A monotonous electrovectorcardiographic pattern gives us the diagnostic clue

Male, Asian, 55 years old, hypertensive on the use of losartan.
Several syncopes, all at rest or during sleep & atypical precordial pain.
Report an episode of polymorphic ventricular tachycardia at rest with reversion after cardioversion (we do not have the graphic documentation)
It was initially conducted by the emergency team as an acute coronary syndrome.
Normal physical examination
Normal echo, coronary angiography, and troponin level.
Family history: a brother died while sleeping at age 55.

Question

What are the vectorcardiographic elements for diagnosis?