First-Degree AV Block with Prolonged PR Interval (>300 ms) and Persistent Pacemaker Syndrome Symptoms
This protocol addresses a specific sub-population of patients with first-degree atrioventricular block who carry a markedly prolonged PR interval and experience persistent symptoms clearly attributable to that conduction delay.
Clinical Scenario
The patient has first-degree AV block with a PR interval exceeding 300 ms, accompanied by persistent symptoms that resemble pacemaker syndrome and are clearly attributable to this prolonged atrioventricular conduction time. This combination — marked PR prolongation plus persistent symptoms — defines the population for the structured protocol below.
Treatment Approach
A permanent device-based rhythm intervention is the option considered in this setting, and the specific configuration of that intervention has a meaningful bearing on outcome — the full regimen, selection criteria, and guidance on approach are contained in the complete protocol.
Goal: Improvement of pacemaker syndrome-like symptoms
References
- Permanent pacemaker implantation should be considered for patients with persistent symptoms similar to those of pacemaker syndrome and clearly attributable to first-degree AVB (PR >0.3 s).
- There is weak evidence to show that marked PR prolongation (i.e. ≥300 ms), particularly when it persists or is prolonged during exercise, can lead to symptoms similar to pacemaker syndrome and/or that these can improve with pacing.
- In patients with AVB, DDD should be preferred over single-chamber ventricular pacing to avoid pacemaker syndrome and to improve quality of life.
DOI: 10.1093/eurheartj/ehab364
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