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| I Chambers paced | II Chambers sensed | III Response to sensing | IV Rate modulation | IV Multisite pacing |
|---|---|---|---|---|
| O: none | O: none | O: none | O: none | O: none |
| V: ventricle | V: ventricle | T: trigger | A: atrium | |
| A: atrium | A: atrium | I: Inhibited | V: ventricle | |
| D: dual (A+V) | D: dual (A+V) | D: dual (A+V) | D: dual (A+V) | |
| S: Single-chamber (A or V) | S: Single-chamber (A or V) | R: rate modulation |
