![]() The assumption is that the LVOT is constant and doesn't change in most circumstances a change of VTI that is greater than 15% suggests that the patient is VR The authors claim that VR can further be simplified by not measuring the left ventricular outflow tract (LVOT) and only comparing changes in the velocity-time integral (VTI).Click here for a video on how to calculate the stroke volume (skip to 21:30 in the video) VR has classically been assessed by determining the stroke volume before and after a passive leg raise or a fluid bolus.The RUSH exam does not include an assessment of volume responsiveness (VR), but a new article by Blaivas, Aguiar, and Blanco suggests that it should be. ![]()
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