Cardiovascular changes induced by cold water immersion during hyperbaric hyperoxic exposure.

Abstract : The present study was designed to assess the cardiac changes induced by cold water immersion compared with dry conditions during a prolonged hyperbaric and hyperoxic exposure (ambient pressure between 1.6 and 3 ATA and PiO(2) between 1.2 and 2.8 ATA). Ten healthy volunteers were studied during a 6 h compression in a hyperbaric chamber with immersion up to the neck in cold water while wearing wet suits. Results were compared with measurements obtained in dry conditions. Echocardiography and Doppler examinations were performed after 15 min and 5 h. Stroke volume, left atrial and left ventricular (LV) diameters remained unchanged during immersion, whereas they significantly fell during the dry session. As an index of LV contractility, percentage fractional shortening remained unchanged, in contrast to a decrease during dry experiment. Heart rate (HR) significantly decreased after 5 h, although it had not changed during the dry session. The changes in the total arterial compliance were similar during the immersed and dry sessions, with a significant decrease after 5 h. In immersed and dry conditions, cardiac output was unchanged after 15 min but decreased by almost 20% after 5 h. This decrease was related to a decrease in HR during immersion and to a decrease in stroke volume in dry conditions. The hydrostatic pressure exerted by water immersion on the systemic vessels could explain these differences. Indeed, the redistribution of blood volume towards the compliant thoracic bed may conceal a part of hypovolaemia that developed in the course of the session.
Type de document :
Article dans une revue
Clinical Physiology and Functional Imaging, Wiley-Blackwell, 2007, 27 (5), pp.268-74. 〈10.1111/j.1475-097X.2007.00747.x〉
Liste complète des métadonnées

https://hal-ssa.archives-ouvertes.fr/ssa-00194919
Contributeur : Mathilde Himgi <>
Soumis le : vendredi 7 décembre 2007 - 16:29:06
Dernière modification le : lundi 9 juillet 2018 - 13:14:01
Document(s) archivé(s) le : lundi 27 juin 2011 - 17:39:55

Fichiers

Hyperbaric_Hyperoxia_ClinPhysi...
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

Alain Boussuges, Florence Molenat, Aliocha Grandfond, Jacques Regnard, Jean-Pierre Wolf, et al.. Cardiovascular changes induced by cold water immersion during hyperbaric hyperoxic exposure.. Clinical Physiology and Functional Imaging, Wiley-Blackwell, 2007, 27 (5), pp.268-74. 〈10.1111/j.1475-097X.2007.00747.x〉. 〈ssa-00194919〉

Partager

Métriques

Consultations de la notice

271

Téléchargements de fichiers

271