Background
Although catheter ablation has been shown to be effective in many studies, most have been open-label, meaning that both patients and physicians knew who received the actual treatment. This has raised questions about how much of the benefit could be attributed to a placebo effect, particularly for subjective outcomes such as quality of life and anxiety.
The PFA-SHAM study was designed to evaluate Pulsed Field Ablation (PFA), a newer ablation technology that uses short electrical pulses rather than heat or cold, and compare it with a sham procedure.
Study Design
Researchers enrolled 60 patients with symptomatic atrial fibrillation and significantly reduced quality of life.
Participants were randomly assigned to:
- PFA Group: 30 patients received PFA ablation.
- SHAM Group: 30 patients underwent a procedure that mimicked the treatment but without actual ablation.
Patients were unaware of which group they belonged to.
All participants received an implantable cardiac monitor that continuously tracked heart rhythm for six months.
The primary endpoints were:
- Time to first recurrence of atrial fibrillation or a similar arrhythmia.
- Change in quality of life, measured using an AF-specific questionnaire.
Secondary outcomes included AF burden, anxiety, and depression.
Results
After six months, the differences were striking:
Arrhythmia Recurrence
- Only 2 patients (6.7%) in the PFA group experienced recurrence.
- In the sham group, 25 patients (83.3%) experienced recurrence.
Quality of Life
- Quality-of-life scores improved by an average of 43.9 points in the PFA group compared with 11.3 points in the sham group.
AF Burden
- Patients treated with PFA had substantially less atrial fibrillation during follow-up.
Psychological Well-Being
- Anxiety and depression improved significantly more in the PFA group.
No serious treatment-related complications were reported.
Conclusion
“Although the study is relatively small, it was conducted with great rigor and produced very clear results. Numerous studies over the past 15–20 years have shown that ablation is effective and often superior to medical therapy. However, only a few studies have blinded both patients and outcome assessors.
We know from other treatments that placebo effects can be substantial, particularly when advanced, high-tech procedures are involved. This study strongly reinforces the effectiveness of ablation—and in this case, the relatively new PFA technology—as a treatment for atrial fibrillation.”
Source:PFA-SHAM Study, Circulation, 2026.
Pulsed Field Ablation Versus Sham to Treat Atrial Fibrillation: The PFA-SHAM Randomized Clinical Trial
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