Left QRS axis deviation
More common causes
Left ventricular hypertrophy
Chronic obstructive pulmonary disease
Congenital heart disease
Myocardial infarction
Wolff-Parkinson-White syndrome
Less common causes
Hyperkalemia
Tricuspid atresia
Uncommon causes
Ostium primum atrial septal defect
Cardiac pacing
Left anterior fascicular block
Inferior wall myocardial infarction
Ventricular ectopics