A cardiac interface device helps program an implantable cardiac rhythm or function management device, such as to reduce unnecessary ventricular pacing to avoid contributing to the advancement of heart failure disease progression. The method includes, for each test frequency fi, where i=1,. These polymer blends swell in an acidic environment and deswell in a more neutral or basic environment. The method stores VM virtual disk data changes resulting from restoration and verification in a changes storage. The computer can provide access to the video, and when the video reaches the time stamp, the advertisement is played in the advertisement space.