title: Pacemakers: abnormal function.
abstract: Although intermittent or total loss of capture may occur at any time following pacemaker implantation, the peak incidence is either very early (less than 4 weeks) or very late (more than 3 years) in the life of the device. Oversensing may be a cause of recurrent syncope in patients who, during routine office visit testing, appear to have normally functioning pacemakers.
mesh_terms: D000368:Aged; D004868:Equipment Failure; D006801:Humans; D010138:Pacemaker, Artificial