Last week the V 1.2 upgrade was approved by the App Store. A chart on Pacemakers was added. It opens with a diagram/animation of AV sequential pacing (wires in both the atria and ventricles, pacing in both chambers). This can be switched to a system showing sinus rhythm, with the pacer tracking the atria, then pacing the ventricles. There are the usual labels leading to further discussion about multiple of topics, including the Pulse Generator, the Leads, etc.
As usual, upgrades to iPad apps are free.