Manufacturer | Algorithm |
Medtronic
|
Blanked Flutter Search When set criteria are fulfilled, it prolongs the PVARP for one cycle, so that the next atrial events lie in the refractory period and true atrial rate can be detected. It is useful in situations where every alternate beat falls in the blanking period |
Boston Scientific
|
Atrial Flutter Response It is operational only when atrial events are detected in PVARP. The algorithm increases the refractory period by a programmable duration for every atrial event that is sensed in the refractory period, so that high rates are not tracked. If atrial events continue to be sensed with every extension of the refractory period, ventricular pacing occurs at the lower set rate, and mode switch is initiated. It is not useful when every alternate beat falls in the blanking period. |
Biotronik
|
2:1 Lock-in Protection When the suspicion criteria are met, the atrioventricular delay is increased by the a programmed interval. If the event sensed in this window moves with the ventricular paced event, it is cross-talk. However, if it does not move with the ventricular paced event when the atrioventricular delay is extended, it is an intrinsic atrial event, and mode switch is initiated. It is useful in situations where every alternate beat falls in the blanking period. |
Abbott
|
Filtered Atrial Rate Interval (No specific algorithm for flutter) The device measures the current PP interval for each beat and calculates a filtered atrial rate interval (FARI). P waves falling in the PVARP followed by atrial sensing are taken into account when calculating the FARI and mode switch occurs when FARI is less than the atrial tachycardia detection interval. It is not useful when every alternate beat falls in the blanking period. |