If no P waves can be seen and the QRS complexes ... block is from second-degree type I or second-degree type II AV block (see 2:1 AV block ECG Review). A posterior wall MI shows ST depression ...
This ECG has both second degree AV block with 2:1 block and second degree type I AV block. Note that intermittent P waves conduct to the ventricles on this ECG tracing, however it is clear that ...