75 year old male with severe dyspnoea

Having never been to a doctor in his life, this gentleman was very hesitant about receiving treatment after his wife brought him into the hospital with severe SOB, getting worse by the day.
O/E he has a VERY loud, split systolic turbulence that masks a possible holosystolic murmur at the apex. He has bilateral crackles and is peripherally cyanotic, using all of his accessory muscles.

This ECG is performed:

Systematically, what does this ECG show?
What could be causing these obvious ECG abnormalities?
Every precordial lead (particularly V1-V4) shows an abnormality or phenomena called...?