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Noninvasive assessment of central and peripheral arterial pressure (waveforms): implications of calibration methods

Mahieu, Driesa; Kips, Jana; Rietzschel, Ernst Rb; De Buyzere, Marc Lb; Verbeke, Francisc; Gillebert, Thierry Cb; De Backer, Guy Gd; De Bacquer, Dirkd; Verdonck, Pascale; Van Bortel, Luc Ma; Segers, Patrickeon behalf of the Asklepios investigators

doi: 10.1097/HJH.0b013e3283340a1a
Original papers: Blood vessels
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Objectives Noninvasive estimation of central blood pressure (BP) from radial artery pressure waveforms is increasingly applied. We investigated the impact of radial artery waveform calibration on central BP assessment and calculated pressure amplification, with focus on the one-third rule used to estimate mean arterial BP (MAP).

Methods Pressure waveforms were noninvasively measured at the radial and carotid arteries in 1873 individuals (age 45.8±6.1 years). Radial and carotid artery waveforms were calibrated using brachial artery DBP and SBP, MAP estimated with the one-third rule and MAP estimated as brachial DBP along with 40% of brachial artery pulse pressure.

Results Central SBP obtained via a transfer function was 123.5 ± 15.7, 117.8 ± 14.2 and 126.0 ± 15.4 mmHg (mean ± SD) following above-mentioned three calibration schemes, respectively. Using the same calibration schemes, carotid artery SBP was 131.4 ± 15.2, 118.4 ± 14.4 and 126.8 ± 15.7 mmHg, respectively. Central-to-brachial amplification was 13.0 ± 3.6 mmHg using second method as compared with 4.6 ± 3.8 mmHg with third method. Brachial-to-radial amplification was actually negative (−6.3 ± 4.5 mmHg) using second method, whereas 3.4 ± 5.5 mmHg was found with third method.

Conclusion Both carotid artery SBP and central SBP obtained via a transfer function are highly sensitive to the calibration of the respective carotid artery and radial artery pressure waveforms. Our data suggest that the one-third rule to calculate MAP from brachial cuff BP should be avoided, especially when used to calibrate radial artery pressure waveforms for subsequent application of a pressure transfer function. Until more precise estimation methods become available, it is advisable to use 40% of brachial pulse pressure instead of 33% to assess MAP.

aDepartment of Pharmacology, Belgium

bDepartment of Cardiovascular Diseases, Belgium

cDepartment of Nephrology, Belgium

dDepartment of Public Health, Ghent University Hospital, Belgium

eInstitute Biomedical Technology, Ghent University, Ghent, Belgium

Received 15 October, 2008

Revised 12 August, 2009

Accepted 9 October, 2009

Correspondence to Dries Mahieu, Department of Pharmacology, Ghent University Hospital, Ghent, Belgium Tel: +32 9 332 0034; fax: +32 9 332 4988; e-mail: dries.mahieu@ugent.be

© 2010 Lippincott Williams & Wilkins, Inc.