Arrhythmias & electrophysiology
Nonspecific Effects in Atrial Fibrillation Ablation: Insights From SHAM-PVI and Other Sham-Controlled Trials, Methodology Corner
Authors' conclusion
These findings provide a practical framework for interpreting AF-burden endpoints and emphasize the importance of sham-controlled trial design in distinguishing lesion-specific therapeutic benefit from nonspecific procedural influences.
Study context
- Population
- Sham-controlled cardiovascular trials with subjective and objective endpoints; framework applied to atrial fibrillation (AF) ablation
- Comparison
- Within-arm change in the sham arm relative to the active arm
- Outcome
- Nonspecific fraction (ƒ) across renal denervation and percutaneous coronary intervention trials
Methodological detailssensitivity modeling
- Sensitivity modeling
Main finding
As reported in the abstract
ƒ range
0.09 to 0.71
Further findings
AF burden in the sham arm of SHAM-PVI (continuous implantable loop recorder monitoring)
- Reduction in AF burden in the sham arm
- 35.0 percentage-point
- ƒ
- ƒ≈0.58
Share of within-ablation AF-burden reduction reflecting nonspecific procedural effects (sensitivity modeling)
- May reflect nonspecific procedural effects
- 25% to 70%
- Lesion-specific AF-burden reduction estimated as (1-ƒ) × observed reduction
Original publication
Nonspecific Effects in Atrial Fibrillation Ablation: Insights From SHAM-PVI and Other Sham-Controlled Trials, Methodology Corner. JACC Adv. Published 20 August 2026. doi:10.
Summarised from the published abstract; every number is checked against it