Soar High with the 2025 CFRN Test – Elevate Your Nursing Career to New Heights!

Extreme right axis deviation (RAD) is typically defined as an axis measurement between +120° and +180°. This pattern can be observed in several clinical scenarios, and in the context of this question, one of the most notable conditions associated with extreme RAD is ventricular tachycardia (VT).

In ventricular tachycardia, the electrical impulses originate from the ventricles rather than the normal conduction system, which can lead to an abnormal QRS morphology and changes in the electrical axis. The rapid and chaotic electrical activity in VT significantly alters the depolarization sequence through the heart, often resulting in an extreme right axis deviation on the electrocardiogram (ECG).

The other conditions listed do not typically result in this extreme shift in the electrical axis. For instance, SA node failure can lead to alterations in the heart's rhythm but does not directly produce extreme RAD. Septal wall myocardial infarction (MI) typically influences the left axis due to the loss of electrical conduction through the affected wall, while left bundle branch block usually causes a leftward shift in the axis instead of the right. Therefore, among the given options, ventricular tachycardia stands out as the most clearly associated condition with extreme right axis deviation.