A Propranolol consuming patient was admitted to ED for hypotension and severe discomfort. No other history was available. ECG revealed regular rhythm at 30bpm, narrow QRS complex while P waves were not visible.

Identify this cardiovascular complication from attached ECG only. *This case is from Docplexus editorial team for educative purpose only. Source: NEJM Stay Connected, the answer will be posted in the next 48h!