In Third Degree Heart Block,the pacemaker can be in either the:
A)atria or AV junction.
B)AV junction or ventricles.
C)SA node or ventricles.
D)SA node or atria.

Question

Quizplus · Accepted Answer

In Third Degree Heart Block, there is complete blockage between the atria and ventricles, which means the impulses generated in the SA node are not reaching the ventricles. Therefore, the pacemaker needs to be located in the AV junction or ventricles to ensure proper ventricular contraction. Choosing A or D would not be effective as the pacemaker would still be located in the blocked pathway between the atria and ventricles. Choosing C would not be ideal as the SA node is not reliable in Third Degree Heart Block and may not consistently generate a reliable impulse.

In Third Degree Heart Block,the Pacemaker Can Be in Either