Introduction: Left axis deviation of QRS complex on ECG Left axis deviation of QRS complex on ECG: Introduction Introduction: Left axis deviation of QRS complex on ECG Left axis deviation of QRS complex on ECG: Introduction Causes of Left axis deviation of QRS complex on ECG Introduction: Left axis deviation of QRS complex on ECG Causes of Left axis deviation of QRS complex on ECG Left axis deviation of QRS complex on ECG Left axis deviation of QRS complex on ECG Introduction: Left axis deviation of QRS complex on ECG