Impact of body tilt on the central aortic pressure pulse.
Détails
Etat: Public
Version: Final published version
ID Serval
serval:BIB_69D7F9DA0036
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Impact of body tilt on the central aortic pressure pulse.
Périodique
Physiological Reports
ISSN
2051-817X (Electronic)
ISSN-L
2051-817X
Statut éditorial
Publié
Date de publication
2015
Peer-reviewed
Oui
Volume
3
Numéro
4
Pages
-
Langue
anglais
Résumé
The present work was undertaken to investigate, in young healthy volunteers, the relationships between the forward propagation times of arterial pressure waves and the timing of reflected waves observable on the aortic pulse, in the course of rapid changes in body position. 20 young healthy subjects, 10 men, and 10 women, were examined on a tilt table at two different tilt angles, -10° (Head-down) and + 45° (Head-up). In each position, carotid-femoral (Tcf) and carotid-tibial forward propagation times (Tct) were measured with the Complior device. In each position also, the central aortic pressure pulse was recorded with radial tonometry, using the SphygmoCor device and a generalized transfer function, so as to evaluate the timing of reflected waves reaching the aorta in systole (onset of systolic reflected wave, sT1r) and diastole (mean transit time of diastolic reflected wave, dMTT). The position shift from Head-up to Head-down caused a massive increase in both Tct (women from 130 ± 10 to 185 ± 18 msec P < 0.001, men from 136 ± 9 to 204 ± 18 msec P < 0.001) and dMTT (women from 364 ± 35 to 499 ± 33 msec P < 0.001, men from 406 ± 22 to 553 ± 21 msec P < 0.001). Mixed model regression showed that the changes in Tct and dMTT observed between Head-up and Head-down were tightly coupled (regression coefficient 2.1, 95% confidence interval 1.9-2.3, P < 0.001). These results strongly suggest that the diastolic waves observed on central aortic pulses reconstructed from radial tonometric correspond at least in part to reflections generated in the lower limbs.
Pubmed
Open Access
Oui
Création de la notice
07/12/2015 17:22
Dernière modification de la notice
20/08/2019 15:24