What is the normal QRS axis range in the frontal plane?

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Multiple Choice

What is the normal QRS axis range in the frontal plane?

The frontal-plane QRS axis represents the average direction of ventricular depolarization projected onto the limb-lead view. In most adults, this net vector points downward and to the left, so the normal range is approximately -30 to +90 degrees. If the axis falls more negative than -30, that’s left axis deviation; if it exceeds +90, that’s right axis deviation. The other ranges either extend beyond what is typically seen in healthy adults or do not reflect the common leftward/downward orientation of the heart, so they are not considered normal.

The frontal-plane QRS axis represents the average direction of ventricular depolarization projected onto the limb-lead view. In most adults, this net vector points downward and to the left, so the normal range is approximately -30 to +90 degrees. If the axis falls more negative than -30, that’s left axis deviation; if it exceeds +90, that’s right axis deviation. The other ranges either extend beyond what is typically seen in healthy adults or do not reflect the common leftward/downward orientation of the heart, so they are not considered normal.

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