|A. Optimize LA image quality||Atria are located in the far field of the apical views. Reduction of lateral resolution may result in apparently thicker LA walls.|
|B. Obtain maximal LA size||LA is foreshortened|
|C. Timing of maximum LA size||Correct frame for measurement is not selected||Choose frame just before mitral valve opening|
|D. LA area planimetry||LA border is inconsistently defined|
|E. Long-axis LA length||LA long axis is inconsistently delineated|
|F. Interpretation||Qualitative categorization of LA size||LA volume indexed to body surface area is optimally interpreted as a continuous variable (using a reference point of 22 ± 5 ml/m2as “normal”)|
LA = left atrial.
↵⁎ Also see the Appendix.