Cardiac Rhythm Management Devices

Pacemaker Code
A, atrial; V, vent; O, none; I, inhibition; D, dual; R, rate-adaptive 1st letter 2nd letter 3rd letter 4th letter
Chamber
paced
Chamber
sensed
Response to
sensed beat
Program
features
Common Pacing Modes
VVI Ventricular pacing on demand w/ single lead in RV. Sensed ventricular beat
inhibits V pacing. Used in chronic AF with symptomatic bradycardia.
DDD A & V sensing/pacing (RA & RV leads). Native A beat inhib A pacing & triggers
V pacing → tracking of intrinsic atrial activity. Maintains AV synchrony, ↓