No, the
pacemaker should not cause depression. More likely, the depression is related to the underlying heart condition that led to the need for
pacemaker implantation. The realization that he has a heart problem (and is not a young man anymore)may have also led to the depression. Also, it is possible that the depression has nothing to do with his heart. I would suggest calling his cardiologist who can make sure that he is adjusting to his
pacemaker in a satisfactory manner. Furthermore, he can arrange a consultation with a psychiatrist if he deems that necessary.