Boulos Nassar1, Gur Raj S Deol1, Andrew Ashby1, Nicole Collett1, Gregory A Schmidt2. 1. Division of Pulmonary Diseases, Critical Care, and Occupational Medicine, Department of Internal Medicine, University of Iowa, Iowa City, IA. 2. Division of Pulmonary Diseases, Critical Care, and Occupational Medicine, Department of Internal Medicine, University of Iowa, Iowa City, IA. Electronic address: Gregory-a-schmidt@uiowa.edu.
Abstract
BACKGROUND: The Trendelenburg position is used to distend the central veins, improving both the success and safety of vascular cannulation. The purpose of this study was to measure the cross-sectional area (CSA) of the internal jugular vein (IJV) in three different positions using surface ultrasonography. METHODS: Fifty-one subjects were enrolled. A Sono Site Titan 180 or M-Turbo portable ultrasound machine with a 10.5-mHz broadband linear surface probe was used. We measured the CSA of the IJV (at end-expiration at the level of the cricoid cartilage) in three positions: 15° reverse Trendelenburg, supine, and 15° Trendelenburg. RESULTS: The mean CSA at 15° reverse Trendelenburg was 0.83 cm2 (SD, 0.86), in the supine position it was 1.25 cm2 (SD, 0.98), and at -15° Trendelenburg it was 1.47 cm2 (SD, 1.03). Moving from reverse Trendelenburg to supine, the CSA increased by 50%. In contrast, lowering the head to a Trendelenburg position increased the mean CSA by only 17%. Surprisingly, Trendelenburg positioning reduced the CSA in nine of the 51 subjects. CONCLUSIONS: Trendelenburg positioning augments the CSA only modestly, on average, compared with the supine position, and in some patients it reduces the CSA. TRIAL REGISTRATION: ClinicalTrials.gov; No.: NCT01099254; URL: www.clinicaltrials.gov.
BACKGROUND: The Trendelenburg position is used to distend the central veins, improving both the success and safety of vascular cannulation. The purpose of this study was to measure the cross-sectional area (CSA) of the internal jugular vein (IJV) in three different positions using surface ultrasonography. METHODS: Fifty-one subjects were enrolled. A Sono Site Titan 180 or M-Turbo portable ultrasound machine with a 10.5-mHz broadband linear surface probe was used. We measured the CSA of the IJV (at end-expiration at the level of the cricoid cartilage) in three positions: 15° reverse Trendelenburg, supine, and 15° Trendelenburg. RESULTS: The mean CSA at 15° reverse Trendelenburg was 0.83 cm2 (SD, 0.86), in the supine position it was 1.25 cm2 (SD, 0.98), and at -15° Trendelenburg it was 1.47 cm2 (SD, 1.03). Moving from reverse Trendelenburg to supine, the CSA increased by 50%. In contrast, lowering the head to a Trendelenburg position increased the mean CSA by only 17%. Surprisingly, Trendelenburg positioning reduced the CSA in nine of the 51 subjects. CONCLUSIONS: Trendelenburg positioning augments the CSA only modestly, on average, compared with the supine position, and in some patients it reduces the CSA. TRIAL REGISTRATION: ClinicalTrials.gov; No.: NCT01099254; URL: www.clinicaltrials.gov.
Authors: Jeong Gil Lee; Hee Bin Park; Hye Young Shin; Ju Deok Kim; Soo Bong Yu; Doo Sik Kim; Sie Jeong Ryu; Gyeong Han Kim Journal: Korean J Anesthesiol Date: 2014-11-26
Authors: Ke Chen; Lizhen Wang; Qing Wang; Xuesheng Liu; Yao Lu; Yuanhai Li; Gordon Tin Chun Wong Journal: Medicine (Baltimore) Date: 2019-05 Impact factor: 1.817