What does an upright QRS in lead I and an upright QRS in lead AVF indicate?

What does an upright QRS in lead I and an upright QRS in lead AVF indicate?

• A. The patient has a normal axis
• B. The patient has left axis deviation
• C. The patient has right axis deviation
• D. The patient has an abnormal axis

Answer: (A)

An upright QRS complex in lead I, coupled with an upright QRS complex in lead AVF, indicates that the heart's electrical axis is oriented in a normal range. Normal axis is defined by the QRS complexes being positive in both lead I (which represents the left lateral aspect of the heart) and lead AVF (which represents the inferior aspect of the heart). This finding typically suggests that the depolarization of the heart is occurring in a standard pathway, aligning well with a normal heart structure and function.

In a normal axis, the overall direction of the electrical activity from the heart points towards a combination of the left and inferior directions, which corresponds to the positive deflections seen in both these leads. This helps healthcare providers assess the patient's cardiac electrical activity and can guide further evaluations or interventions if needed.