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European Heart Journal 1993 14(2):160-167;
Copyright © 1993 by the European Society of Cardiology.
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© 1993 The European Society of Cardiology

An analysis of the relationship between central aortic and peripheral upper limb pressure waves in man

M. KARAMANOGLU*, M. F. O'ROURKE{dagger},, A. P. AVOLIO* and R. P. KELLY{dagger}

*Centre for Biomedical Engineering, University of New South Wales Sydney, Australia
{dagger}Medical Professorial Unit and Cardiology Department, St Vincent's Hospital Sydney, Australia

Received 13 December 1991; revised 29 May 1992; .

Correspondence. Michael O'Rourke. MD. Medical Professorial Unit. University of New South Wales, St Vincent's Hospital, Victoria Street, Sydney. New South Wales, 2010. Australia

Abstract

Amplification of the pressure pulse between central and peripheral arteries renders pressure values in the upper limb an inaccurate measure of ascending aortic (AA) pressure. Accuracy could be improved by allowance for such amplification.

Transfer functions (TF) for pressures between AA and brachial artery (BA): (BATF) and between AA and radial artery (RA): (RATF) were derived from high-fidelity pressure recordings obtained at cardiac catheterization in 14 patients under control conditions, and after sublingual nitroglycerine 0.3 mg. There was no significant difference in BATF under control conditions and with nitroglycerine; hence results were pooled. Control and nitroglycerine results were also pooled to obtain a single RATF. BATF and RATF moduli peaked at 5 Hz and 4 Hz, reaching 2.5 and 2.8 times the value at zero frequency respectively. Frequency-dependent changes in modulus and phase of BATF and RATF were attributable to wave travel and reflection in the upper limb. BATF and RATF were compared to published transfer functions and those derived from analysis of aortic and brachial or radial pressure waves in previous publications. Results were similar. Our BATF and RATF were used to synthesize AA pressure waves from published peripheral pulses. Correspondence was close, especially for systolic pressure which d by 2.4 ± 1.0 (mean ± SEM) mmHg, whereas recorded systolic pressure differed by 20.4 ± 2.6 (mean ± SEM) mmHg between central and peripheral sites.

Results indicate that in adult humans a single generalized TF can be used with acceptable accuracy to determine central from peripheral pressure under different conditions. While this process is capable of refinement, it represents an advance on the present practice of assuming that central and peripheral pressures are identical.

Key Words: Transfer function • wave reflection • wave transmission • blood pressure


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