1. Scientific objective The study objective is to clarify the grounds of heart exertional dyspnoea stenocardial pain in patients with well-controlled stage I or II hypertension according to ESH (European Society of Hypertension), without changes in epicardial coronary arteries in coronary angiography and normal resting echocardiography result, and to assess of potential early markers of heart hypertrophy and failure in patients with hypertension.