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The Trendelenburg position is used to distend the central veins, improving both success and safety of vascular cannulation. The purpose of this study is to measure the cross-sectional area of the internal jugular vein (IJV) in three different positions, using surface ultrasound.
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| Measure | Description | Time Frame |
|---|---|---|
| Effect of trendelenburg and reverse trendelenburg position on the cross sectional area of the internal jugular vein | There will be substantial anatomic variation in venous size. Further, Trendelenburg positioning will have little impact on venous cross-sectional area in most subjects when compared with supine. | At time of data collection: physiologic study |
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Inclusion Criteria:
Exclusion Criteria:
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Patients admitted to Intensive care unit.
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| Name | Affiliation | Role |
|---|---|---|
| Gregory A Schmidt, mD | Roy J. & Lucille A. Carver College of Medicine, University of Iowa | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| University of Iowa | Iowa City | Iowa | 52246 | United States |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 7214938 | Background | Bazaral M, Harlan S. Ultrasonographic anatomy of the internal jugular vein relevant to percutaneous cannulation. Crit Care Med. 1981 Apr;9(4):307-10. doi: 10.1097/00003246-198104000-00004. | |
| 17060544 | Background | Vinayak AG, Levitt J, Gehlbach B, Pohlman AS, Hall JB, Kress JP. Usefulness of the external jugular vein examination in detecting abnormal central venous pressure in critically ill patients. Arch Intern Med. 2006 Oct 23;166(19):2132-7. doi: 10.1001/archinte.166.19.2132. |
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| 23392444 | Derived | Nassar B, Deol GRS, Ashby A, Collett N, Schmidt GA. Trendelenburg position does not increase cross-sectional area of the internal jugular vein predictably. Chest. 2013 Jul;144(1):177-182. doi: 10.1378/chest.11-2462. |