NCT04153292 · Edwards Lifesciences
The ENCIRCLE Trial
(ENCIRCLE)
What this study is about
This study will establish the safety and effectiveness of the SAPIEN M3 System in subjects with symptomatic, at least 3+ mitral regurgitation (MR) for whom commercially available surgical or transcatheter treatment options are deemed unsuitable. Following completion of enrollment, subjects will be eligible for enrollment in the continued access phase of the trial.
View original scientific description
This study will establish the safety and effectiveness of the SAPIEN M3 System in subjects with symptomatic, at least 3+ mitral regurgitation (MR) for whom commercially available surgical or transcatheter treatment options are deemed unsuitable. Following completion of enrollment, subjects will be eligible for enrollment in the continued access phase of the trial.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- 18 years of age or older
- NYHA functional class ≥ II
- Per the Heart Team, commercially available surgical or transcatheter treatment options are deemed unsuitable due to clinical, anatomic or technical considerations.
- Subject's heart failure management has been optimized based on subject characteristics and applicable guidelines, and stable for at least 30 days prior to enrollment.
- The subject or subject's legal representative has been informed of the nature of the study, agrees to its provisions and has provided written informed consent.
Exclusion criteria
- Mitral/cardiac anatomy that would preclude appropriate delivery and deployment of the SAPIEN M3 dock or valve
- Inappropriate anatomy for femoral introduction and delivery of the SAPIEN M3 dock and valve
- Presence of any device that will contact or interfere with the SAPIEN M3 System during delivery or after implantation
- Left ventricular ejection fraction \<25%
- Severe right ventricular dysfunction
- Need for aortic, tricuspid or pulmonic valve intervention within the next 12 months
- History of heart transplant
- Cardiac imaging evidence of intracardiac mass, thrombus or vegetation
- Active bacterial endocarditis within 180 days of the procedure
- Hemodynamic instability requiring inotropic or mechanical support within 30 days of the procedure
- Myocardial infarction within 30 days of the procedure
- Clinically significant untreated coronary artery disease requiring revascularization
- Any percutaneous cardiovascular intervention, cardiovascular surgery, or carotid surgery within 30 days of the procedure
- Stroke or transient ischemic attack within 90 days of the procedure
- Irreversible, severe pulmonary hypertension
- Chronic obstructive pulmonary disease requiring home oxygen therapy or chronic outpatient oral steroid use
- Renal insufficiency or receiving renal replacement therapy
- Liver disease
- Planned surgery within the next 12 months
- Inability to tolerate or a medical condition precluding treatment with antithrombotic therapy, including heparin administration during the procedure
- Active infection requiring current antibiotic therapy
- Active SARS-CoV-2 infection (Coronavirus-19 \[COVID-19\]) or previously diagnosed with COVID-19 with sequelae that could confound endpoint assessments
- Leukopenia, anemia, thrombocytopenia, history of bleeding diathesis or coagulopathy or hypercoagulable states
- Refusal of blood products
- Female who is pregnant or lactating
- Estimated life expectancy \<12 months due to non-cardiac conditions
- Participating in another investigational drug or device study that has not reached its primary endpoint
- Subject considered to be part of a vulnerable population
Where
- Huntsville, Alabama
- Phoenix, Arizona
- Tucson, Arizona
- La Jolla, California
- Los Angeles, California
- Orange, California
- San Francisco, California
- Loveland, Colorado
- Delray Beach, Florida
- Gainesville, Florida
- Jacksonville, Florida
- Naples, Florida
And 37 more locations — see the full list below.
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Feb 25, 2026 · Source of record for eligibility and locations