On a hexaxial diagram (see figure 1): RAD is an ECG finding that arises either as an anatomically normal variant or an indicator of underlying pathology.

[citation needed] Chest pain Fatigue Shortness of breath[1] Obesity Gender Hypertension Diabetes Physical inactivity Age Alcohol Dizziness Fainting Pulmonary hypertension Mitral stenosis Pulmonary embolism Congenital heart disease Arrythmogenic right ventricle cardiomyopathy Fainting Palpitations[3] Drug toxicity (e.g. tricyclic antidepressants[5]) Hyperkalaemia Blockage of the left posterior fascicle would lead to activation of the anterior portion of the left ventricle followed by activation of the rest of the ventricle in a superior to inferior direction and directed towards the right.

They produce QRS complexes of relatively short durations with a right bundle branch block pattern.

As it arises from the right ventricle, the impulse spreads inferiorly from beneath the pulmonary valve, and there right axis deviation.

[14][15] These include right ventricular hypertrophy, reduced muscle mass of left ventricle, altered conduction pathways and change in the position of the heart in the chest.

[citation needed] Enlargement of right ventricular myocardial mass can result in right axis deviation.

[15] Firstly, more muscle mass will result in greater amplitude of depolarisation of that side of the heart.

[citation needed] Changes in the conduction pathways of the heart can result in right axis deviation.

[16] Pathologically, conditions such as a left-sided pneumothorax and lung hyperinflation (e.g. COPD)[17] can cause rightwards displacement of the heart.

In general, a positive (upwards) deflection of an ECG trace demonstrates an electrical activity that moves towards the measuring electrode, whereas a negative (downwards) deflection of an ECG trace demonstrates an electrical activity that moves away from the measuring electrode.