Conversation so far:
pacemaker is related to which part of body
A pacemaker is a small device that's placed in the chest or abdomen.
what is the function of a pacemaker device
A pacemaker is a device placed in the chest or abdomen to help control abnormal heart rhythms, using electrical pulses to prompt the heart to beat at a normal rate.

Question: What happens when there is abnormality
Self-contained rewrite: What happens when then heart rhythms are abnormal