R. Raamat et al., Different responses of Finapres and the oscillometric finger blood pressure monitor during intensive vasomotion, J MED EN TE, 24(3), 2000, pp. 95-101
Two different techniques for non-invasive beat-to-beat finger arterial bloo
d pressure monitoring are compared in six healthy volunteers during local h
and heating from 21 to 38 degrees C. The degree of peripheral vasoconstrict
ion was established by recording the thumb pulp skin blood flow with a lase
r Doppler instrument. For time episodes without vasoconstriction no systema
tic difference in the readings of beat-to-beat mean blood pressure of the t
wo monitors was found (the oscillometric device UT9201 minus Finapres diffe
rence was 0.3 mm Hg, SD 0.3). For the episodes with vasoconstriction the di
fference was statistically significant (6.7 mm Hg, SD 2.0). The oscillometr
ic device minus Finapres difference and the laser Doppler signal were found
to be inversely correlated, the correlation coefficient varying from -0.28
to -0.67. A disagreement between the readings of the instruments during in
tensive vasomotion is assumed to be caused mainly by the tendency of the os
cillometric method to overestimate the finger mean blood pressure under the
condition of peripheral vasoconstriction.