Two types of external pacemakers are available: single and dual chamber pacemakers. Both are recommended for cardiac pacing.
All external pacemakers should have adjustable rate, output amplitude, and sensitivity settings.
Single chamber pacemakers can pace only a single chamber of the heart, while dual chamber pacemakers can pace both chambers.
The single chamber external invasive electrode pacemakers are used in VVI mode, while dual chamber external invasive electrode pacemakers are used in DDD mode.
Patients undergoing open-heart surgery, whom prophylactic placement of both atrial and ventricular epicardial leads is common use dual chamber pacemakers.
External, invasive electrode pacemakers are available as either constant-current or constant voltage devices, while implant pacemakers only offer constant voltage output.
Temporary pacemaker systems use an external pulse generator with leads placed via transvenous cardiac pacemaker approaches. Transcutaneous leads are the easiest to use but transvenous cardiac pacemaker leads are the most reliable options for temporary pacemakers.
It is not recommended to use dual chamber pacemakers for single chamber pacing, though it is possible. The dual type is more complex, and therefore requires more training and experience to achieve and maintain proficiency.

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