A 67-year-old male presen...

A 67-year-old male presented with a sudden onset of breathlessness at rest (NYHA CLASS IV) without a history of comorbidities or past similar complaints and no reported addiction. On arrival, vital signs include a regular pulse of 108bpm, blood pressure of 140/90 mmHg, elevated jugular venous pressure (4 cm above sternal notch), and 98% oxygen saturation on 4 litres/min oxygen. Clinical findings reveal normal heart sounds, an early systolic murmur at the apex radiating to the axilla, bilateral basal fine inspiratory crepitations, and absent breath sounds in the right post-scapular line below the 5th intercostal space. Laboratory results indicate elevated CPKMB (150 U/L), HsTROPT (645 ng/dl, 2098 ng/dl), and NTproBNP (5400 pg/ml). ECG shows signs of left bundle branch block (LBBB), and 2D echocardiography indicates hypokinesia of the apicolateral, apical, and apicoseptal segments with a left ventricular ejection fraction (LVEF) of approximately 35-40%, as shown in an image. Coronary angiography reveals insignificant plaques in the left anterior descending artery (LAD). What will be the likely diagnosis for this patient?