Dynamic variation of the axillary veins due to intrathoracic pressure changes: A prospective sonographic study. Issue 1 (January 2020)

• Record Type: Journal Article
• Authors: Tufegdzic, Boris; Khozenko, Andrey; Lee St John, Terrence; Spencer, Timothy R; Lamperti, Massimo
• Is Part Of: Journal of vascular access. Volume 21:Issue 1(2020)
• Page Start: 66
• Page End: 72
• Publication Date: 2020-01
• Subjects: Axillary vein -- vessel diameter -- cross-sectional area -- central venous -- catheterization -- intrathoracic pressure -- ultrasound; Arterial catheterization -- Periodicals; Intravenous catheterization -- Periodicals; 612.13
• DOI: 10.1177/1129729819852204
• Languages: English
• ISSNs: 1129-7298

Abstract

Introduction: The ultrasound-guided axillary vein is becoming a compulsory alternative vessel for central venous catheterization and the anatomical position offers several potential advantages over blind, subclavian vein techniques. Objective: To determine the degree of dynamic variation of the axillary vein size measured by ultrasound prior to the induction of general anesthesia and after starting controlled mechanical ventilation. Design: Prospective, observational study. Methods: One hundred ten patients undergoing elective surgery were enrolled and classified according to sex, age, and body mass index. Two-dimensional cross-sectional vein diameter, area, and mean flow velocity were performed using ultrasound on both the left and right axillary veins of each subject before and after induction of anesthesia. Results: There was statistically significant evidence showing that the axillary vein area increases when patients are mechanically ventilated. When considering venous flow velocity as a primary outcome, velocity decreased after patients moved from spontaneous to mechanical ventilation (coefficient = −0.267), but this relationship failed to achieve statistical significance ( t = –1.355, p = 0.179). Conclusions: Anatomical variations in depth and diameter as well as the collapsibility due to intrathoracic pressures changes represent common challenges that face clinicians during central venous catheterization of the axillary vein. A noteworthy increase in vessel size as patients transition from spontaneous to mechanical ventilation may theoretically improve first-pass cannulation success with practitioners skilled in both ultrasound and procedure. As a result, placing a centrally inserted central catheter after the induction of anesthesia may be beneficial.