Standardized 2D-TTE imaging planes to assess the precise localization of prolapsing or flailing segments. (A) Parasternal long-axis view. (B) Parasternal short-axis view. (C) Apical four-chamber view. (D) Apical two-chamber view (intercommissural plane). Ao = ascending aorta; LA = left atrium; LV = left ventricle; LAA = left atrial appendage; RV = right ventricle; TV = tricuspid valve.