| Effect of position and weight force on inferior vena cava diameter - Implications for arrest-related death. | |
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MedLine Citation:
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PMID: 21798678 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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INTRODUCTION: The physiology of many sudden, unexpected arrest-related deaths (ARDs) proximate to restraint has not been elucidated. A sudden decrease in central venous return during restraint procedures could be physiologically detrimental. The impact of body position and applied weight force on central venous return has not been previously studied. In this study, we use ultrasound to measure the size of the inferior vena cava (IVC) as a surrogate of central venous return in the standing position, prone position, and with weight force applied to the thorax in the prone position. METHODS: This was a prospective, observational study of volunteer human subjects. The IVC was visualized from the abdomen in both the longitudinal and transverse section in the standing and prone positions without weight force applied, and with 100lbs (45kg) and 147lbs (67kg) of weight force on the upper back in the prone position. Maximum and minimum measurements were determined in each section to account for possible respiratory variation of the IVC. RESULTS: The IVC significantly decreased in size with each successive change: from standing to prone, from prone to prone with 100lbs (45kg) weight compression, from prone with 100lbs (45kg) weight compression to prone with 147lbs (67kg) weight compression (p<0.0001). The vital sign measurements had no statistical change. CONCLUSIONS: The physiology involved in many sudden, unexpected ARDs has not been elucidated. However, in our study, we found a significant decrease in IVC diameter with weight force compression to the upper thorax when the subject was in the prone position. This may have implications for the tactics of restraint to aid in the prevention of sudden, unexpected ARD cases. |
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Authors:
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Jeffrey D Ho; Donald M Dawes; Johanna C Moore; Liberty V Caroon; James R Miner |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-7-26 |
Journal Detail:
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Title: Forensic science international Volume: - ISSN: 1872-6283 ISO Abbreviation: - Publication Date: 2011 Jul |
Date Detail:
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Created Date: 2011-7-29 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7902034 Medline TA: Forensic Sci Int Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Elsevier Ireland Ltd. All rights reserved. |
Affiliation:
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Department of Emergency Medicine, Hennepin County Medical Center, 701 Park Avenue South, Minneapolis, MN 55415, United States; Meeker County Sheriff's Office, 326 N. Ramsey Avenue, Litchfield, MN 55355, United States. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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