SIMPLAAFY Clinical Trial

NCT ID: NCT06521463

Last Updated: 2026-01-12

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

Get a concise snapshot of the trial, including recruitment status, study phase, enrollment targets, and key timeline milestones.

Recruitment Status

ACTIVE_NOT_RECRUITING

Clinical Phase

NA

Total Enrollment

1857 participants

Study Classification

INTERVENTIONAL

Study Start Date

2024-10-01

Study Completion Date

2027-01-31

Brief Summary

Review the sponsor-provided synopsis that highlights what the study is about and why it is being conducted.

The primary objective is to demonstrate the safety and effectiveness of two monotherapy regimens versus dual antiplatelet (DAPT) therapy following post-implant with the WATCHMAN FLX Pro device in a commercial clinical setting.

Detailed Description

Dive into the extended narrative that explains the scientific background, objectives, and procedures in greater depth.

This study is a prospective, randomized, open-label, triple-arm, multi-center trial. Subjects will be randomized 1:1:1 to one of the three therapy arms and remain on treatment through the end of study (12 months):

1. Aspirin only
2. Reduced dose non-vitamin K antagonist (VKA) oral anticoagulant (NOAC)
3. DAPT

Conditions

See the medical conditions and disease areas that this research is targeting or investigating.

Atrial Fibrillation Stroke Bleeding

Study Design

Understand how the trial is structured, including allocation methods, masking strategies, primary purpose, and other design elements.

Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

PREVENTION

Blinding Strategy

SINGLE

Outcome Assessors

Study Groups

Review each arm or cohort in the study, along with the interventions and objectives associated with them.

Aspirin

Aspirin 81-100 mg, daily post implant for duration of the clinical trial

Group Type EXPERIMENTAL

WATCHMAN FLX Pro LAAC Device

Intervention Type DEVICE

WATCHMAN FLX Pro LAAC Device Implantation

Reduced dose non-vitamin K antagonist (VKA) oral anticoagulant (NOAC)

Reduced dose non-vitamin K antagonist (VKA) oral anticoagulant (NOAC) for the first 3 months daily, post implant, followed by aspirin only for the duration of the clinical trial

Group Type EXPERIMENTAL

WATCHMAN FLX Pro LAAC Device

Intervention Type DEVICE

WATCHMAN FLX Pro LAAC Device Implantation

DAPT

DAPT (aspirin 81-100 mg + clopidogrel 75 mg), for the first 6-months daily followed by aspirin only for the duration of the clinical trial

Group Type ACTIVE_COMPARATOR

WATCHMAN FLX Pro LAAC Device

Intervention Type DEVICE

WATCHMAN FLX Pro LAAC Device Implantation

Interventions

Learn about the drugs, procedures, or behavioral strategies being tested and how they are applied within this trial.

WATCHMAN FLX Pro LAAC Device

WATCHMAN FLX Pro LAAC Device Implantation

Intervention Type DEVICE

Other Intervention Names

Discover alternative or legacy names that may be used to describe the listed interventions across different sources.

WATCHMAN FLX Pro Left Atrial Appendage Closure Device

Eligibility Criteria

Check the participation requirements, including inclusion and exclusion rules, age limits, and whether healthy volunteers are accepted.

Inclusion Criteria

* Subject is of legal age to participate in the study per the laws of their respective geography.
* Subject is an acceptable candidate for a WATCHMAN FLX Pro device per the approved Instructions for Use.
* Subject is deemed to be suitable for all protocol defined drug regimens in the control and both test arms.
* The subject or legal representative is able to understand and willing to provide written informed consent to participate in the trial.
* The subject is able and willing to return for required follow-up visits and examinations.

Exclusion Criteria

* Subject's device implant procedure was aborted (i.e., failed implant).
* Subject has a device margin residual leak \> 0mm at time of implant.
* Occurrence of complications (major bleeding, systemic embolism, stroke, pericardial effusion requiring intervention) during the implant procedure, post-procedure, or prior to randomization.
* Subject has a contraindication to one of the three protocol defined drug regimens.
* Subject requires long-term anticoagulation therapy for reason other than AF-related stroke risk reduction or requires chronic P2Y12 inhibitor therapy.
* Subject has known history of severe liver disease including cirrhosis with a Child-Pugh classification C or D.
* Subject with known hypercoagulability disorder, mechanical heart valve, rheumatic heart disease, or recurrent deep vein thrombosis.
* Subject has intracardiac thrombus, LAA sludge, or dense spontaneous echo contrast (SEC) observed during pre-implant imaging.
* Subject has Modified Rankin Score of ≥ 3 at baseline.
* Subject has left ventricular ejection fraction (LVEF) \< 30%.
* Subject with known amyloid cardiomyopathy.
* Platelet count ≤ 100,000 x 109/L.
* Subject has an estimated glomerular filtration rate (eGFR) \< 30 ml/min (chronic kidney disease stage IV or V) or is on dialysis.
* Subject has a stroke (of any cause, whether ischemic or hemorrhagic) within 30 days prior to implant or prior to randomization.
* Subject has a documented myocardial infarction (MI) as either a non-ST elevation MI (NSTEMI) or as an ST-elevation MI (STEMI), with or without intervention, within 30 days prior to implant or prior to randomization.
* Subject had or is planning to have any cardiac or non-cardiac intervention or surgical procedure within 30 days prior to or 6-months after implant (including, but not limited to, cardioversion, percutaneous coronary intervention, cardiac ablation, cataract surgery, etc.).
* Subject has a major bleeding event per International Society on Thrombosis and Haemostasis (ISTH) definitions within the 30 days prior to implant or prior to randomization. Lack of resolution of related clinical sequelae or planned and pending interventions to resolve bleeding/bleeding source are a further exclusion regardless of timing of the bleeding event.
* Subject has an active bleed.
* Subject has a cardiac tumor.
* Subject has signs/symptoms of acute or chronic pericarditis.
* Subject has an active infection.
* There is evidence of tamponade physiology.
* Subject has New York Heart Association Class IV congestive heart failure at the time of implant or prior to randomization.
* Subject is currently enrolled in another investigational study, except if the subject is participating in a mandatory governmental registry, or a purely observational registry with no associated treatment.
* Subject is of childbearing potential and is, or plans to become, pregnant during the time of the study.
* Subject has a documented life expectancy of less than 12 months.
Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

Meet the organizations funding or collaborating on the study and learn about their roles.

Boston Scientific Corporation

INDUSTRY

Sponsor Role lead

Responsible Party

Identify the individual or organization who holds primary responsibility for the study information submitted to regulators.

Responsibility Role SPONSOR

Principal Investigators

Learn about the lead researchers overseeing the trial and their institutional affiliations.

Vivek Reddy, MD

Role: STUDY_CHAIR

Icahn School of Medicine at Mount Sinai

Saibal Kar, MD

Role: PRINCIPAL_INVESTIGATOR

Los Robles Health System

Walid Saliba, MD

Role: PRINCIPAL_INVESTIGATOR

The Cleveland Clinic

Locations

Explore where the study is taking place and check the recruitment status at each participating site.

University of Alabama Birmingham

Birmingham, Alabama, United States

Site Status

Grandview Medical Center

Birmingham, Alabama, United States

Site Status

Phoenix Cardiovascular Research Group

Phoenix, Arizona, United States

Site Status

HonorHealth Heart Group - Shea

Scottsdale, Arizona, United States

Site Status

Tucson Medical Center Healthcare

Tucson, Arizona, United States

Site Status

Arrhythmia Research Group

Jonesboro, Arkansas, United States

Site Status

Mills Peninsula Health Services

Burlingame, California, United States

Site Status

John Muir Medical Center

Concord, California, United States

Site Status

Scripps Memorial Hospital

La Jolla, California, United States

Site Status

Loma Linda University Medical Center

Loma Linda, California, United States

Site Status

St. John's Health Center

Los Angeles, California, United States

Site Status

Santa Barbara Cottage Hospital

Santa Barbara, California, United States

Site Status

Los Robles Hospital & Medical Center

Thousand Oaks, California, United States

Site Status

Cardiology Associates Medical Group

Ventura, California, United States

Site Status

Colorado Heart and Vascular PC

Lakewood, Colorado, United States

Site Status

Medical Center of the Rockies

Loveland, Colorado, United States

Site Status

Hartford Hospital

Hartford, Connecticut, United States

Site Status

Washington Hospital

Washington D.C., District of Columbia, United States

Site Status

Baptist Medical Center

Jacksonville, Florida, United States

Site Status

HCA Florida Mercy Hospital

Miami, Florida, United States

Site Status

Naples Community Hospital

Naples, Florida, United States

Site Status

Sarasota Memorial Hospital

Sarasota, Florida, United States

Site Status

Emory University Hospital

Atlanta, Georgia, United States

Site Status

Georgia Arrhythmia Consultants

Macon, Georgia, United States

Site Status

Wellstar Kennestone Hospital

Marietta, Georgia, United States

Site Status

Memorial Health University Medical Center

Savannah, Georgia, United States

Site Status

Straub Medical Center

Honolulu, Hawaii, United States

Site Status

St. Luke's Boise Medical Center

Boise, Idaho, United States

Site Status

Kootenai Medical Center

Coeur d'Alene, Idaho, United States

Site Status

Evanston Hospital

Evanston, Illinois, United States

Site Status

Midwest Cardiovascular Institute

Naperville, Illinois, United States

Site Status

Advocate Christ Medical Center

Oak Lawn, Illinois, United States

Site Status

Community Heart and Vascular Hospita

Indianapolis, Indiana, United States

Site Status

Mercy Hospital Medical Center

Des Moines, Iowa, United States

Site Status

University of Iowa Hospitals and Clinics

Iowa City, Iowa, United States

Site Status

University of Kansas

Kansas City, Kansas, United States

Site Status

Baptist Health Lexington

Lexington, Kentucky, United States

Site Status

Norton Hospital

Louisville, Kentucky, United States

Site Status

Charlton Memorial

Fall River, Massachusetts, United States

Site Status

University of Massachusetts Memorial Medical Center

Worcester, Massachusetts, United States

Site Status

St. Joseph Mercy Hospital

Ann Arbor, Michigan, United States

Site Status

Henry Ford Hospital

Detroit, Michigan, United States

Site Status

Corewell Health

Grand Rapids, Michigan, United States

Site Status

M Health Fairview St John's Hospital

Maplewood, Minnesota, United States

Site Status

Mayo Clinic Foundation

Rochester, Minnesota, United States

Site Status

Centracare Heart and Vascular Center

Saint Cloud, Minnesota, United States

Site Status

University of Mississippi Medical Center

Jackson, Mississippi, United States

Site Status

North Mississippi Medical Center

Tupelo, Mississippi, United States

Site Status

St. Luke's Hospital of Kansas City

Kansas City, Missouri, United States

Site Status

St. Luke's Hospital

St Louis, Missouri, United States

Site Status

Dartmouth Hitchcock Medical Center

Lebanon, New Hampshire, United States

Site Status

Cooper Hospital - University Medical Center

Camden, New Jersey, United States

Site Status

Virtua Health

Marlton, New Jersey, United States

Site Status

Valley Hospital

Paramus, New Jersey, United States

Site Status

Lovelace Medical Center

Albuquerque, New Mexico, United States

Site Status

Northwell Health

Bay Shore, New York, United States

Site Status

Kaleida Health

Buffalo, New York, United States

Site Status

New York University Medical Center

New York, New York, United States

Site Status

Montefiore Medical Center

The Bronx, New York, United States

Site Status

Carolinas Medical Center

Charlotte, North Carolina, United States

Site Status

Novant Health Presbyterian Medical Center

Charlotte, North Carolina, United States

Site Status

Rex Hospital

Raleigh, North Carolina, United States

Site Status

Wake Medical Center

Raleigh, North Carolina, United States

Site Status

Bethesda North Hospital-Hospital

Cincinnati, Ohio, United States

Site Status

University Hospitals of Cleveland

Cleveland, Ohio, United States

Site Status

Ohio State University Medical Center

Columbus, Ohio, United States

Site Status

Legacy Emanuel Hospital & Health Center

Portland, Oregon, United States

Site Status

Pinnacle Health at Harrisburg Hospital

Harrisburg, Pennsylvania, United States

Site Status

Trident Medical Center

Charleston, South Carolina, United States

Site Status

Prisma Health

Columbia, South Carolina, United States

Site Status

MUSC Health Columbia Medical Center Downtown

Columbia, South Carolina, United States

Site Status

Stern Cardiovascular Foundation

Germantown, Tennessee, United States

Site Status

St. Thomas Heart

Nashville, Tennessee, United States

Site Status

Texas Cardiac Arrhythmia Research

Austin, Texas, United States

Site Status

Memorial Hermann Memorial City Medical Center

Houston, Texas, United States

Site Status

Orion Medical

Houston, Texas, United States

Site Status

Methodist Hospital

San Antonio, Texas, United States

Site Status

Christus Trinity Mother Frances Health System-Hospital

Tyler, Texas, United States

Site Status

St. Mark's Hospital

Salt Lake City, Utah, United States

Site Status

Sentara Norfolk General Hospital

Norfolk, Virginia, United States

Site Status

Chippenham & Johnston-Willis Hospital

Richmond, Virginia, United States

Site Status

Carilion Roanoke Memorial Hospital

Roanoke, Virginia, United States

Site Status

Overlake Hospital Medical Center

Bellevue, Washington, United States

Site Status

University of Washington Medical Center

Seattle, Washington, United States

Site Status

Monongalia General Hospital

Morgantown, West Virginia, United States

Site Status

Bellin Health

Green Bay, Wisconsin, United States

Site Status

Froedtert Memorial Lutheran Hospital

Milwaukee, Wisconsin, United States

Site Status

Countries

Review the countries where the study has at least one active or historical site.

United States

Other Identifiers

Review additional registry numbers or institutional identifiers associated with this trial.

S2508

Identifier Type: -

Identifier Source: org_study_id

More Related Trials

Additional clinical trials that may be relevant based on similarity analysis.