Comparing treatments for acute atrial fibrillation and flutter

Acute Atrial Fibrillation and Flutter Treated Electively - a Randomized Controlled Clinical Trial on the Safety of Elective Management of Acute Atrial Fibrillation and Flutter

Not applicable Interventional Tampere University · NCT04267159

This study is testing two different ways to treat people with sudden atrial fibrillation or flutter in the emergency room to see if a less immediate approach can be done safely.

Quick facts

PhaseNot applicable
Study typeInterventional
Enrollment500 (estimated)
SexAll
SponsorTampere University Academic / other
Locations4 sites (Jyväskylä, Central Finland and 3 other locations)
Trial IDNCT04267159 on ClinicalTrials.gov

What this trial studies

The AFFELECT study evaluates two treatment approaches for patients with acute atrial fibrillation or flutter who require rhythm control. Patients presenting to the emergency department will be randomly assigned to either conventional care, which involves immediate cardioversion, or elective care, where they are discharged after temporary rhythm control is achieved. Follow-up visits with a cardiologist will occur approximately one week after the emergency room visit to assess the effectiveness of the treatment. The goal is to determine if elective treatment can be safely implemented within a short timeframe.

Who should consider this trial

Good fit: Ideal candidates include patients presenting with acute atrial fibrillation or flutter within 48 hours who are in good clinical condition.

Not a fit: Patients with hemodynamic instability or other major acute illnesses may not benefit from this study.

Why it matters

Potential benefit: If successful, this study could provide a safer and more efficient treatment option for patients with acute atrial fibrillation and flutter.

How similar studies have performed: While there have been studies on rhythm control in atrial fibrillation, this specific approach of elective treatment within a short timeframe is relatively novel.

Eligibility criteria

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Patients presenting with acute (\<48hours) atrial fibrillation or atrial flutter to ER
* Planned acute rhythm control for the arrhythmia by the attending physician in ER
* Good perceived health as assessed by attending physician in ER
* Resting heart rate 110bpm or lower before or after adequate rate control therapy

Exclusion Criteria:

* Haemodynamically stable (mean arterial pressure above 60mmHg)
* Need for acute restoration of sinus rhythm due to some other somatic cause
* No other major complicating acute illness (e.g. decompensated HF or acute MI)
* Anticoagulation not safe
* Mechanical heart valve or mitral stenosis
* The need for prolonged (\>24h) hospitalization due to any cause
* Exceptionally high risk for thromboembolic events (e.g. history of thromboembolic stroke regardless of adequate anticoagulation)
* Transesophageal echocardiography contraindicated

Where this trial is running

Jyväskylä, Central Finland and 3 other locations

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.
Conditions Atrial FibrillationAtrial Flutter
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.