What Does the "A" Represent in the Unipolar Limb Leads

Question

What does the "a" represent in the unipolar limb leads?
A) abatement
B) attenuation
C) alteration
D) augmentation

Accepted Answer

The "a" in the unipolar limb leads (such as aVR, aVL, and aVF) stands for "augmentation," indicating that the signal is augmented or increased in magnitude to improve the quality of the electrocardiogram (ECG) recording.