Comparison of invasive and non-invasive measurement of spontaneous baroreflex during anesthesia.
BACKGROUND
Many works have shown that beat-to-beat variations in systolic arterial pressure (SAP) could be used for the assessment of cardiac baroreflex function. The purpose of this study was to evaluate whether Finapres, a non-invasive device to measure systolic arterial pressure, could serve as an acceptable alternative to intra-arterial catheterization for assessing the spontaneous baroreflex during anesthesia.


METHODS
Thirty ASA class I patients scheduled for surgical hepatic and gastric tumor excisions were enrolled in this study. Spontaneous baroreflex sensitivity (SBR) during anesthesia was calculated by sequence analysis of beat-to-beat variations in systolic arterial pressure and R-R intervals. Data obtained from Finapres were compared with those from standard intra-arterial catheterization technique.


RESULTS
SBR values determined by non-invasive and invasive blood pressure measurement technique were precisely correlated (r = 0.96) and the mean difference was about 0.22 ms/mmHg (12.5%). However, the individual data might differ by -0.52 to +0.96 ms/mmHg (-35% to +60%).


CONCLUSIONS
Finapres may trace the changes of SBR during anesthesia and provides similar results as does invasive method but individual variation exists.
Huang
C L
CL
Department of Anesthesiology, National Taiwan University Hospital, Taipei, Taiwan, R.O.C.
Liu
C C
CC
Tseng
H C
HC
Wang
Y P
YP
Tsai
S K
SK
D000328:Adult; D000368:Aged; D000758:Anesthesia; D017704:Baroreflex / Q000502:physiology*; D001794:Blood Pressure / Q000187:drug effects; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010991:Plethysmography