EKG AcquisitionQuestion 42 of 100
Where should the limb electrodes be placed for a standard 12-lead EKG?
a.On the bony prominences of the wrists and ankles for the best signal
b.On fleshy, non-muscular areas of the arms and lower legs, positioned symmetrically
c.On the upper chest and abdomen for all four limb leads
d.Anywhere convenient, since limb lead position does not affect the tracing
Explanation
Limb electrodes belong on flat, fleshy areas of the arms and lower legs, placed symmetrically on the right and left, because bone conducts poorly and muscle bellies generate tremor artifact. Torso placement is acceptable only for continuous monitoring or when a limb is missing, and it must be documented because it alters the tracing. Limb position does affect amplitude and axis, so it is never arbitrary.
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