Table 1

Abnormal ECG findings suggestive of cardiomyopathy

Abnormal ECG findingDefinition
T wave inversion>1 mm in depth in two or more leads V2–V6, II and aVF or I and aVL (excludes III, aVR and V1)
ST segment depression≥0.5 mm in depth in two or more leads
Pathological Q waves>3 mm in depth or >40 ms in duration in two or more leads (except III and aVR)
Complete left bundle branch blockQRS≥120 ms, predominantly negative QRS complex in lead V1 (QS or rS), and upright monophasic R wave in leads I and V6
Intraventricular conduction delayAny QRS duration ≥140 ms
Left axis deviation−30° to −90°
Left atrial enlargementProlonged P wave duration of >120 ms in leads I or II with negative portion of the P wave≥1 mm in depth and ≥40 ms in duration in lead V1
Right ventricular hypertrophy patternR-V1+S-V5>10.5 mm AND right axis deviation >120°
Premature ventricular contractions≥2 PVCs per 10 s tracing
Ventricular arrhythmiasCouplets, triplets and non-sustained ventricular tachycardia
  • Note: These ECG findings are unrelated to regular training or expected physiological adaptation to exercise, may suggest the presence of pathological cardiovascular disease, and require further diagnostic evaluation.