited capacity for recording the higher frequency
intra-arterial waveform and for responding to the relatively rapid and
large transient changes in blood pressure.
ARTICLES
Accuracy of a continuous blood pressure monitor based on arterial tonometry
Department of Physiology, Kochi Medical School, Japan.
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