Abstract
Atrial fibrillation (AF) is the most frequent sustained arrhythmia and a major cause of morbidity and mortality. Increasing physical activity has convincingly shown to reduce the risk of AF. However, repetitive bouts of prolonged and vigorous endurance exercise have recently emerged as a risk factor for AF in middle-aged male athletes. Thus, a growing body of literature supports a U-shaped relation between lifetime-accumulated high-intensity endurance training and AF in men. The pathophysiology underlying this relation poses a puzzling question with multiple hypothesized mechanisms, which probably in combination create the necessary substrate and trigger for AF onset. Presumably adaptive atrial changes secondary to long-standing endurance training as part of the “athlete’s heart” add special considerations as they build up a grey zone of diagnostic uncertainty with atrial changes seen in individuals with AF. Evolving functional diagnostic modalities may re-shape this diagnostic grey zone and facilitate diagnostic workup. Initiating management of AF requires documentation of an AF episode, which can be challenging in athletes as it usually occurs intermittent. New wearable devices hold promise to facilitate early documentation and follow-up, but their reliability still has to be established, especially during exercise. When counseling competitive athletes and highly active people regarding treatment options of AF, special considerations should be taken into account to reduce risk associated with AF but also sustain the numerous health benefits of regular exercise and the lifestyle of being a competitive endurance athlete.
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1.1 Questions
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1.
Regarding the prevalence and relative risk of AF in endurance athletes, which of the following statements is true?
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(a)
The prevalence of AF is decreasing in the general population and is projected to further decrease in the next decades.
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(b)
The prevalence of AF is higher within a middle-aged cohort of male individuals practicing long-term and vigorous endurance activities compared to the general population.
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(c)
Even endurance activities with moderate intensity increase the risk for AF.
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(d)
Increased AF risk with increasing number of vigorous endurance activities applies similarly in women and men.
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(e)
There is a well-established cutoff where the risk for AF in endurance athletes increases.
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(a)
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2.
Regarding the mechanisms of AF in endurance athletes, which of the following statements is true?
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(a)
Functional assessment of the LA holds promise to identify endurance athletes at risk of developing AF.
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(b)
There is no link between atrial inflammation and atrial fibrosis.
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(c)
Regular endurance activities do not promote resting cardiac autonomic activity changes.
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(d)
There is no evidence for a genetic component of AF.
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(e)
LA dilatation has the same prognostic implications among endurance athletes and non-athletes.
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(a)
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3.
Regarding the therapeutic approach to patients with AF, which of the following statements is not true?
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(a)
Athletes willing to remain competitive may opt for a rhythm control approach to preserve their physical performance.
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(b)
In athletes less than 65 years old who have no other comorbidities, planned cardioversion can be safely performed without anticoagulation.
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(c)
The pill-in-the-pocket approach should be considered in those athletes with infrequent AF recurrences.
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(d)
Although plausible, clinical evidence for a deconditioning benefit on AF burden is scarce.
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(e)
Amiodarone should be considered a second-line option because of its systemic side effects.
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(a)
1.2 Answers
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1.
Answer b is correct: There is mounting evidence that middle-aged male endurance athletes are at increased risk for AF compared to sedentary individuals.
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2.
Answer a is correct: New imaging technologies as speckle tracking echocardiography give detailed insights in phasic atrial function and hold promise to identify endurance athletes at risk of developing AF.
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3.
Answer b is not correct: Although athletes with AF usually are at a low thromboembolic risk (i.e., low CHA2DS2VASc score), peri-procedural anticoagulation should be administered when undergoing cardioversion or AF ablation.
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Sareban, M., Guasch, E., Mont, L. (2020). Endurance Exercise and Atrial Fibrillation. In: Pressler, A., Niebauer, J. (eds) Textbook of Sports and Exercise Cardiology. Springer, Cham. https://doi.org/10.1007/978-3-030-35374-2_33
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