Letter to Editor: Periprocedural Risk Factors for Early Incident Acute Heart Failure After Catheter Ablation of Atrial Fibrillation: Findings From the CLAPHAF Study

I read with great interest the study by Patel and colleagues, titled “Periprocedural Risk Factors for Early Incident Acute Heart Failure After Catheter Ablation of Atrial Fibrillation: Findings From the CLAPHAF Study” [1], published in the Journal of Cardiovascular Electrophysiology. The authors are to be commended for their multicenter investigation into predictors of acute heart failure following AF ablation. Their focus on modifiable procedural factors, especially intravenous fluid management, provides valuable clinical insights. However, the study has the following limitations. First, the study did not include echocardiographic assessment of diastolic function, which is essential for evaluating left atrial compliance and predisposition to postablation heart failure. Without these indices, the ability to identify true mechanistic predictors of heart failure—beyond intravascular fluid status—is limited. For instance, Rosenberg and Manning [2] demonstrated that diastolic dysfunction independently predicts atrial fibrillation and heart failure, highlighting its crucial role in atrial remodeling outcomes. Second, a key limitation of the study is the absence of procedural standardization among participating centers and operators. Variations in ablation techniques, fluid management, and anesthesia practices may have introduced heterogeneity affecting outcome consistency. Such variability can obscure true associations between periprocedural parameters and postablation heart failure. For instance, Andrade et al. [3] demonstrated that operator and institutional differences significantly influence atrial fibrillation ablation outcomes. Third, the study's 30-day follow-up focused only on early postablation outcomes, overlooking delayed or sustained heart failure manifestations. This short observation window may underestimate the true incidence and progression of heart failure, as atrial remodeling and inflammatory responses extend beyond 30 days. For instance, Lim et al. [4] demonstrated that postablation inflammatory, myocardial injury, and prothrombotic responses persist for several weeks, influencing long-term cardiac function. Lastly, a notable limitation of the study is the exclusion of cryoablation and pulsed field ablation techniques, focusing solely on radiofrequency ablation. This limits external validity, as fluid requirements, myocardial injury patterns, and hemodynamic responses differ across ablation modalities. For instance, Miyazaki et al. [5] demonstrated significant differences in early recurrence and procedural effects between radiofrequency and second-generation cryoballoon ablation, highlighting modality-specific risk profiles that may influence postprocedural outcomes. Thus, future studies should incorporate comprehensive echocardiographic assessment, including diastolic function and left atrial compliance, to better identify mechanistic predictors of postablation heart failure. Standardized procedural protocols across centers, extended follow-up beyond 30 days, and inclusion of diverse ablation modalities such as cryoablation and pulsed field ablation will enhance outcome consistency, generalizability, and clinical relevance, enabling more precise identification of modifiable periprocedural risk factors. In conclusion, Patel et al. [1] offer important insights into periprocedural factors affecting early acute heart failure after AF ablation, particularly fluid management. Addressing limitations such as lack of diastolic assessment, procedural variability, short follow-up, and limited ablation modalities in future studies will strengthen findings and improve their clinical relevance. All the authors meet the ICMJE authorship criteria and have made significant and equal contributions to this manuscript. All authors approved the final version and agree to be accountable for all aspects of the work, ensuring the accuracy and integrity of the data and interpretation. Artificial intelligence tools, such as ScholarAI, were utilized to assist in literature search, language refinement, and reference organization. No generative AI was used for idea creation, data interpretation, or authorship. All intellectual content, analysis, and conclusions were solely developed by the authors. The authors take full responsibility for the integrity and originality of the manuscript. All authors have read and approved the final version of the manuscript. They take complete responsibility for the data's integrity and the data analysis's accuracy. The authors affirm that this manuscript is an honest, accurate, and transparent account of the study being reported, that no important aspects of the study have been omitted, and that any discrepancies from the study as planned (and if relevant, registered) have been explained. The authors have nothing to report. The authors declare no conflicts of interest. Data sharing does not apply to this article as no data sets were generated during the current study; all data were sourced from published literature.