Pacemakers are implantable devices used to control heart rate and rhythm in patients for whom arrhythmia is an intrinsic r&r inhibitor.
A lead, or leads, are inserted into the atrium and/or ventricles and the pacemaker box device sends electrical stimulus to the heart via this mechanism, in order to trigger depolarisation. The majority of pacemakers are designed to perform four functions:
- Stimulate cardiac depolarisation
- Depolarisation of chambers in response to a pacing stimulus
- Sense intrinsic depolarisation
- Detection of intrinsic cardiac activity
- Respond to increased metabolic demand by increasing pacing volume
- During exercise, the device increases HR to increase cardiac output
- Provide diagnostic information via internal storage
- Cardiac events
- Battery life
- Functional instructions
Pacemaker systems come in a number of forms, with multiple functions, and there exist many devices across numerous manufacturers.