Alterations in atrial electrophysiology associated with chronic atrial fibrillation in man
Abstract
BACKGROUND: The purpose of this study was to determine the changes in atrial electrophysiology associated with chronic persistent atrial fibrillation in man. METHODS AND RESULTS: Atrial monophasic action potential duration at 90% repolarization and the effective refractory period were measured in 13 patients with chronic persistent atrial fibrillation after low-energy endocardial cardioversion, and compared to eight controls without a history of atrial fibrillation. Measurements were made at the right atrial appendage and midlateral right atrial wall at basic, 600 ms and 400 ms drive cycle lengths. In control patients, the effective refractory periods were significantly longer at the atrial appendage than the lateral wall at 600 ms (right atrial appendage 265 ms, midlateral right atrial wall 228 ms, P<0.05), and 400 ms cycle lengths (right atrial appendage 270 ms, midlateral right atrial wall 218 ms, P<0.05), but this was not evident in patients with atrial fibrillation. The monophasic action potentials and effective refractory periods at both atrial sites were shorter in the atrial fibrillation patients compared to controls; however, only the effective refractory periods at atrial appendage at 600 ms (atrial fibrillation 210 ms, controls 265 ms, P<0.001), and 400 ms cycle lengths (atrial fibrillation 200 ms, controls 270 ms, P>0.001) reached statistical significance. Effective refractory period dispersion was significantly greater in controls than in patients with atrial fibrillation (cycle length 600 ms: controls 36, atrial fibrillation 13, P=0.01; cycle length 400 ms: controls 54, atrial fibrillation 18, P<0.01). CONCLUSIONS: In patients without a history of atrial fibrillation, the refractory period at the right atrial appendage is significantly longer than at the midlateral right atrial wall. This 'normal' pattern of atrial refractory dispersion is lost in patients with chronic persistent atrial fibrillation, with marked shortening of the effective refractory period at the right atrial appendage. This may explain the high risk of recurrence of atrial fibrillation following successful electrical cardioversion.
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Female sex is a well-recognized, independent risk factor for AF-related stroke and systemic thromboembolism.
“Female sex is a well-recognized, independent risk factor for AF-related stroke13 and systemic thromboemblism.63–65”
From Atrial fibrillation in women: epidemiology, pathophysiology, presentation, and prognosis (2016) · cites this paper as [63]
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- Authors
- Kamalvand, K.
- Affiliations
- Guy's Hospital (GB)
- Corresponding author
- Kamalvand, K
- Venue
- European Heart Journal
- Publisher
- Oxford University Press (OUP)
- Published
- 1999-06
- Volume
- 20
- Issue
- 12
- Pages
- 888-895
- ISSN
- 0195-668X (ISSN-L)
- OpenAlex
- W2059671547
- Cited by
- 47
- References
- 27
- Citations by year
- 2026: 1 · 2022: 1 · 2021: 2 · 2020: 2 · 2019: 2 · 2018: 2 · 2016: 1 · 2015: 1 · 2012: 1
- FWCI
- 3.88
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- European Heart Journal (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Atrial Fibrillation Management and Outcomes
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac Arrhythmias and Treatments
- Keywords
- chronic atrial fibrillation, atrial electrophysiology, effective refractory period, monophasic action potential duration, atrial appendage, electrical cardioversion, atrial fibrillation recurrence, atrial remodeling, ventricular fibrillation risk, sudden cardiac death risk, sudden cardiac arrest
- MeSH terms
- Action Potentials, Adult, Aged, Atrial Fibrillation, Chronic Disease, Female, Heart Atria, Humans, Male, Middle Aged, Refractory Period, Electrophysiological
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