HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Free Full Text (PDF) Free All Versions of this Article: 95/6/2223    most recent 00210.2003v1 Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (2) Citing Articles via Google Scholar Google Scholar Articles by de Graaff, J. C. Articles by Jacobs, M. J. H. M. Search for Related Content PubMed PubMed Citation Articles by de Graaff, J. C. Articles by Jacobs, M. J. H. M.

Postural changes in capillary pressure in the hallux of healthy volunteers

¹Department of Vascular Surgery, Academic Medical Center, University of Amsterdam, 1100 DE Amsterdam; ²Department of Anesthesiology and Intensive Care, St. Antonius Hospital, 3430 EM Nieuwegein; and ³Department of Surgery, University Hospital Maastricht, University of Maastricht, 6202 AZ Maastricht, The Netherlands

Submitted 27 February 2003 ; accepted in final form 23 June 2003

Capillary circulation is delicately regulated by microvascular constriction mechanisms, thereby controlling capillary perfusion and transmural pressure. The influence of posture on capillary flow has been investigated in both diseased and healthy people. However, its influence on capillary pressure has rarely been investigated. We measured capillary pressures in the supine and sitting positions in the hallux of healthy volunteers. The capillaries in the eponychium of the hallux were punctured by using a micropipette connected to a micropressure system (900A, WPI). Also, peripheral arterial and venous pressures were measured in both positions. The rise in systolic capillary pressure from supine to sitting position (32 mmHg; from 39 to 71 mmHg, respectively) was significantly (P < 0.001) smaller than the rise in systolic arterial toe pressure (57 mmHg, from 87 to 144 mmHg, respectively) and venous pressure (41 mmHg, from 26 mmHg to 67 mmHg, respectively). This study shows that the postural rise in precapillary arteriolar pressure is not completely transmitted to the capillaries, probably because of activation of peripheral vasoconstriction mechanisms.

microcirculation; capillaries; blood pressure; regional blood flow; vasoconstriction

This article has been cited by other articles:

				K. Okazaki, Q. Fu, E. R. Martini, R. Shook, C. Conner, R. Zhang, C. G. Crandall, and B. D. Levine Vasoconstriction during venous congestion: effects of venoarteriolar response, myogenic reflexes, and hemodynamics of changing perfusion pressure Am J Physiol Regulatory Integrative Comp Physiol, November 1, 2005; 289(5): R1354 - R1359. [Abstract] [Full Text] [PDF]