AKT-0132

A 42-year-old amateur footballer visits his General Practitioner with complaints of feeling lightheaded during exercise. Upon physical examination, a laterally displaced apical impulse is noted. On auscultation, a mid-systolic murmur is heard in the aortic area that intensifies upon sudden standing. The electrocardiogram (ECG) reveals left ventricular hypertrophy (LVH) and Q waves in the V2-V5 leads.

What is the most probable diagnosis?