protocolSection identificationModule nctId: NCT06323499, orgStudyIdInfo id: UK Essen, briefTitle: Outcome of Induced Atypical Atrial Flutter, statusModule overallStatus: COMPLETED, startDateStruct date: 2018-04-01, primaryCompletionDateStruct date: 2021-10-31, completionDateStruct date: 2021-10-31, studyFirstPostDateStruct date: 2024-03-21, lastUpdatePostDateStruct date: 2024-04-24, sponsorCollaboratorsModule leadSponsor name: University Hospital, Essen, class: OTHER, descriptionModule briefSummary: Background: Atypical atrial flutter (AAF) is an increasingly relevant clinical problem. Despite advancements in mapping and ablation techniques, the general management of these patients remain challenging especially when mapping cannot be performed during ongoing arrhythmia. There are no data whether induction of AAF is a feasible approach in these cases.Methods: The investigators retrospectively analyzed patients who underwent catheter ablation of AAF and compared procedural results between patients with ongoing tachycardia when starting the procedure and patients with induced AAF.For this retrospective study, the investigators analyzed patients undergoing ablation of AAF between April 2018 and January 2021 that were identified from the ablation database at the West German Heart and Vascular Center, Essen. All patients were followed up in the outpatient clinic as part of the clinical standard routine or contacted by telephone to assess the occurrence of clinical recurrence of any arrhythmia. In case the documentation was not performed at the institution, relevant documents and ECGs were requested and reviewed.This single-center cohort study was conducted at the University Hospital Essen, Germany, in accordance with the Declaration of Helsinki and its amendments and was approved by the institutional review board of the University of Essen (number 21-10341-BO). Written informed consent was obtained from all study participants.The primary study endpoint was to evaluate the outcome of patients with induced AAF in comparison to patients with ongoing AAF when starting the procedure. Furthermore, the investigators analyzed the type of recurrence during follow-up as well as the occurrence and results of repeat ablations at the institution. The investigators also evaluated if the recurrent AAF form was the same or de-novo compared to the AAF during previous procedure., conditionsModule conditions: Tachyarrhythmia, conditions: Atypical Atrial Flutter, conditions: Induction of Arryhthmia, conditions: Clinical Outcome, designModule studyType: OBSERVATIONAL, designInfo observationalModel: CASE_CONTROL, timePerspective: RETROSPECTIVE, enrollmentInfo count: 76, type: ACTUAL, armsInterventionsModule interventions name: Induction of atypical atrial flutter, outcomesModule primaryOutcomes measure: Outcome of patients with induced AAF in comparison to patients with ongoing AAF when starting the procedure., secondaryOutcomes measure: Type of recurrence during follow-up, secondaryOutcomes measure: Occurrence and results of repeat ablations at our institution, eligibilityModule sex: ALL, minimumAge: 18 Years, stdAges: ADULT, stdAges: OLDER_ADULT, contactsLocationsModule locations facility: University Hospital Essen, city: Essen, state: Nordrhein-Westfalen, zip: 45147, country: Germany, geoPoint lat: 51.45657, lon: 7.01228, hasResults: False