The complications of pacemaker implantation include:

1. Infection of the pacemaker pocket (treated with IV antibiotics).
2. Infection of the pacemaker leads (requires explantation of the device).
3. Lead dislodgement/fracture (requires repositioning or replacement of lead).
4. Pericardial effusion/tamponade from right ventricular perforation.
5. Congestive heart failure (from induced ventricular dyssynchrony from RV pacing).