A 60-year-old man who drinks alcohol to excess presents with worsening heart failure symptoms. He is breathless on minimal exertion. His ECG shows LBBB. His angiogram shows normal coronary arteries. His echo is shown in Figs 16.1, 16.2, 16.3 and 16.4, and Videos 16.1, 16.2, 16.3, 16.4, 16.5, 16.6, 16.7, 16.8, 16.9, 16.10.