| Ultrasonographic finding of internal jugular vein during anti-G straining maneuver: is it associated with gravity-induced loss of consciousness? | |
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MedLine Citation:
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PMID: 20186423 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Gravity-induced loss of consciousness (G-LOC) is caused by loss of cerebral blood flow during high +Gz (head-to-foot inertial forces). The resistance of the jugular vein is a significant factor in decrease in cerebral blood flow. Ultrasonography of thoracic inlet veins, including internal jugular vein, is feasible to visualize the internal jugular vein and hemodynamic information. Anti-gravity straining maneuver (AGSM) was widely recognized as one of the important factors in preventing G-LOC. The purpose of this study was to evaluate the relationship between the ultrasonographic shape and size of internal jugular vein during AGSM and G-LOC. 47 trainee pilots who participated in human centrifuge education program were enrolled. They were all men, and their mean age was 23.9 +/- 1.38 years. Questionnaire sheets were used to collect information about well-being sensation, smoking, drinking, height, and weight. Using ultrasonography, we monitored shape and size of internal jugular vein during AGSM. After ultrasonographic examination, 47 subjects underwent human centrifuge on the same day. The protocol of human centrifuge training was maximal 6G with sustaining time of 30 s. G-LOC occurred to ten out of 47 subjects in human centrifuge. To find presumptive variable associated with G-LOC, we performed logistic regression analysis. Concave contour and smaller cross-sectional area of internal jugular vein during AGSM were associated with G-LOC. |
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Authors:
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Hyun Seok Choi; Jin Gon Sul; Kyung Sik Yi; Jeong-Min Seo; Ki Young Chung |
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Publication Detail:
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Type: Journal Article Date: 2010-02-26 |
Journal Detail:
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Title: European journal of applied physiology Volume: 109 ISSN: 1439-6327 ISO Abbreviation: Eur. J. Appl. Physiol. Publication Date: 2010 Jul |
Date Detail:
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Created Date: 2010-06-14 Completed Date: 2010-09-20 Revised Date: 2011-01-18 |
Medline Journal Info:
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Nlm Unique ID: 100954790 Medline TA: Eur J Appl Physiol Country: Germany |
Other Details:
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Languages: eng Pagination: 625-30 Citation Subset: IM |
Affiliation:
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Department of Radiology, Yonsei University College of Medicine, 250 Seongsanno, Seodaemun-gu, Seoul 120-752, Korea. hschoi2@yuhs.ac |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aviation Centrifugation Cerebrovascular Circulation Gravity, Altered* Humans Jugular Veins / physiopathology, ultrasonography* Logistic Models Male Republic of Korea Respiratory Mechanics* Risk Assessment Risk Factors Unconsciousness / etiology*, physiopathology, ultrasonography Vascular Resistance Young Adult |
| Comments/Corrections | |
Comment In:
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Eur J Appl Physiol. 2011 Jan;111(1):161-2
[PMID:
20838805
]
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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