| The LA size is measured at the end-ventricular systole when the LA chamber is at its greatest dimension. While recording images for computing LA volume, care should be taken to avoid foreshortening of the LA. The base of the LA should be at its largest size indicating that the imaging plane passes through the maximal short-axis area. The LA length should also be maximized ensuring alignment along the true long axis of the LA. When performing planimetry, the LA, the confluences of the pulmonary veins, and LA appendage should be excluded. |