When is a ventricular pacemaker used alone?
A. When both the atria and the ventricles need to be stimulated to contract
B. When the conduction system from the AV node through the ventricles is intact and functioning
C. When the atria need to contract completely before the ventricles to allow for an atrial kick
D. When conduction in the ventricles is not working properly, so the ventricles must be stimulated to contract
Answer: D
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