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 ...

This article explores sinus arrhythmia, including its cause, types, and whether treatment ... (the time between consecutive P waves) is the same throughout the ECG. Also, the heart rate (how ...

How 2nd-Degree Heart Block Type 1 Looks on ECG Since second-degree heart block ... On ECG, a regular heartbeat starts with a smaller, round P wave as electricity stimulates the atria.