Final answer:
LV outflow velocity measures heart function and is determined using an echocardiogram to calculate stroke volume (SV), which informs the ejection fraction. For clinical purposes, flow rate is often reported in liters per minute, though the standard SI unit is cubic meters per second.
Step-by-step explanation:
The measurement of Left Ventricular (LV) outflow velocity is critical in evaluating heart function and is commonly done using an echocardiogram. Stroke volume (SV) is a pivotal parameter that can be measured on an echocardiogram by recording the End-Diastolic Volume (EDV) and End-Systolic Volume (ESV) and calculating their difference (SV = EDV - ESV). SV measurements are used to calculate additional important cardiac indices such as ejection fraction, which is the portion of blood ejected from the heart with each contraction, expressed as a percentage of EDV.
For a more invasive and risky procedure, SV can also be measured using a specialized catheter. SVs are important for calculating ejection fractions, which typically range from 55-70 percent. Additionally, the flow rate of the heart, which indicates the volume of blood pumped over time, is usually measured in liters per minute (L/min) for clinical convenience, even though the SI unit for flow rate is m³/s.