Arrhythmias & electrophysiology
Behavior of leadless atrioventricular synchronous pacing during exercise
Authors' conclusion
Maintaining AV synchrony during maximal exercise in elderly patients is achievable by adequate detection of atrial contraction at fast sinus rates by the leadless Micra AV pacemaker. All components of the accelerometer signal increased, likely because of increased contractility related to exercise.
Study context
- Population
- Outpatients implanted with a Micra atrioventricular (AV) pacemaker undergoing a cycle exercise testmean age 75.6 ± 13.4 years
- Participants
- 35 outpatients
- Outcome
- AV synchrony during exercise
Main finding
As reported in the abstract
Observational data: associations, not effects.
Further findings
Accelerometer signal amplitude, start to peak of exercise
- A1 mean amplitude increased (m/s2)
- 4.1-6.3
- A2 mean amplitude increased (m/s2)
- 2.4-3.8
- A4 mean amplitude increased (m/s2)
- 4.5-7.6
- P < .01 for all
Time from ventricular event (VS/VP) to A2
- Decrease per 100 ms decrease of R-R interval
- 25 ms
Original publication
Behavior of leadless atrioventricular synchronous pacing during exercise. Heart Rhythm. Published 6 November 2024. doi:10.
Summarised from the published abstract; every number is checked against it