Atrial Tracking Recovery

Question 1

What is the purpose of atrial tracking recovery?

Answer 1

Helps the device to recover and resume atrial tracking after a frequent PVC’s or following an atrial arrhythmia with a fast ventricular response

Question 2

Why is this algorithm important?

Answer 2

Helps maintain synchrony and restore CRT pacing

Question 3

What is the nominal programming for ATR?

Answer 3

Off

Question 4

In what modes is ATR available?

Answer 4

DDD, DDDR, while mode switch is not in effect

Question 5

Summarize how ATR works.

Answer 5

Monitors sustained ventricular sensing that may be due to loss of tracking of sensed atrial events falling within PVARP. ATR temporarily shortens PVARP so tracking can resume

Question 6

Explain in detail how ATR works.

Answer 6

ATR looks for 8 consecutive intervals where the following occurs: Vs-Ar pattern, regular atrial rates less than the UTR, Vs-Ar intervals greater than PVAB. If these conditions are satisfied, PVARP is shortened by 50ms, then calculates a temporary PVARP during subsequent cycles.

Question 7

When does ATR intervention end?

Answer 7

When a Vp occurs at the scheduled PAV interval or when the temporary PVARP is no longer shorter than the permanently programmed PVARP.

Question 8

What setting is important to consider with ATR?

Answer 8

The upper tracking rate.

Question 9

When is ATR suspended?

Answer 9

During tachy therapies, system tests, and testing.