What axis range characterizes right axis deviation?

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Multiple Choice

What axis range characterizes right axis deviation?

The key idea is the direction of the mean QRS axis in the frontal plane. Right axis deviation means the ventricles’ depolarization vector points to the right, which on the hexaxial reference system corresponds to angles greater than +90 degrees, up to about +180 degrees. So right axis deviation is typically +90° to +180°. The range 0° to +90° stays within the normal axis, so it does not indicate RAD. Left axis deviation sits in the negative range, roughly -30° to -90°, or more negatively. In short, RAD is defined by a QRS axis beyond +90°, not 0° to +90°.

The key idea is the direction of the mean QRS axis in the frontal plane. Right axis deviation means the ventricles’ depolarization vector points to the right, which on the hexaxial reference system corresponds to angles greater than +90 degrees, up to about +180 degrees. So right axis deviation is typically +90° to +180°. The range 0° to +90° stays within the normal axis, so it does not indicate RAD. Left axis deviation sits in the negative range, roughly -30° to -90°, or more negatively. In short, RAD is defined by a QRS axis beyond +90°, not 0° to +90°.

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