Figure 2

Diagram displaying the measurements obtained from the left ventricular cross-sectional area ( α _LV ) time curve on the top: i) duration of diastole ( τ _dia = dashed), ii) duration of systole ( τ _sys = dotted), iii) diastolic left ventricular cross-sectional area, α _LV ( dia ), and iv) systolic left ventricular cross-sectional area, α _LV ( sys ), and v) the resulting α _LV ( t2 )^- on the descending systolic branch, and vi) α _LV ( t2 )⁺ on the ascending diastolic branch of the left ventricular cross-sectional area time curve.

On the bottom of the figure the measurements for the wave amplitude time curve are displayed: i) diastolic level of the wave amplitude U(dia), ii) systolic level of the wave amplitude U(sys), and the resulting iii) U(t1)^- on the descending branch and iv) U(t1)⁺ on the ascending branch of the wave amplitude time curve.

Isovolumetric tension time τ _A and isovolumetric elasticity relaxation τ _B are shown in the middle.