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The CONFORM Pivotal Trial

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. Read our disclaimer for details. Identifier: NCT05147792
Recruitment Status : Enrolling by invitation
First Posted : December 7, 2021
Last Update Posted : March 8, 2024
Information provided by (Responsible Party):
Conformal Medical, Inc

Brief Summary:
The CLAAS® device will be evaluated for safety and efficacy by establishing its performance is non-inferior to the commercially available WATCHMAN® and Amulet™ left atrial appendage closure devices in patients with non-valvular atrial fibrillation. Patients who are eligible for the trial will be randomized to receive either the CLAAS device or the WATCHMAN or Amulet™ devices and will be followed for 5 years after device implant.

Condition or disease Intervention/treatment Phase
Atrial Fibrillation Stroke Device: CLAAS Device: WATCHMAN left atrial appendage closure device / Amulet left atrial appendage occluder Not Applicable

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 1600 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Prevention
Official Title: An Evaluation of the Safety and Effectiveness of the Conformal CLAAS System for Left Atrial Appendage Occlusion
Actual Study Start Date : May 26, 2022
Estimated Primary Completion Date : August 2026
Estimated Study Completion Date : August 2030

Arm Intervention/treatment
Experimental: CLAAS
Transcatheter left atrial occluder
Device: CLAAS

Active Comparator: WATCHMAN / Amulet
Transcatheter left atrial occluder
Device: WATCHMAN left atrial appendage closure device / Amulet left atrial appendage occluder
WATCHMAN left atrial appendage closure device / Amulet left atrial appendage occluder

Primary Outcome Measures :
  1. Procedure-related complications, all-cause death, major bleeding [ Time Frame: 12 months ]
    The primary safety endpoint is a composite of 1) major procedure-related complications including a) cardiac perforation, b) pericardial effusion requiring drainage, c) ischemic stroke, d) device embolization, and e) major vascular complications, or 2) major bleeding, or 3) all-cause death

  2. Ischemic stroke and systemic embolism [ Time Frame: 18 months ]
    The primary effectiveness endpoint is a composite of ischemic stroke and systemic embolism through 18 months.

Secondary Outcome Measures :
  1. All Cause Mortality [ Time Frame: 18 months ]
    A secondary safety endpoint is all-cause mortality including cardiovascular through 18 months

  2. Myocardial Infarction [ Time Frame: 7 days ]
    A secondary safety endpoint is myocardial infarction evaluated through 7 days post-procedure

  3. Neurologic Events [ Time Frame: 45 days ]
    A secondary safety endpoint is neurologic events including stroke (ischemic and hemorrhagic) and TIA

  4. Closure Success [ Time Frame: 12 months ]
    A secondary performance and efficacy endpoint is closure success at 12 months based upon each of the following criteria: a) demonstration of peri-device flow </=5 mm, and b) demonstration of peri-device flow </=3 mm

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

Inclusion Criteria:

  1. Male or non-pregnant female aged ≥18 years
  2. Documented non-valvular AF (paroxysmal, persistent, or permanent)
  3. High risk of stroke or systemic embolism, defined as CHADS2 score of >2 or CHA2DS2-VASc score of ≥ 3
  4. Has an appropriate rationale to seek a non-pharmacologic alternative to long-term oral anticoagulation
  5. Deemed by the site investigator to be suitable for short term oral anticoagulation therapy but deemed less favorable for long-term oral anticoagulation therapy.
  6. Deemed appropriate for LAA closure by the site investigator and a clinician not a part of the procedural team using a shared decision-making process in accordance with standard of care
  7. Able to comply with the protocol-specified medication regimen and follow-up evaluations
  8. The patient (or legally authorized representative, where allowed) has been informed of the nature of the study, agrees to its provisions, and has provided written informed consent approved by the appropriate institutional review board (IRB)/Regional Ethics Board (REB)/Ethics Committee (EC).

Exclusion Criteria:

  1. Pregnant or nursing patients and those who plan pregnancy in the period up to one year following the index procedure. Female patients of childbearing potential must have a negative pregnancy test (per site standard test) within 7 days prior to index procedure.
  2. Anatomic conditions that would prevent performance of an LAA occlusion procedure (e.g., prior atrial septal defect [ASD] or high-risk patent foramen ovale [PFO], surgical repair or implanted closure device, or obliterated or ligated left atrial appendage)
  3. Atrial fibrillation that is defined by a single occurrence or that is transient or reversible (e.g., secondary thyroid disorders, acute alcohol intoxication, trauma, recent major surgical procedures)
  4. A medical condition (other than atrial fibrillation) that mandates long-term oral anticoagulation (e.g., history of unprovoked deep vein thrombosis or pulmonary embolism, or mechanical heart valve)
  5. History of bleeding diathesis or coagulopathy, or patients in whom antiplatelet and/or anticoagulant therapy is contraindicated
  6. Documented active systemic infection
  7. Symptomatic carotid artery disease (defined as >50% stenosis with symptoms of ipsilateral transient or visual TIA evidenced by amaurosis fugax, ipsilateral hemispheric TIAs or ipsilateral stroke); if subject has a history of carotid stent or endarterectomy the subject is eligible if there is <50% stenosis noted at the site of prior treatment
  8. Recent (within 30 days of index procedure) or planned (within 60 days post-procedure) cardiac or non-cardiac interventional or surgical procedure
  9. Recent (within 30 days of index procedure) stroke or transient ischemic attack
  10. Recent (within 30 days of index procedure) myocardial infarction
  11. Vascular access precluding delivery of implant with catheter-based system
  12. Severe heart failure (New York Heart Association Class IV)
  13. Prior cardiac transplant, history of mitral valve replacement or transcatheter mitral valve intervention, or any mechanical valve implant
  14. Renal insufficiency, defined as estimated glomerular filtration rate (eGFR) <30 mL/min/1.73 m2 (by the Modification of Diet in Renal Disease equation)
  15. Platelet count <75,000 cells/mm3 or >700,000 cells/mm3, or white blood cell count <3,000 cells/mm3
  16. Known allergy, hypersensitivity or contraindication to aspirin, heparin, or device materials (e.g., nickel, titanium) that would preclude any P2Y12 inhibitor therapy, or the patient has contrast sensitivity that cannot be adequately pre-medicated
  17. Actively enrolled or plans to enroll in a concurrent clinical study in which the active treatment arm may confound the results of this trial
  18. Unable to undergo general anesthesia
  19. Known other medical illness or known history of substance abuse that may cause non-compliance with the protocol or protocol-specified medication regimen, confound the data interpretation, or is associated with a life expectancy of less than 5 years
  20. A condition which precludes adequate transesophageal echocardiographic assessment

Echo exclusion criteria:

  1. Left atrial appendage anatomy which cannot accommodate a commercially available control device or the CLAAS device per manufacturer IFU (e.g., the anatomy and sizing must be appropriate for both devices to be enrolled in the trial)
  2. Intracardiac thrombus or dense spontaneous echo contrast consistent with thrombus, as visualized by TEE prior to implant
  3. Left ventricular ejection fraction (LVEF) <30%
  4. Moderate or large circumferential pericardial effusion >10 mm or symptomatic pericardial effusion, signs or symptoms of acute or chronic pericarditis, or evidence of tamponade physiology
  5. Atrial septal defect that warrants closure
  6. High risk patent foramen ovale (PFO), defined as an atrial septal aneurysm (excursion >15 mm or length > 15 mm) or large shunt (early [within 3 beats] and/or substantial passage of bubbles, e.g., >20)
  7. Moderate or severe mitral valve stenosis (mitral valve area <1.5 cm2)
  8. Complex atheroma with mobile plaque of the descending aorta and/or aortic arch
  9. Evidence of cardiac tumor

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): NCT05147792

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Sponsors and Collaborators
Conformal Medical, Inc
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Principal Investigator: William Gray, M.D. Lankenau Heart Institute
Principal Investigator: Shephal Doshi, M.D. Pacific Heart Institute
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Responsible Party: Conformal Medical, Inc Identifier: NCT05147792    
Other Study ID Numbers: 21-101
First Posted: December 7, 2021    Key Record Dates
Last Update Posted: March 8, 2024
Last Verified: March 2024
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: Yes
Device Product Not Approved or Cleared by U.S. FDA: Yes
Additional relevant MeSH terms:
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Atrial Fibrillation
Arrhythmias, Cardiac
Heart Diseases
Cardiovascular Diseases
Pathologic Processes