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Open research questions in Cardiac Arrhythmias and Treatments

112 unresolved questions extracted from the limitations and future-work sections of 476 Cardiac Arrhythmias and Treatments papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • However, its effects on adjacent structures, including the sinus node and its arterial supply, remain incompletely understood.

    Transient Sinus Arrest Caused by Coronary Spasm of the Sinus Node Artery After Pulsed-Field Ablation for Superior Vena Cava Isolation: A Case Report · 2026 · DOI

  • Abstract Background The benefit of preemptive mechanical circulatory support (MCS) for ventricular tachycardia (VT) ablation remains unclear.

    Preemptive mechanical circulatory support in ventricular tachycardia ablation: A systematic review and meta-analysis · 2026 · DOI

  • However, the chronic electrophysiological properties of myocardium following extreme cryothermal injury remain incompletely understood.

    Disappearance of Local Ventricular Components during Extrastimulus Pacing after Ultra-low-temperature Cryoablation for Ventricular Tachycardia: A Case Report · 2026 · DOI

  • Pharmacological therapy involves antiarrhythmic and anticoagulant drugs, though data are limited with potential adverse effects.

    Tachyarrhythmias in congenital heart disease · 2024 · DOI

  • However, the association between chemotherapeutic agents and atrioventricular re-entrant tachycardia (AVRT)/atrioventricular node re-entrant tachycardia (AVNRT) remains poorly understood.

    Atrioventricular re-entrant tachycardia and atrioventricular node re-entrant tachycardia in a patient with cancer under chemotherapy: a case report and literature review · 2024 · DOI

  • Atrial arrhythmias remain a frequent late complication in patients with Fontan physiology. There is a need for effective and safe treatment strategies for these patients.

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

  • Further investigation is warranted to validate the novel parameter delta between the first deflection and peak frequency. The use of peak frequency mapping in other types of arrhythmias needs to be explored. The combination of peak frequency analysis with other tools, such as ILAM and voltage mapping, needs to be further studied.

    From signal analysis to clinical practice: the use of peak frequency in mapping and ablation · 2026 · DOI

  • Conventional approaches for distinguishing near-field from far-field activity have limitations in complex or fractionated electrograms. There is a need for a complementary tool to conventional mapping strategies. The effectiveness of peak frequency algorithms based on time-frequency analysis needs to be evaluated.

    From signal analysis to clinical practice: the use of peak frequency in mapping and ablation · 2026 · DOI

  • The study notes that PSVT can present with various symptoms, making diagnosis challenging. The study also notes that the actual burden of PSVT is likely underreported. The study identifies a challenge in treating PSVT, including the need for effective treatment strategies.

    A retrospective observational study of clinical presentation and management outcomes in patients with paroxysmal supraventricular tachycardia at a tertiary center in Bahrain · 2026 · DOI

  • The risk of coronary injury with RFA. The complexity of accessory pathways. The need for effective and safe treatment protocols.

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

  • There is a lack of data on the use of PFA for oblique inferoparaseptal APs. Randomized trials are needed to compare PFA to RFA.

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

  • The paper identifies a gap in the diagnosis of DAVNNT, which can be overlooked due to its variable electrocardiographic manifestations. The paper notes that prior cases have emphasized invasive electrophysiological confirmation and catheter ablation, but ambulatory monitoring can also be used to diagnose DAVNNT.

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

  • The paper notes that the evidence supporting most of the techniques reviewed is limited. The authors highlight the need for clinical data on the practical and safe creation of lesions. The paper also mentions the limitations of small sample sizes and the reliance on fluoroscopy and tactile feedback for catheter contact assessment in some studies.

    Ablation Methods and Catheter Settings for Ventricular Tachycardia Ablation: A Bench to Bedside Review: Part 1 · 2026 · DOI

  • The paper identifies a gap in the understanding of optimal ablation indices for VT ablation. The authors highlight the need for clinical data on the practical and safe creation of lesions. The paper emphasizes the importance of developing integrated, metric-driven technologies for VT ablation.

    Ablation Methods and Catheter Settings for Ventricular Tachycardia Ablation: A Bench to Bedside Review: Part 1 · 2026 · DOI

  • There is a need for more effective and safe treatments for ventricular tachycardia. Conventional radiofrequency energy has limitations in tissue penetration. The lattice-tip catheter is a new technology that addresses this gap.

    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

  • 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

  • The risk of diaphragmatic injury with conventional energy sources. The need for alternative energy sources that can reduce collateral damage and diaphragmatic injury. The challenge of ablating atrial tachycardia in phrenic-adjacent regions.

    Focal pulsed field ablation for atrial tachycardia near the phrenic nerve: a two-case experience · 2026 · DOI

  • The study presents only two case studies. The follow-up period is limited to 3 months. The study does not compare the outcomes of focal PFA with conventional thermal ablation.

    Focal pulsed field ablation for atrial tachycardia near the phrenic nerve: a two-case experience · 2026 · DOI

  • The lack of formally established guidelines or findings to aid in the diagnosis of VT versus SVT with aberrancy. The limitations of ECG-based algorithms in distinguishing VT from SVT with aberrancy.

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

  • The paper identifies a gap in the awareness of structural cardiac pathology as a potential cause of pacemaker placement failure. The authors highlight the challenges of diagnosing structural cardiac pathology in the emergency department.

    Emergency Department Transvenous Pacemaker Placement Complicated by Tricuspid Mass · 2026 · DOI

  • Epicardial ablation at the site of origin is frequently limited by proximity to the coronary arteries. The presence of cardiac scar may affect procedural outcomes and complications. The management of patients with epicardial PVCs and cardiac scar is challenging.

    Catheter ablation of epicardial premature ventricular complexes in patients with and without cardiac scar · 2026 · DOI

  • The study is limited by its retrospective design and small sample size. The study only includes patients with preprocedural LGE-CMR imaging. The study does not report on long-term follow-up or outcomes.

    Catheter ablation of epicardial premature ventricular complexes in patients with and without cardiac scar · 2026 · DOI

  • The condition is rare and not well understood. The case presents a unique combination of cardiac abnormalities that can inform clinical decision-making.

    Left atrial isomerism, L-looped single ventricle and conduction disorders · 2026 · DOI

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112 open questions have been extracted from the limitations and future-work passages of 476 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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