fig51

Figure 51. Echo images from an apical four-chamber projection illustrating plotting of the area of the left atrium (LA). While the area measurements can be made (see insert at the top left of the image), normal values for several premature baby groups have not been established. The left ventricle (LV), right atrium (RA), and right ventricle (RV) are labeled. Reproduced from Ref.^[36].