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Which of the following does limb lead II of a typical electrocardiogram represent?

waelhammad
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2022-10-18
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Which of the following does limb lead II of a typical electrocardiogram represent?

  1. A graph of the variation of voltage produced by the heart against time.
  2. The voltage at right arm (RA) plus the voltage at left leg (LL).
  3. The electrical events that precede the contraction of the ventricles.
  4. The projection of the electric dipole vector of the heart on the line from left arm (LA) to right arm (RA).
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waelhammad
2022-10-18
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A: This is the best answer. “Lead II” is the voltage measured at the RA position minus the voltage measured at the LL position. “Lead II” is also the projection of the electric dipole vector of the heart on the line RII (in Einthoven’s triangle) from right arm to the left leg.

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