What QRS axis range defines right axis deviation?

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Multiple Choice

What QRS axis range defines right axis deviation?

The QRS axis reflects the overall direction of ventricular depolarization in the frontal plane, so right axis deviation means the mean vector points toward the right, roughly between +90° and +180°. In the standard ECG, this orientation usually produces a negative QRS in lead I and a positive QRS in lead aVF, which matches an axis in the +90° to +180° range. The other ranges don’t fit RAD: -90° to -180° corresponds to an extreme leftward projection, not rightward; 0° to +90° is the normal axis; -30° to -90° is left axis deviation.

The QRS axis reflects the overall direction of ventricular depolarization in the frontal plane, so right axis deviation means the mean vector points toward the right, roughly between +90° and +180°. In the standard ECG, this orientation usually produces a negative QRS in lead I and a positive QRS in lead aVF, which matches an axis in the +90° to +180° range.

The other ranges don’t fit RAD: -90° to -180° corresponds to an extreme leftward projection, not rightward; 0° to +90° is the normal axis; -30° to -90° is left axis deviation.

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