In axis analysis, what term describes the vectors drawn from a central reference point to each lead’s positive electrode, forming a frontal plane map?

In axis analysis, what term describes the vectors drawn from a central reference point to each lead’s positive electrode, forming a frontal plane map?

• A. Frontal Plane Vectors
• B. Transverse Plane Vectors
• C. Median Vector Map
• D. Circumferential Axes

Answer: (A)

In axis analysis, the mean electrical activity is projected onto the frontal plane and represented by vectors drawn from a central reference point to each limb-lead’s positive electrode. This set of arrows forms the Frontal Plane Vectors, which visually map how the heart’s depolarization directed along the limb leads aligns in the frontal view and helps estimate the QRS axis. The other terms don’t fit this specific frontal-plane mapping: a transverse plane concept relates to the horizontal plane, and Median Vector Map or Circumferential Axes aren’t standard ECG axis terminology.