Click on image to view larger version.
Figure 2 Circumferential Strain Over Time, PAH Patient
Circumferential strain curves over time after the electrocardiographic R-wave for the left ventricular (LV) and right ventricular (RV) free walls and the septum for 1 patient at basal level. The LV, RV, and septum start simultaneously with shortening (negative strain), but the RV reaches its peak later than the LV, by 12% of the cardiac cycle time. The closure times of aortic and pulmonary valves (Taortacl and Tpulmcl) are coincident with the peak of LV shortening. The time of maximal leftward septal bowing (Tlvsb) is coincident with septal stretching (positive strain) and with the peak of RV shortening. The opening times of mitral and tricuspid valves (Tmitr-op and Ttric-op) indicate the onset times of LV and RV filling. PAH = pulmonary arterial hypertension.