There are multiple definitions:
rhenium(English)
Reynolds number(English)
- the ratio of inertial forces to viscous forces
- PWV, VFR
- Hemodynamics, Ratio-based metric
- https://doi.org…-319-77932-4_14
rate of ejection(English)
- calculated as the ratio of stroke volume and duration of ejection derived from the number of frames separating the opening and closing movement of aortic leaflets, and expressed as mL.s/m2
- LVEDV, HR, LVEDP, LVEF, VCF, Vvr
- Cardiology, Woman /female, Ratio-based metric
- https://doi.org…rheartj.a061347