Why are mitral annular velocities e' and a' measured, and how do they contribute to E/e' calculation?

• A. They reflect systolic annular motion; e' is used with E to estimate LV pressure.
• B. They reflect diastolic annular motion; e' is used with E to estimate LV filling pressures via E/e'.
• C. They determine aortic flow.
• D. They measure right ventricular function.

Answer: (B)