Figure 3

Area stretch ratio of the cardiac walls at (A) mid-ventricular-systole and (B) mid-ventricular diastole for the 5 embryonic subjects evaluated. Circled area showed the appendages. Area stretch of 1.0 indicated no contractile stretch, while area stretch of less than 1.0 indicates contraction. A video of area stretch for case 2 was uploaded as online Supplementary Video 1.