Pacemakers & TURP: Understanding Heart Rate Regulation and Prostate Cancer Risk

Question
1/ How does an implanted pacemaker sense and adjust the heart rate when one is resting or exercising ?
2/ In undergoing a prostate resection isn't there a risk that cancer cells, if present within the prostate,could be released and migrate to other sites within the body ?  

Answer
1/ How does an implanted pacemaker sense and adjust the heart rate when one is resting or exercising ?
It senses the demand if it is a demand sensing pacer.


2/ In undergoing a prostate resection isn't there a risk that cancer cells, if present within the prostate,could be released and migrate to other sites within the body ?
Yes, that is true so some surgeons use radiation to seal the lymph channels by which this occurs