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J Appl Physiol (October 4, 2002). doi:10.1152/japplphysiol.00823.2002
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Articles in PresS, published online ahead of print October 4, 2002
J Appl Physiol, 10.1152/jap.00823.2002
Submitted on September 10, 2002
Accepted on September 26, 2002

Shear stress depends on vascular territory in healthy subjects: comparison between common carotid and brachial artery

Ruben Dammers1*, Frank Stifft1, Jan H Tordoir1, Jeroen M Hameleers2, Arnold P Hoeks2, and Peter J Kitslaar1

1 Department of Surgery, University Hospital Maastricht, Maastricht, Limburg, The Netherlands
2 Department of Biophysics, University of Maastricht, Maastricht, Limburg, The Netherlands

* To whom correspondence should be addressed. E-mail: r.dammers{at}bf.unimaas.nl.

Shear stress (SS) is thought to be constant throughout the vascular system. Evidence for this supposition is scarce, however. To verify this hypothesis in vivo we assessed common carotid (CCA) and brachial artery (BA) peak and mean wall shear rate (SR) non-invasively in ten healthy volunteers (23.7 ± 3.4 years) with an ultrasound SR estimation system. SS was estimated from SR and calculated whole blood viscosity (WBV). SR was higher (p < 0.05) in the CCA (mean: 359 ± 111 s-1; peak: 1047 ± 345 s-1) than in the BA (mean: 95 ± 24 s-1; peak: 770 ± 170 s-1). WBV was higher in the BA compared to the WBV in the CCA (5.1 ± 0.7 vs 3.3 ± 0.6 mPa.s; p < 0.001). Peak SS did not differ between the CCA and the BA, whereas mean SS was significantly higher in the CCA (1.15 ± 0.21 Pa) than in the BA (0.48 ± 0.15 Pa; p < 0.001). These results demonstrate that BA SS strongly deviates from CCA SS in vivo.






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