QOL Improvement After Cardioversion of Persistent AF (QOL-CAFRCT) (QOL-CAFRCT)

Quality of Life Improvement After Cardioversion of Persistent AF - A Randomized Sham-Controlled Clinical Trial

Atrial fibrillation (AF) is a type of irregular heart rhythm due to electrical signal disturbances of the heart. It is a very common arrhythmia and the risk of developing AF increases with age and with other risk factors such as diabetes, high blood pressure, and underlying heart disease. The main complications of AF are heart failure and stroke. However, studies have shown that restoration of normal rhythm does not reduce these complications. Rather, these complications are mitigated by controlling the heart rate and using blood thinners to prevent stroke. Symptoms secondary to AF can occur due to the irregular heart rate and poor contraction in the atria, the top chambers of the heart. These symptoms include shortness of breath, fatigue, reduced exercise tolerance, and palpitations. Restoring sinus rhythm can sometimes alleviate these symptoms. Given that studies to date have not shown a difference in hard clinical endpoints between rate and rhythm control strategies, the decision to proceed with rhythm control depends on the patient symptom burden.

Rhythm control strategies in patients with persistent AF include cardioversion back to sinus rhythm with long-term recurrence prevention via anti-arrhythmic drugs (AADs) or catheter ablation. However, many studies of these procedures omit a sham placebo control arm. No atrial fibrillation procedural intervention has been compared to a sham procedure. The cardioversion procedure can easily be compared to a "sham" alternative, as it is non-invasive with an expected response within days-to-weeks. Thus, a cardioversion versus "sham" cardioversion trial will allow us to truly assess the impact of a rhythm-control strategy on QOL. It is hypothesized that cardioversion of atrial fibrillation leads to significant improvement in quality of life (QOL) compared to sham cardioversion.

Understanding the true QOL impact of sinus rhythm restoration in patients with persistent AF is of significant importance in guiding strategies for the management of AF. Hence, by evaluating what the true effect of cardioversion on QOL in this blinded study, we can better understand the role of medical management and AF ablation in our patients and assess resource allocation to these procedures.

Study Overview

• Status: Recruiting
• Conditions: Atrial Fibrillation
• Intervention / Treatment: Procedure: Electrical cardioversion; Other: Sham electrical cardioversion

Detailed Description

The study is a prospective, randomized, single-blinded, sham-controlled trial. All recruited patients will undergo a 4-week pre-cardioversion phase of medical optimization (including anticoagulation assessment/initiation, initiation of Amiodarone at 200mg daily, and rate-control medications targeting a resting heart rate of <100 bpm). An activity monitor is provided to patients to be worn during waking hours for nine days. A baseline echocardiogram is also performed (if not available within previous 6 months) during this pre-cardioversion phase.

One day prior to the day of cardioversion, the patient will have a 12-lead ECG. If the patient is in sinus rhythm (chemical cardioversion due to Amiodarone) they will be exited from the study and referred back to their MRP cardiologist. If the patient is in AF, they will be randomized electronically using web-based software (Dacima, Montreal, Canada) to "shock" or "sham shock". This will not be revealed to investigators and will be put in a closed envelope and questionnaires will be administered.

During the day of the cardioversion procedure, following anaesthesia administration, the unblinded team (non-MRP cardiologist / anesthesiologist will open the envelope indicating which arm the patient has been randomized to. Other members of the team will step out of the room. The unblinded non-MRP cardiologist will call out as per usual "All clear", following which a shock is delivered as per the Ottawa Cardioversion Protocol in the "shock" arm. Otherwise, no shock is delivered in the "sham shock" arm. Following the intervention, telemetry is discontinued by the unblinded team prior to patient restoration of consciousness. The unblinded team in the day unit will refrain from providing the patient with information regarding which arm they were randomized to. For the purpose of the patient chart and related documentation, a standardized template will be provided to document the process but not the actual intervention, as to maintain patient blinding. A patch Holter monitor is to be applied and worn for rest of study (4 weeks).

After 4 weeks post-cardioversion, a blinded healthcare professional will re-administer a series of questionnaires. At the end of the trial (4 weeks), an ECG will be performed and the patients will be unblinded and told their results. A follow-up (telephone or in-person) will be undertaken at 6 weeks with the patients' MRP cardiologist for discussion of further treatment.

• Study Type: Interventional
• Enrollment (Estimated): 100
• Phase: Not Applicable

Contacts and Locations

• Study Contact: Name: Tammy Knight; Phone Number: 19080 613-696-7000; Email: tknight@ottawaheart.ca
• Study Contact Backup: Name: Mouhannad Sadek, MD; Email: msadek@ottawaheart.ca

Study Locations

• Canada
  • Ontario
    • Newmarket, Ontario, Canada, L3Y 2P9
      • Recruiting
      • Southlake Health
      • Principal Investigator: Mouhannad Sadek, MD
      • Contact: Mouhannad Sadek, MD; Phone Number: (905) 895-4521; Email: MSadek@southlake.ca
    • Ottawa, Ontario, Canada, K1Y 4W7
      • Recruiting
      • University of Ottawa Heart Institute
      • Contact: Tammy Knight; Phone Number: 19080 613-696-7000; Email: tknight@ottawaheart.ca
      • Contact: Mouhannad Sadek, MD; Email: msadek@ottawaheart.ca

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Patients age ≥ 18 years
• Persistent atrial fibrillation
• Unknown symptom burden related to AF

Exclusion Criteria:

• Known left-atrial appendage thrombus
• Prior catheter or surgical ablation for AF
• Intolerance or contraindication to Amiodarone
• Contraindication to appropriate anticoagulation
• Patient is included in another randomized clinical trial
• Patient is unable or unwilling to provide informed consent
• Patient with a history of noncompliance with medical therapy
• Patient does not meet all of the above listed inclusion criteria
• Pregnancy (all women of child bearing age and potential will have a negative BHCG test before enrolment)
• Breastfeeding
• Patients for whom the investigator believes that the trial is not in the interest of the patient

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Triple

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: True cardioversion; Following anaesthesia administration, the unblinded team (non-MRP cardiologist / anesthesiologist will open the envelope indicating which arm the patient has been randomized to. Other members of the team will step out of the room. The unblinded non-MRP cardiologist will call out as per usual "All clear", following which a shock is delivered as per the Ottawa Cardioversion Protocol in the 'shock' arm.	Procedure: Electrical cardioversion; Shocks are delivered as per the Ottawa Cardioversion Protocol in the "shock" arm. 1) 200J shock delivered using self-adhesive electrodes in an anteroposterior configuration. 2) 200J shock delivered using self-adhesive electrodes in an anterolateral configuration while applying pressure over the electrodes with disconnected standard handheld paddles. 3) 360J shock delivered using the same technique as in (2). 4) As per the treating physician's discretion.
Sham Comparator: Sham cardioversion; Following anaesthesia administration, the unblinded team (non-MRP cardiologist / anesthesiologist will open the envelope indicating which arm the patient has been randomized to. Other members of the team will step out of the room. No shock is delivered in the "sham" shock arm.	Other: Sham electrical cardioversion; No shock is delivered in the sham procedure arm.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Difference between AFEQT Scores pre and post cardioversion	Atrial fibrillation Quality of Life Survey Patients will be asked: "To help people say how good or bad their state of health has been on average in previous 4 weeks/since intervention we have drawn a scale (rather like a thermometer) on which the best state you can imagine is marked 100 and the worst state you can imagine is marked 0. We would like you to indicate on this scale how good or bad your health has been on average on average in previous 4 weeks/since intervention in your opinion. Please do this by drawing a line on the scale."	4 weeks

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Absolute AFEQT score post-cardioversion	Atrial fibrillation Quality of Life Survey Patients will be asked: "To help people say how good or bad their state of health has been on average in previous 4 weeks/since intervention we have drawn a scale (rather like a thermometer) on which the best state you can imagine is marked 100 and the worst state you can imagine is marked 0. We would like you to indicate on this scale how good or bad your health has been on average on average in previous 4 weeks/since intervention in your opinion. Please do this by drawing a line on the scale."	4 weeks
Change in generic quality of life	Measured using the 36-Item Short Form Survey (SF-36)	4 weeks
Change in daily activity	An activity monitor is provided to participants for the duration of the study. Participants will wear an ActiGraph GTX3 accelerometer (ActiGraph, Pensacola, Florida) over their right hip during waking hours for nine days, excluding periods when they engaged in water-related activities (i.e. bathing, swimming). The ActiGraph GT3X accelerometer will capture movement across three axes (y-, x- and z-axis). Participants' sedentary time, and time spent in low, moderate and vigorous intensity physical activity, expressed as proportion of wear time (minutes/day or minutes/week) of activity. The activity monitor is blinded and does not show the participants any values.	4 weeks
Study exit questionnaire on patient's perceived well-being	Patients will be asked two questions at the end of the study: "Do you feel better after the intervention?" with the answer choices "Yes/No"; "What rhythm do you think you are today" with answer choices "NSR/AF"	4 weeks

Collaborators and Investigators

• Sponsor: Ottawa Heart Institute Research Corporation
• Investigators: Principal Investigator: David Birnie, MD, Ottawa Heart Institute Research Corporation

Study record dates

Study Major Dates

• Study Start (Actual): February 10, 2023
• Primary Completion (Estimated): May 1, 2026
• Study Completion (Estimated): May 1, 2026

Study Registration Dates

• First Submitted: November 12, 2021
• First Submitted That Met QC Criteria: November 25, 2021
• First Posted (Actual): November 29, 2021

Study Record Updates

• Last Update Posted (Estimated): December 15, 2025
• Last Update Submitted That Met QC Criteria: December 5, 2025
• Last Verified: July 1, 2025

More Information

Terms related to this study

• Keywords: Placebo; Electrical cardioversion; Rhythm control; Quality of life improvement; Sham cardioversion
• Additional Relevant MeSH Terms: Cardiovascular Diseases; Pathologic Processes; Heart Diseases; Arrhythmias, Cardiac; Pathological Conditions, Signs and Symptoms; Atrial Fibrillation; Therapeutics; Electric Stimulation Therapy; Electric Countershock
• Other Study ID Numbers: 20210782-01H

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No