Atrial Rate Stabilization Flashcards
What is Atrial Rate Stabilization?
A programmable feature designed to prevent the long sinus pause followed by a PAC.
What is the nominal setting for ARS?
Off
In what modes is ARS available?
DDDR, DDD, AAIR, AAI
What are the programmable parameters for ARS?
Maximum Rate, Interval Percentage Increment
What is the interval percentage increment?
Pacing interval increment per beat, as a percentage of the preceding interval.
Where is this feature found?
Pacers: Params>Arrhythmia Interventions, ICD’s: Params>Pacing>Arrhythmias/Post Shock
What features cannot function with ARS?
Rate Hysteresis
When must ARS be turned Off?
When polarity is unipolar or when Lead Monitor is set to Adaptive for the atrial lead.
How does ARS work?
At the onset of an atrial event (As, Ap, or pertinent Ar event), the device calculates a new pacing interval that is equal to a programmed percentage shorter than the current pacing interval.
What if the current interval pacing interval ends before the device senses an atrial event?
The device will atrially pace and then calculate a new interval based on that interval.
What happens after a PAC?
The calculated escape interval stabilizes and the atrial rate gradually slow to the intrinsic rate, sensor indicated rate or programmed lower rate (whichever is attained first).
When is the algorithm suspended?
During mode switch or during the detection of an arrhythmia.
What happens if this algorithm is used with Atrial Preference Pacing and Ventricular Rate Stabilization?
The most aggressive algorithm/shortest escape interval is used for each cycle.
What affect can non-competitive atrial pacing have on this algorithm?
It may delay an atrial pace.
How are atrial preference pacing and atrial rate stabilization notated on the marker channels?
PP (proactive pace)
