What do pacemaker letters and codes mean?
Letters and Codes of Pacemaker Letter 1: [Chambers paced] A = Atria, V = Ventricles, D = Dual chamber (Atrium + Ventricle), 0 = none Letter 2: A = [Chambers sensed] Atria, V= Ventricles, D = Dual chamber (Atrium + Ventricle), 0 = none Letter 3: T = [Response to sending] Triggered, I = Inhibited, D = Dual (T + I), R = Reverse Letter 4: R = [Rate modulation] Rate modulation, 0 = none Letter 5: A = [Multisite pacing] Atrium, V = Ventricle, D = Dual chamber (Atrium + Ventricle)