| Position: | I | II | III | IV | V |
| Category: | Chamber(s) Paced | Chamber(s) Sensed | Response to Sensing | Rate Modulation | Multisite Pacing |
| O = None | O = None | O = None | O = None | O = None | |
| A = Atrium | A = Atrium | T = Triggered | R = Rate modulation | A = Atrium | |
| V = Ventricle | V = Ventricle | I = Inhibited | V = Ventricle | ||
| D = Dual (A + V) | D = Dual (A + V) | D = Dual (T + I) | D = Dual (A + V) | ||
| Munufacturers’ designation only: | S = Single (A or V) | S = Single (A or V) |