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Predicting Development of SCAF in Device Patients

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT02808260
Recruitment Status : Recruiting
First Posted : June 21, 2016
Last Update Posted : April 13, 2023
Genome Canada
Information provided by (Responsible Party):
Ottawa Heart Institute Research Corporation

Brief Summary:

Atrial fibrillation (AF) often starts with short episodes of rapid irregular heartbeats that are only detected by implanted pacemakers or defibrillators. Usually people don't know that they have these episodes. Over time, these episodes can happen more often and last for longer periods. In some people, the heart eventually remains permanently in a fast irregular rhythm, known as atrial fibrillation. This condition can lead to strokes and blood clots. If physicians could detect atrial fibrillation at a very early stage they could treat people early and possibly prevent the condition from becoming permanent. People with implanted devices allow a unique opportunity to constantly monitor the heart rhythm so investigators can detect any irregularities immediately.

Investigators don't know which people are at risk of developing short episodes of fast irregular heartbeats that can lead to atrial fibrillation. The purpose of this study is to find out if there are proteins or chemical changes in the blood that can predict the risk of developing atrial fibrillation. These chemical changes, also known as biomarkers, may also be able to give investigators other clues about atrial fibrillation.

Condition or disease
Atrial Fibrillation

Detailed Description:

Atrial fibrillation (AF) is considered to be a progressive condition that starts with episodes of paroxysmal AF (short runs of AF), progresses to persistent AF (can be reverted to normal rhythm) and eventually to permanent AF. More than 25% of people with paroxysmal AF will go on to develop persistent or chronic atrial fibrillation. The progression rate is around 5% per annum. AF can result in devastating outcomes such as stroke/TIA and systemic embolic events. In people with implanted devices such as ICDs, investigators can detect non-symptomatic rapid atrial arrhythmia, known as subclinical atrial fibrillation (SCAF), before it becomes symptomatic. In the ASSERT trial, SCAF was detected in 10% of patients with newly implanted devices within the first 3 months. Of these, nearly 16% developed clinical atrial fibrillation within 2.5 years vs 3% in those who did not exhibit SCAF within the first 3 months. During the follow up period, a further 24.5% of patients developed SCAF. People with SCAF also had a higher risk of stroke and systemic embolism.

Earlier diagnosis and treatment of AF may lead to better prevention and outcomes. The availability of serum based biomarkers that can predict the early onset of atrial fibrillation, may help in the identification of patients at risk for developing AF early. This would also allow the identification of the patient population most suitable for the evaluation of possible future intervention strategies to prevent the onset of atrial fibrillation, and alter its natural history and complications.

In this study investigators will study patients that have a permanent pacemaker or defibrillator implanted. These devices continuously monitor the patient's heart rhythm, detecting any irregularities. Patients with these devices are followed up in outpatient clinics on a regular basis. The information from the devices is downloaded at each follow up visit and analyzed by staff in the clinic.

Investigators will recruit patients for this study after the device was implanted. After obtaining consent, investigators will collect a blood sample for measuring biomarkers. They will interview the participant in regards to previous health history, smoking, alcohol consumption, family history and current medications. Participants' medical records will be reviewed annually for the next 10 years, to monitor for any irregular heart rhythms, hospitalizations and death.

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Study Type : Observational
Estimated Enrollment : 500 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: Predicting Development of Sub-Clinical Atrial Fibrillation in Device Patients
Actual Study Start Date : September 1, 2022
Estimated Primary Completion Date : September 2034
Estimated Study Completion Date : September 2034

Resource links provided by the National Library of Medicine

Primary Outcome Measures :
  1. The development of new Sub-Clinical Atrial Fibrillation as recorded on implanted devices [ Time Frame: 11 years ]
    Participants will be monitored by clinical follow up for a year and then medical record reviews for an additional 10 years

  2. Sub-clinical Atrial Fibrillation as predicted by biomarkers [ Time Frame: 11 years ]
    Biomarkers will be measured at baseline and after 1 year to see if biomarkers can predict which people will develop sub-clinical atrial fibrillation during the 11 year follow up period

Secondary Outcome Measures :
  1. The development of clinical atrial fibrillation, including persistent atrial fibrillation. [ Time Frame: 11 years ]
    The investigators will monitor participants to see how many develop persistent atrial fibrillation within 11 years of device implant

Biospecimen Retention:   Samples Without DNA
Blood samples will be collected for the measurement of biomarkers

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Probability Sample
Study Population
Investigators will recruit patients with a permanent defibrillator or pacemaker who have an upcoming appointment at the Device Clinic.

Inclusion Criteria:

• Dual chamber permanent pacemaker or defibrillator implanted within previous 10 years

Exclusion Criteria:

  • Clinical atrial fibrillation documented by surface ECG (12 lead ECG, Telemetry, Holter)
  • Participants considered by the investigator to be unsuitable for the study for the following reason: life expectancy less than 2 years due to concomitant disease
  • Participants who are pregnant or breast-feeding
  • Congenital heart disease
  • Inherited arrhythmia syndrome, i.e. Brugada, long QT interval

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT02808260

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Contact: Tammy Knight 613-696-7000 ext 19080

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Canada, Ontario
University of Ottawa Heart Institute Recruiting
Ottawa, Ontario, Canada, K1Y 4W7
Contact: Tammy Knight    613-696-7000 ext 19080   
Sponsors and Collaborators
Ottawa Heart Institute Research Corporation
Genome Canada
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Principal Investigator: Pablo Nery, MD Ottawa Heart Institute Research Corporation
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Responsible Party: Ottawa Heart Institute Research Corporation Identifier: NCT02808260    
Other Study ID Numbers: 20160338
First Posted: June 21, 2016    Key Record Dates
Last Update Posted: April 13, 2023
Last Verified: April 2023
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No
Keywords provided by Ottawa Heart Institute Research Corporation:
sub-clinical atrial fibrillation
implanted pacemaker or defibrillator
Additional relevant MeSH terms:
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Atrial Fibrillation
Arrhythmias, Cardiac
Heart Diseases
Cardiovascular Diseases
Pathologic Processes