The parameters of average image intensity (AII), AII% (normalized AII) and peak to peak intensity (PPI) in IVS, LVPW of 3 groups mentioned above were measured by AD technology.

• 再用AD技术检测上述三组室间隔、左室后壁的AD参数即AII、AII%25(室间隔与心包的AII的比值)及PPI值。