The ECG shows non-conducted PACs, which can sometimes mimic AV block. After each QRS complex, there are premature P waves that appear earlier than expected. These P waves have a different morphology compared to sinus P waves. This difference is most noticeable in V2-V4. Because they occur when the AV node is still in refractory period, they fail to conduct, leading to a pause that can be mistaken for an AV Block.