|Title||The Finometer can function as a standalone instrument in blood pressure variability studies and does not require support equipment to determine breathing frequency|
|Authors||Mcmullen, M., Whitehouse, J., Shine, G., Towell, A. and Rhodes, G.|
Objective: The Finometer (FMS, Finapres Measurement Systems, Amsterdam) records the
beat-to-beat finger pulse contour and has been recommended for research studies assessing shortterm
changes of blood pressure and its variability. Variability measured in the frequency domain using
spectral analysis requires that the impact of breathing be restricted to high frequency spectra (> 0.15
Hz) so data from participants needs to be excluded when the breathing impact occurs in the low
frequency spectra (0.04 - 0.15 Hz). This study tested whether breathing frequency can be estimated
from standard Finometer recordings using either stroke volume oscillation frequency or spectral
stroke volume variability maximum scores.
Methods: 22 healthy volunteers were tested for 270s in the supine and upright positions. Finometer
recorded the finger pulse contour and a respiratory transducer recorded breathing. Stoke volume
oscillation frequency was calculated manually while the stroke volume spectral maximums were
obtained using the software Cardiovascular Parameter Analysis (Nevrokard Kiauta, Izola, Slovenia).
These estimates were compared to the breathing frequency using the Bland-Altman procedures.
Results: Stroke volume oscillation frequency estimated breathing frequency to <±10% 95% levels of
agreement in both supine (-7.7 to 7.0%) and upright (-6.7 to 5.4%) postures. Stroke volume variability
maximum scores did not accurately estimate breathing frequency.
Conclusions: Breathing frequency can be accurately derived from standard Finometer recordings
using stroke volume oscillations for healthy individuals in both supine and upright postures. The
Finometer can function as a standalone instrument in blood pressure variability studies and does not
require support equipment to determine breathing frequency.
|Keywords||Breathing frequency, Finometer, blood pressure variability, stroke volume variability, stroke volume oscillation, heart rate variability, baroreceptor sensitivity.|
|Journal||Blood Pressure Monitoring|
|Journal citation||15 (4), pp. 220-4|
|Publisher||Lippincott Williams & Wilkins|
|Digital Object Identifier (DOI)||doi:10.1097/MBP.0b013e328339e198|