Sedation May Shorten Atrial Fibrillation Ablation Procedures

A systematic review and meta-analysis published in Frontiers in Cardiovascular Medicine suggests that using conscious or deep sedation rather than general anesthesia for pulsed field ablation of atrial fibrillation may reduce overall procedural time without compromising acute success rates or safety. The study, led by researchers from Shanxi Medical University in China, analyzed data from ten clinical studies involving 3,692 patients. The findings indicate that while general anesthesia remains the standard of care to ensure catheter stability, lighter sedation protocols offer a viable alternative that streamlines workflow in cardiac electrophysiology laboratories. This development is significant as pulsed field ablation rapidly emerges as a preferred non-thermal therapy for rhythm control, offering a mechanism that minimizes collateral injury to nearby structures like the esophagus and phrenic nerve.

The primary motivation for this investigation stems from the logistical and physiological burdens associated with general anesthesia. General anesthesia requires mechanical ventilation, specialized anesthesiology staff, and extended recovery periods, which can limit laboratory capacity and increase healthcare costs. In contrast, conscious or deep sedation allows patients to maintain spontaneous ventilation and facilitates faster post-procedural recovery. However, a critical clinical question remained unresolved: whether the high-voltage pulses used in pulsed field ablation, which cause skeletal muscle contractions and pain, could be safely managed under lighter sedation without risking procedural failure or adverse events. Previous studies had explored this question but were limited by small sample sizes and inconsistent findings, necessitating a comprehensive quantitative synthesis of the available evidence.

The researchers conducted a systematic literature search across PubMed, Cochrane Library, and Embase databases up to April 2026, identifying ten eligible studies that compared general anesthesia with conscious or deep sedation during pulsed field ablation. These studies were conducted in various countries, including Italy, Japan, Germany, the UK, the Netherlands, the Czech Republic, and Denmark, as well as in multinational multicenter settings. The included studies comprised nine observational cohorts and one randomized controlled trial, with individual sample sizes ranging from 23 to 1,233 patients. The majority of participants were male, and the studies covered both paroxysmal and persistent forms of atrial fibrillation. The analysis focused on key clinical outcomes, including procedural duration, left atrial dwell time, fluoroscopy time, acute pulmonary vein isolation success rates, and the incidence of adverse events.

The pooled results revealed that patients undergoing pulsed field ablation under conscious or deep sedation experienced a statistically significant reduction in overall procedural time compared to those under general anesthesia. The weighted mean difference was 7.73 minutes shorter in the sedation group, with a 95% confidence interval ranging from 14.17 to 1.29 minutes. This efficiency gain is likely attributable to the avoidance of time-consuming steps inherent to general anesthesia, such as prolonged induction, endotracheal intubation, and post-anesthesia recovery. However, the analysis did not find significant differences in left atrial dwell time or fluoroscopy time between the two groups. This suggests that while the total laboratory occupancy time is reduced, the actual time spent manipulating the catheter within the heart and the use of X-ray imaging remain comparable, indicating that the core ablation procedure itself is not accelerated by the choice of anesthesia.

Regarding efficacy, the meta-analysis found no statistically significant difference in acute pulmonary vein isolation success rates between the sedation and general anesthesia groups. The pooled risk ratio was 1.00, indicating that the ability to successfully isolate the pulmonary veins, which is the primary goal of the ablation, was equally high under both anesthetic strategies. This finding is consistent with the technical properties of pulsed field ablation, which delivers energy in millisecond-level pulses that create lesions rapidly. This ultra-rapid energy delivery may mitigate the impact of minor respiratory fluctuations or transient patient movements that could theoretically compromise catheter stability under sedation. Contemporary three-dimensional electroanatomical mapping systems further support stable map acquisition, allowing for precise targeting of arrhythmogenic foci even without the complete immobility provided by general anesthesia.

Safety profiles were also comparable between the two groups, with no statistically significant difference in the incidence of major adverse events. Major complications, defined as life-threatening or disabling events such as cardiac tamponade, ischemic stroke, or perioperative mortality, occurred at similar rates in both cohorts. The pooled risk ratio for major adverse events was 1.57, but the 95% confidence interval included 1.0, indicating that the difference was not statistically significant. There was a borderline trend toward fewer minor adverse events in the conscious or deep sedation group, with a risk ratio of 0.61 and a p-value of 0.053. Minor events, such as transient non-life-threatening complications, may be less frequent under sedation due to the avoidance of airway trauma associated with endotracheal intubation and the reduction of profound hemodynamic fluctuations often seen with deep general anesthesia.

The study authors acknowledged several limitations that warrant cautious interpretation of the findings. Substantial statistical heterogeneity was observed in the time-based outcomes, likely driven by variations in pulsed field ablation technologies, such as differences between single-shot and point-by-point catheter systems, and varying institutional experience levels. The diverse pharmacological regimens used for sedation across the included studies also contributed to this heterogeneity, making it difficult to isolate the specific effects of individual drug combinations. Furthermore, the majority of the included studies were observational, which inherently introduces the potential for selection bias and confounding by indication. Patients assigned to sedation versus general anesthesia may have differed in unmeasured clinical characteristics, such as baseline frailty or procedural complexity, which could influence outcomes. The lack of long-term follow-up data in the included studies also limits the ability to assess the durability of the ablation and long-term safety profiles.

Despite these limitations, the findings have important implications for healthcare resource allocation and procedural workflow efficiency. In many healthcare systems, access to dedicated anesthesiology support is a key operational constraint that can prolong room turnover times and limit laboratory capacity. Recognizing conscious or deep sedation as a robust, evidence-based alternative to general anesthesia could enhance procedural throughput and resource utilization. This is particularly relevant for high-volume centers and resource-limited environments where anesthesiologist availability may be scarce. Protocol-driven, titrated deep sedation administered by credentialed electrophysiology personnel or specialized anesthesia nursing teams has been shown to be clinically feasible and safe, potentially lowering overall hospitalization costs and facilitating the broader adoption of pulsed field ablation technology.

The authors emphasize that while the current evidence supports the use of conscious or deep sedation for routine pulsed field ablation procedures, large-scale randomized controlled trials are still needed to confirm these findings. Future studies should focus on standardizing sedation protocols and providing detailed reporting of pharmacological regimens to allow for more granular subgroup analyses. Additionally, patient-centered outcomes, such as postoperative nausea and vomiting and patient satisfaction, should be incorporated into future trials to provide a more comprehensive understanding of the benefits of sedation. As pulsed field ablation continues to evolve, optimizing the peri-procedural workflow will be crucial for maximizing its clinical potential and ensuring sustainable implementation across diverse practice settings.

Subject of Research: Efficacy and safety of conscious/deep sedation versus general anesthesia in pulsed field ablation for atrial fibrillation: a systematic review and meta-analysis

Article Title: Efficacy and safety of conscious/deep sedation versus general anesthesia in pulsed field ablation for atrial fibrillation: a systematic review and meta-analysis

Article References: Sun, W., Feng, R., Fu, X., Zhang, N., Sun, M., Guo, M., Gao, J., & Wang, R. (2026). Efficacy and safety of conscious/deep sedation versus general anesthesia in pulsed field ablation for atrial fibrillation: a systematic review and meta-analysis. Frontiers in Cardiovascular Medicine, 13, Article 1933701. https://doi.org/10.3389/fcvm.2026.1933701

Image Credits: AI Generated

DOI: 10.3389/fcvm.2026.1933701

Keywords: Efficacy, safety, conscious, deep, sedation, versus, general, anesthesia, pulsed, field, ablation, atrial