CONCLUSION
Among pregnant women with even milder forms of LVOTO/AS, increases in cardiac volumes and AV gradients can be expected over the course of pregnancy and to a greater degree than in pregnant women without structural heart disease. Despite this, LV function and mechanics remain in the normal range with LV function showing a trend to decline over the course of pregnancy. No adverse cardiac events were observed in this cohort. Significant LVOTO/AS is associated with reduced LV function and mechanics as compared to mild LVOTO/AS, and in the event of clinically relevant reduction, would likely account for adverse events. This warrants further study with a focus on sequential LV function/mechanics assessment over the course of pregnancy among those with only significant LVOTO/AS.