So, you’ve figured out how to assess the LVEF visually, but that’s not the only piece to consider in LV systolic function. How much blood is ACTUALLY coming out of the LV during each contraction? Yep, echo can do that too!!! Dr. Murthi talks about how to measure the VTI (velocity-time integral) and how to use it to calculate (SV) stroke volume.
Okay, we need to nerd out for a bit and talk about hemodynamics (you’ll survive, we promise). Dr. Murthi explains why VTI can be used a surrogate for SV, and why we should really be talking about VTI and SV and not cardiac output.
KEY LEARNING POINTS:
SVÂ is calculated through measurements of LVOT diameter (PSL), and VTI (A5C)
VTI can be used a surrogate for stroke volume (18-22cm normal)
VTI and SV gives you much more specific information about LV function than cardiac output/index.
