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Open research questions in Cardiac Arrhythmias and Treatments

26 unresolved questions extracted from the limitations and future-work sections of 420 Cardiac Arrhythmias and Treatments papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Future progress in VT imaging will likely depend less on identifying entirely new abnormalities and more on improving how consistently existing substrate features are defined, quantified, and interpreted. A major limitation of current imagingbased substrate assessment remains the lack of standardization in acquisition, postprocessing, and threshold definition. This limits comparison across studies and implementation.

    Imaging phenotypes and substrates in ventricular tachycardia · 2026 · DOI

  • The contact index, derived from real‐time impedance rise on the EnSite X mapping system, may provide an objective surrogate for catheter contact; however, its utility with the PulseSelect catheter remains insufficiently defined.

    Contact Index for PulseSelect Catheter Apposition: Validation by Transesophageal Echocardiography · 2026 · DOI

  • There are limited data regarding the effects of cryoablation within ventricular scar tissue, particularly in comparison to the performance of radiofrequency (RF) catheter ablation.

    Comparative performance of open thorax epicardial linear cryoprobe ablation versus focal tip radiofrequency catheter ablation in ventricular scar · 2026 · DOI

  • ABSTRACT Introduction Left atrial (LA) slow‐conduction channels (SCCs) may represent active drivers of persistent AF, but human evidence is lacking.

    Acute Termination of Atrial Fibrillation During Ablation of a Left Atrial Slow‐Conduction Channel · 2026 · DOI

  • The low incidence of arrhythmias necessitating electrical cardioversion or catheter ablation during pregnancy inherently limited the sample size. While this accurately mirrors real-world clinical practice, the interpretation of findings warrants caution due to potential selection bias and the lack of comparator groups. The existing evidence consists of case reports spanning several decades, with the majority published post-2000, and these methodological variations in reporting appear to have minimal impact on primary outcome assessments.

    Efficacy and safety of electrical cardioversion and catheter ablation during pregnancy: a case review and literature analysis · 2026 · DOI

  • The present report has several limitations. First, the inherent limitations and potential biases associated with a single-patient case report are unavoidable. Second, recognition of the limb lead reversal was made retrospectively rather than during the patient’s initial presentation. Third, the currently available follow-up data remain limited to the short term; therefore, longer-term follow-up is warranted to more definitively exclude the possibility of VT.

    An Endless Riddle of Wide Complex Tachycardia: Ventricular Tachycardia (VT) or Supraventricular Tachycardia (SVT)? · 2026 · DOI

  • Given these lead threshold rises were only identified after the procedure, the precise distance between the ablation catheter electrode and the CIED electrode was not mea- sured in any of the 3 cases, hence cannot be accurately pro- vided. As our ablation protocol comprised both RF and PF, neither one can be considered more responsible based on these cases alone, rather the additive effect of greater scar penetrance with dual energy lattice ablation. Post-ablation imaging (e.g. contrast CT or MRI) has not been undertaken to assess local lesion effects. We hope that our cases stimu- late prospective studies to address these unknowns. Author contributions All authors whose names appear on the submis- sion made substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data; drafted the work or revised it critically for important intellectual content; ap- proved the version to be published; and agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. Funding No external funding received. Data availability The data that support the findings of this study are not openly available due to reasons of sensitivity and are available from the corresponding author upon reasonable request. Data are located in controlled access data storage at Liverpool Heart and Chest Hospital NHS Foundation Trust.

    Lattice-tip dual energy ablation creates effective ventricular lesions through transmural scar that might inadvertently increase lead capture thresholds on the opposing surface · 2026 · DOI

  • As a single-case report, the generalizability of these findings is inherently limited. The anatomical variability among Fontan patients and the individualized procedural strategies required pose challenges to establishing uniform ablation protocols. Moreover, long-term arrhythmia-free survival remains to be determined, emphasizing the need for extended follow-up. Procedural success in this case was also facilitated by high operator expertise and advanced imaging capabilities, which may not be universally available in all electrophysiology centers.

    Case Report: Complex atrial arrhythmia ablation with transbaffle puncture in a Fontan patient with intracardiac lateral tunnel anatomy · 2026 · DOI

  • The mechanisms by which snake venom causes atrial fibrillation and other arrhythmias in patients with normal sinus rhythm (as opposed to those with pre-existing AV block) remain unclear.

    Snake Bite and Arrhythmia · 2025 · DOI

  • OBJECTIVES: Catheter ablation of ventricular premature complexes (VPC) improves clinical status and systolic performance of the left ventricle (LV) in a certain subset of patients; however, whether or not VPC ablation is equally effective in younger (<=65 years) and older (>65 years) patients remains unclear.

    Efficacy and benefits of catheter ablation of ventricular premature complexes in patients younger and older than 65 years of age · 2013 · DOI

  • Consequently, dilated cardiomyopathy of unknown origin remains the only causative and definitive diagnosis, while the significance of the genetic findings in this context remains uncertain.

    An unusual case of persistent very low-voltage electrocardiography · 2026 · DOI

  • Careful proximal septal and fascicular mapping is important, while mechanistic conclusions should remain appropriately cautious when definitive circuit evidence is lacking.

    Apparent Unmasking of Left Anterior Fascicular Ventricular Tachycardia After Prior Left Posterior Fascicular Ablation: Possible Alternative Exit From a Shared Septal Purkinje Substrate · 2026 · DOI

  • Pulsed field ablation (PFA) shows promise for complex accessory pathways (APs) but lacks data on oblique courses.

    Case Report: Pulsed field ablation of an oblique inferoparaseptal accessory pathway · 2026 · DOI

  • A major limitation of this report is the absence of invasive electrophysiological confirmation at the time of manuscript preparation.

    A diagnostic challenge of dual atrioventricular nodal nonreentrant tachycardia revealed by ambulatory electrocardiographic monitoring: a case report · 2026 · DOI

  • Standardized protocols for cardiac rhythm monitoring duration and intensity in different stages of snake bite envenomation are not clearly established or validated.

    Snake Bite and Arrhythmia · 2025 · DOI

  • The study evaluated only two snake bite cases; larger sample sizes are needed to establish the prevalence and clinical patterns of cardiac arrhythmias in snake bite envenomation.

    Snake Bite and Arrhythmia · 2025 · DOI

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26 open questions have been extracted from the limitations and future-work passages of 420 Cardiac Arrhythmias and Treatments papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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