Arrhythmias & electrophysiology
Atrial fibrillation is associated with higher oxygen extraction in the human heart
Authors' conclusion
AF significantly affects myocardial oxygen utilization by reducing both myocardial blood flow and cardiac power, thereby requiring increased oxygen extraction. This 2-hit mechanism-reduced supply and increased demand-highlights the symptomatic challenges in managing AF and emphasizes the need for therapeutic strategies to optimize cardiac physiology in these patients.
Study context
- Population
- Patients undergoing atrial fibrillation (AF) catheter ablation at the University of Washington Medical Center between 2022 and 2024patients undergoing AF catheter ablation
- Participants
- 45 patients
- Exposure
- Presenting rhythm: atrial fibrillation vs sinus rhythm
- Sinus rhythm (SR)n = 27
- AFn = 18
- Outcome
- Myocardial oxygen extraction
Main finding
As reported in the abstract
P = 0.001
Observational data: associations, not effects.
Further findings
Cardiac power · lower in AF
P = 0.004
CS flow · reduced in AF
P = 0.42
Heart rate · increased in AF
P = 0.002
Myocardial oxygen extraction, symptomatic vs asymptomatic patients within the AF group (subgroup)
- Dyspnea: significantly higher in symptomatic patients
- P = 0.048
- Exercise intolerance: significantly higher in symptomatic patients
- P = 0.018
- Palpitations: significantly higher in symptomatic patients
- P = 0.028
- Fatigue: trend
- P = 0.07
Myocardial oxygen extraction, symptomatic vs asymptomatic patients within the SR group (subgroup)
- No significant differences
Multivariable regression for myocardial oxygen extraction
- AF and AF-related symptoms strongly associated with increased myocardial oxygen extraction
Original publication
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