Received February 8, 2005
Revised February 18, 2005
Accepted after revision March 21, 2005

¹ University of Amsterdam

^* To whom correspondence should be addressed. E-mail: j.j.vanlieshout{at}amc.uva.nl.

	Abstract

We review recent developments in the methodology of non-invasive finger arterial pressure and the information about arterial flow that can be obtained from it. Continuous measurement of finger pressure based on the volume clamp method was introduced in the early 1980s both for research purposes and for clinical medicine. Finger pressure tracks intra-arterial pressure but the pressure waves may differ systematically both in shape and magnitude. Such bias can, at least partly, be circumvented by reconstruction of brachial from finger pressure by using a general inverse anti-resonance model correcting for the difference in pressure waveforms and an individual forearm cuff calibration. The Modelflow method as implemented in the Finometer computes an aortic flow waveform from peripheral arterial pressure by simulating a non-linear three-element model of the aortic input impedance. The methodology tracks fast changes in stroke volume (SV) during various experimental protocols including postural stress and exercise. If absolute values are required, calibration against a gold standard is needed. Otherwise, Modelflow SV is expressed as change from control with the same precision in tracking. Beat-to-beat information on arterial flow offers important and clinically relevant information on the circulation beyond what can be detected by arterial pressure.

Key Words: Circulation, Human, Methodology

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