Final answer:
The mean electrical axis (MEA) is a measurement used to determine the overall direction of electrical activity in the heart. In this case, the technician remembered that the QRS deflection was large and positive in lead aVF and 0 in lead I.
Step-by-step explanation:
The mean electrical axis (MEA) is a measurement used to determine the overall direction of electrical activity in the heart. It is typically measured in degrees and provides information about the health and function of the heart.
In this case, the technician remembered that the QRS deflection was large and positive in lead aVF and 0 in lead I. Lead aVF measures the electrical activity along the frontal plane of the heart, with a positive deflection indicating that the electrical activity is moving towards the lead. On the other hand, lead I measure the electrical activity along the horizontal plane of the heart, with a 0 deflection indicating that there is no net electrical activity in that plane.
Therefore, based on the information provided, we can deduce that the mean electrical axis would be the direction between lead aVF and lead I. Given that lead aVF is positive and lead I is 0, the mean electrical axis would most likely fall in the quadrant between -90 degrees and 0 degrees on the hexaxial reference system.