Estella Pulse Generators - BIOTRONIK USA - News

46 Estella Pulse Generators Technical ManualMode SwitchingThe Mode Switching algorithm causes the pulse generator to changepacing modes when a programmed number of atrial intervals (X) outof 8 consecutive atrial intervals (p-p) are faster than the programmedmode switch intervention rate (X out of 8). X is programmable from3 to 8. The rate at which an atrial interval is determined to signify anatrial tachyarrhythmia is called the mode switch intervention rate. Themode switch intervention rate is programmable from 100 to 250 bpm. AMode Switch Basic Rate can be programmed to allow for a higher basicrate during an active Mode Switch, in order to diminish undesirablehemodynamic behaviors.The mode switch occurs from atrial tracking to non-atrial trackingpacing modes (e.g. DDDR to DDIR) as described in Table 14.Reversion back to the programmed pacing mode occurs in a similarlyprogrammable manner. If a programmable number of atrial intervals (Z)out of 8 consecutive atrial intervals (p-p) are slower than the programmedmode switch intervention rate (Z out of 8), the device will revert backto the permanently programmed parameters. Z is programmable from3 to 8. The device will also revert back to the permanent program if noatrial paced or sensed events have occurred for at least 2 seconds.Additionally, during DDI(R), the AV‐delay is set to 100 ms.Mode Switch Events are recorded in memory and are available to the userthrough the following diagnostics:• IEGM Recordings Found in the Holter Tab• Mode Switch Counter• Total Mode Switch DurationMode Switching is available during magnet application after 10 cycles ofASYNC pacing and during ERI. Mode Switching occurs as described inTable 14.Table 14: Programmable Mode SwitchesProgrammed Pacing Programmable Mode Switch Pacing ModesModeRate-Adaptive Non-Rate-AdaptiveDDDR and DDDR-ADIR DDIR N/AVDDR VDIR N/ADDD and DDD-ADI DDIR DDIVDD VDIR VDI