Related Experiment Videos
Interatrial conduction during cardiac pacing
Pacing and Clinical Electrophysiology : PACE
|November 1, 1986
Summary
DDD pacemakers require optimal atrioventricular synchrony. Interatrial conduction time (IACT) prolongs during right atrial pacing, especially in patients with prolonged P wave duration, necessitating adjustments in pacemaker programming for improved cardiac function.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Devices
Background:
- Atrioventricular synchrony is crucial for systemic hemodynamics, influenced by interatrial conduction time (IACT).
- DDD pacemakers manage cardiac rhythm by sensing and pacing the right-sided heart chambers.
Purpose of the Study:
- To investigate the impact of right atrial pacing on interatrial conduction time (IACT) in patients undergoing DDD pacemaker implantation.
- To determine optimal atrioventricular (AV) interval programming for DDD pacemakers based on IACT measurements.
Main Methods:
- Interatrial conduction time (IACT) was measured using an intraesophageal pill electrode in 25 patients without cardiac medications.
- IACT was assessed during both sinus rhythm and right atrial pacing at various rates (60-160 bpm).
- Patients were stratified based on P wave duration (<110 ms and >110 ms).
Main Results:
- Mean IACT significantly prolonged from 95 ms (sinus rhythm) to 122 ms (right atrial pacing) (p < 0.001).
- Patients with prolonged P wave duration (>110 ms) exhibited longer IACT during both sinus rhythm and right atrial pacing compared to those with normal P wave duration.
- IACT remained constant across different right atrial pacing rates (60-160 bpm).
Conclusions:
- Right atrial pacing prolongs interatrial conduction time (IACT), with a more pronounced effect in patients with pre-existing P wave prolongation.
- The AV interval during DDD pacing should be programmed approximately 25 ms longer during AV pacing compared to atrial tracking to account for prolonged IACT.