An ECG technician is placing leads on a patient who has presented to the emergency department with a sudden onset of chest pain
The technician would recognize which of the following facts about the placement of leads and the achievement of a clinically accurate ECG?
A)
The electrical potential recorded by a lead on an extremity will vary significantly depending on where the lead is placed on the extremity.
B)
The chest leads measure electrical activity on the horizontal plane, while limb leads measure it on the vertical plane.
C)
Limb leads measure the electrical activity of the heart indirectly through the activity of adjacent skeletal muscle.
D)
A total of 12 chest leads are necessary to attain the most accurate ECG.
Ans:
B
Feedback:
A complete ECG is obtained by combining data from chest leads, which measure activity on the horizontal plane, and limb leads, corresponding to the vertical or frontal plane. The electrical potential recorded by a lead on an extremity should not vary significantly depending on where the lead is placed on the extremity, and limb leads do not measure electrical activity by way of skeletal muscle activity. A total of 12 leads, only six of which are on the chest, are necessary for a complete ECG.
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