Identification Of The Dynamic Component Of The
Finger Arterial Pressure-volume Relationship
Author(s)
J. Talts, R. Raamat & K. Jagomägi
Abstract
Similar to most biological tissues, the arterial wall has both elastic and viscous
properties. This is the reason why recordings of the pressure-volume (P-V)
characteristics show a shape of hysteresis loops and are different for static and
dynamic measurements. The exact model of the viscoelastic P-V relationship
would be complicated, containing several sections with potentially nonlinear
properties. The volume changes, in the simplest arrangement, can be viewed as a
sum of fast and slower components.
We propose a method to identify the fast (dynamic) component of the
nonlinear P-V relationship. Continuous finger blood pressure is measured by
applying the Finapres monitor, while volume pulses at a controlled cuff pressure
are recorded by the transmittance mode photoplethysmograph. The nonlinear
relationship is modelled by five parameters. The identification is based on the
fitting of parameters of the P-V relationship to obtain maximum similarity
between the filtered waveforms of the modelled and measured volume signals.
The method was tested on 9 normal subjects. The results show that the applied
algorithm can be used even in case of remarkable viscous creep effects.
Keywords: modelling, system identification, pressure-volume relationship,
arterial compliance, blood pressure, photoplethysmography.
1 Introduction
Peripheral circulation is strongly influenced by the peripheral resistance and
compliance. According to the definition, peripheral compliance is equal to the
slope of the peripheral pressure-volume (P-V) relationship and can be expressed
as C=dV/dP. In general, this relationship is nonlinear, and this nonlinear nature
of the arterial mechanical relationship results in appearance of a maximum
Keywords
modelling, system identification, pressure-volume relationship,
arterial compliance, blood pressure, photoplethysmography.
Related Book
Other papers in this volume
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