What are the dangers of having a pacemaker?

Procedure dangers: During pacemaker procedure - rupture, pericarditis, infections of site , which rarely happens, very safe and easy procedures that saves life.

None really: Pacemakers are pretty much standard these days. Present day pacemakers provide synchrony between the top and bottom chambers of the heart and some also between both chambers. Pacemakers in the past were stuck at a certain rate clearly making it less than physiological. Current devices will increase the rate of pacing based on the amount of activity you are doing utilizing sensors.