We read with interest the article by Crowley et al., “Yoga vs regular exercise for atrial fibrillation: Design of the yoga-AF randomized controlled trial,”. The authors are to be commended for developing a rigorous lifestyle intervention trial in patients with paroxysmal and persistent atrial fibrillation (AF), aiming to evaluate the impact of regular yoga on AF recurrence, AF burden, and autonomic function. The central clinical message that a structured yoga program may modify AF-related outcomes is highly relevant to contemporary AF management.
We would like to raise 3 considerations regarding interpretation of the planned findings. Firstly, the comparator condition may complicate attribution of effects specifically to yoga. The intervention arm receives a funded, supervised yoga program in addition to usual care, whereas the control arm receives standard care with advice to achieve guideline recommended physical activity without structured support. Differences in total exercise dose, supervision, and nonspecific attention could therefore underlie any observed benefit, reflecting the impact of a structured mind–body program rather than yoga per se. Reporting actual physical activity levels (eg, MET-minutes, session counts) and, where possible, adjusting or stratifying by exercise volume would help disentangle these effects.
Secondly, AF monitoring is heterogeneous, spanning implantable loop recorders, ECG-capable smartwatches, and handheld devices. Continuous monitoring is substantially more sensitive for asymptomatic and short AF episodes than intermittent recordings, which depend on patient adherence and timing. Device-related differences in sensitivity and AF burden estimation may introduce measurement bias, particularly for the dual primary endpoints. Sensitivity analyses restricted to participants with continuous monitoring and models explicitly adjusting for monitoring modality will be important for robust inference.
Thirdly, the unblinded design and allowance for postrandomization changes in rhythm-control therapy (antiarrhythmics, cardioversion, ablation) may influence AF outcomes. Symptom perception and expectations could affect both patient-reported outcomes and clinicians’ thresholds for escalating therapy, which in turn strongly impacts AF recurrence and burden. Detailed reporting of rhythm-control interventions by treatment arm, and consideration of these treatments as time-varying covariates or competing events, would aid interpretation.
We again congratulate the authors on this ambitious trial. We hope that clarification of these issues will enhance interpretation of the forthcoming results and help clinicians judge how best to integrate yoga into comprehensive AF care.
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