Fig. 3

Graphs demonstrating myocardial velocities (absolute values) before and after intrauterine transfusion obtained from color tissue Doppler imaging in the left ventricular wall. Red squares indicate fetuses with severe anemia. Dotted lines represent reference ranges with 5th, mean and 95th centiles. Am, peak myocardial velocity during atrial contraction; Sm, peak myocardial velocity during ventricular ejection (systole); Em, peak myocardial velocity during rapid ventricular filling