Alterations in atrial electrophysiology associated with chronic atrial fibrillation in man
Summary
This summary is machine-generated.Chronic persistent atrial fibrillation (AF) disrupts normal atrial electrophysiology. Patients with AF lose the typical longer refractory period at the right atrial appendage, increasing recurrence risk post-cardioversion.
Area Of Science
- Cardiology
- Electrophysiology
- Atrial Fibrillation Research
Background
- Chronic persistent atrial fibrillation (AF) is a complex cardiac arrhythmia.
- Understanding atrial electrophysiology changes in AF is crucial for treatment.
Purpose Of The Study
- To investigate alterations in atrial electrophysiology in patients with chronic persistent AF.
- To compare atrial electrophysiological properties between AF patients and controls.
Main Methods
- Measured atrial monophasic action potential duration and effective refractory periods (ERPs).
- Studied 13 patients with chronic persistent AF and 8 controls.
- Recorded electrophysiological data at the right atrial appendage and midlateral right atrial wall.
Main Results
- Controls exhibited longer ERPs at the atrial appendage compared to the lateral wall.
- AF patients showed shorter monophasic action potentials and ERPs at both sites.
- Significant shortening of ERPs at the right atrial appendage was observed in AF patients.
Conclusions
- The normal pattern of atrial refractory dispersion is lost in chronic persistent AF.
- Marked shortening of the effective refractory period at the right atrial appendage in AF patients.
- This electrophysiological change may explain high AF recurrence rates after cardioversion.
View abstract on PubMed