Fig. 2.
Interatrial septal (IAS) movement patterns for all measurements across echocardiographic studies against pulmonary capillary wedge pressure (PCWP). The intervals, the mean, and 95% CI for PCWP. Mid-systolic reversal is the normal pattern where the septum changed direction and moved toward the left atrium during mid-systole, and fixed curve means that the IAS is bowed toward the right atrium throughout the cardiac cycle.