Document Detail

Influence of temperature on the distribution of blood in humans as assessed by electrical impedance.
MedLine Citation:
PMID:  10751107     Owner:  NLM     Status:  MEDLINE    
This study investigated whether ambient temperature influences the distribution of blood as indicated by electrical impedance. In ten supine humans, the room temperature was raised from 14 to 35 degrees C. Skin temperature and blood flow on the thorax increased by 3.6 (SD 0.3) degrees C and 84 (SD 40)%, respectively, and by 9.8 (SD 1) degrees C and 115 (SD 45)%, respectively, on the extremities (P < 0.05). Cardiac output remained unchanged, ear temperature and heart rate became elevated, and the oesophageal temperature and mean arterial pressure decreased (P < 0.05). At five discrete frequencies (1.5. 5, 50, 100, 200 kHz) thoracic impedance was increased by 1.2 (SD 1) to 1.5 (SD 1) omega (P < 0.05). In contrast, total body impedance was reduced by 16.4 (SD 5) omega and leg impedance was reduced by 4.0 (SD 2) omega, while an index of intracellular water within the thorax (the difference between the admittances at 100 kHz and 1.5 kHz) was decreased by 10 (SD 1) x 10(-4)S (P < 0.05). The results would suggest that total body impedance is dominated by the impedance of the extremities. The increase in thoracic impedance and a decrease in leg impedance (as in total body impedance) could be explained by a redistribution of blood from the thorax to the extremities during heating. Such a translocation of blood was confirmed by a reduced impedance based index of intracellular water within the thorax.
Y Cai; M Jenstrup; K Ide; M Perko; N H Secher
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European journal of applied physiology     Volume:  81     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2000 Mar 
Date Detail:
Created Date:  2000-05-10     Completed Date:  2000-05-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  443-8     Citation Subset:  IM    
Department of Anaesthesia, Rigshospitalet 2041, University of Copenhagen, Denmark.
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MeSH Terms
Blood Pressure / physiology
Body Fluid Compartments / physiology
Body Temperature / physiology
Cardiac Output / physiology
Ear / physiology
Electric Impedance*
Esophagus / physiology
Heart Rate / physiology
Regional Blood Flow / physiology*
Skin / blood supply
Stroke Volume / physiology
Supine Position / physiology

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

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