Prognosis of Subjects With Unexplainable Precordial Deep T-wave Inversion Without Wall Thickness> 15mm

Inclusion Criteria: * Standard 12-lead electrocardiography showing deep T-wave inversion, most prominent in the anterolateral leads (V3-V5 leads) with the negative T wave voltage ≥5mm. * Without evidence of coronary artery disease, or diameter stenosis ≥50% in one or more coronary vessels. * Asymmetrical LV hypertrophy confined to the LV apex below the papillary muscle level; end-diastolic apical wall thickness \<15mm with the apical to basal posterior wall thickness ratio \<1.5. Exclusion Criteria: * Subjects who were not in sinus rhythm; * Patients with T-wave inversion in ≤ 2 contiguous leads, concomitant bundle branch block or QRS\>80 ms or QTC\>440 ms were excluded. * Blood pressure ≥140/90mmHg. * Severe valvular lesion, pericardial disease, cardiac tumor, immunological or metabolic disease involving heart. * History of cardiac surgery.