Figure 4
Examples of strain and strain rate curves of the right ventricle free wall segments. Each right ventricle free wall segment (basal, mid and apex) is represented with a curve (black curve = mean value). Examples of strain and strain rate curves at baseline positive end-expiratory pressure (PEEP 0 cmH2O) and at maximal PEEP represented. At higher levels of PEEP both RV systolic function parameters (RV free wall Strain [RVfwS] and RV free wall Strain Rate [RVfwSR]) as well as RV diastolic function parameters (RV free wall Strain Rate early relaxation [RVfwSRe]) showed deterioration. Time To Peak strain (TTP) indicates delay in time from first segment to reach maximal strain value to last segment to reach maximal strain value. TTP can be used to determine dyssynchrony of segmental contraction.