Table 1 Methods for left atrial volume quantification with two‐dimensional echocardiography.
| Method | Parameter | View | Equation | Assumption |
|---|---|---|---|---|
| Cube | APD | PSLAX | 4/3π (APD/2)3 | LA has a spherical shape |
| Ellipsoid | APD | PSLAX | 4/3π (APD/2)(D1/2)(L/2) | LA has an ellipsoid geometry |
| LA transversal diameter (D1) | 4CH | |||
| LA length (L) | 4CH | |||
| Area–length | LA area planimetry (A2C) | 2CH | 8/3π [(A4C)(A2C)/L] | LA has an ellipsoid geometry |
| LA area planimetry (A4C) | 4CH | |||
| LA length (L) | 2CH or 4CH | |||
| Modified Simpson's rule | LA planimetry | 2CH | Summation of discs | Total volume can be calculated from sum of smaller volumes |
| 4CH |
APD, anterior–posterior diameter; LA, left atrium; PSLAX, parasternal long‐axis; 2CH, two‐chamber view; 4CH, four‐chamber view.