Document Detail


Effects of head and body cooling on hemodynamics during immersed prone exercise at 1 ATA.
MedLine Citation:
PMID:  19023017     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Immersion pulmonary edema (IPE) is a condition with sudden onset in divers and swimmers suspected to be due to pulmonary arterial or venous hypertension induced by exercise in cold water, although it does occur even with adequate thermal protection. We tested the hypothesis that cold head immersion could facilitate IPE via a reflex rise in pulmonary vascular pressure due solely to cooling of the head. Ten volunteers were instrumented with ECG and radial and pulmonary artery catheters and studied at 1 atm absolute (ATA) during dry and immersed rest and exercise in thermoneutral (29-31 degrees C) and cold (18-20 degrees C) water. A head tent varied the temperature of the water surrounding the head independently of the trunk and limbs. Heart rate, Fick cardiac output (CO), mean arterial pressure (MAP), mean pulmonary artery pressure (MPAP), pulmonary artery wedge pressure (PAWP), and central venous pressure (CVP) were measured. MPAP, PAWP, and CO were significantly higher in cold pool water (P < or = 0.004). Resting MPAP and PAWP values (means +/- SD) were 20 +/- 2.9/13 +/- 3.9 (cold body/cold head), 21 +/- 3.1/14 +/- 5.2 (cold/warm), 14 +/- 1.5/10 +/- 2.2 (warm/warm), and 15 +/- 1.6/10 +/- 2.6 mmHg (warm/cold). Exercise values were higher; cold body immersion augmented the rise in MPAP during exercise. MAP increased during immersion, especially in cold water (P < 0.0001). Except for a transient additive effect on MAP and MPAP during rapid head cooling, cold water on the head had no effect on vascular pressures. The results support a hemodynamic cause for IPE mediated in part by cooling of the trunk and extremities. This does not support the use of increased head insulation to prevent IPE.
Authors:
T E Wester; A D Cherry; N W Pollock; J J Freiberger; M J Natoli; E A Schinazi; P O Doar; A E Boso; E L Alford; A J Walker; D M Uguccioni; D Kernagis; R E Moon
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-11-20
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  106     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2009 Feb 
Date Detail:
Created Date:  2009-02-06     Completed Date:  2009-03-12     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  691-700     Citation Subset:  IM    
Affiliation:
Department of Anesthesiology, Duke University Medical Center, Durham, NC 27710, USA.
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MeSH Terms
Descriptor/Qualifier:
Adult
Atmospheric Pressure
Body Temperature Regulation*
Carbon Dioxide / blood
Cardiac Output
Central Venous Pressure
Cold Temperature*
Diving / adverse effects*
Exercise*
Extremities
Female
Head
Heart Rate
Hemodynamics*
Humans
Immersion*
Male
Middle Aged
Oxygen / blood
Pulmonary Circulation
Pulmonary Edema / blood,  etiology*,  physiopathology
Pulmonary Wedge Pressure
Respiration
Water*
Young Adult
Chemical
Reg. No./Substance:
124-38-9/Carbon Dioxide; 7732-18-5/Water; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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