for people ages 18-80 (full criteria)
at San Diego, California and other locations
study started
completion around



Clinical study to evaluate the safety and efficacy of the Adagio AF Cryoablation System (iCLAS™) in the ablation treatment of symptomatic, persistent atrial fibrillation (PsAF). Data will be used to support a pre-market application (PMA)


A staged pre-market, single-arm, clinical study designed to collect acute and long-term safety and efficacy data for the Adagio AF Cryoablation System (iCLAS™). Patient population will consist of symptomatic, persistent AF subjects completing a de novo ablation procedure. Enrollment will be 200 subjects at up to 20 global investigational sites. Subjects will receive an ablation with the ultra-low cryoablation device. Follow-up will include assessment at one, three, six, and twelve months.


Persistent Atrial Fibrillation, Atrial Fibrillation, Adagio AF Cryoablation System (iCLAS™), iCLAS Ablation


You can join if…

Open to people ages 18-80

IC1 Male or female between the ages of 18 and 80 years

IC2 Currently scheduled for an ablation of symptomatic, PsAF defined as continuous AF that is sustained > 7-days and ≤ 12 months and documented by the following: a. Physician's note indicating continuous AF > 7 days and ≤ 12 months, AND b. One of the following: i. 24-hour Holter within 180 days of enrollment showing continuous AF, OR ii. Two electrocardiograms from any forms of rhythm monitoring (e.g., 12-lead ECGs or single lead ECGs) completed ≥ 7 days apart within 180 days of enrollment.

IC3 Refractory to at least one class I or III AAD. (Refractory defined as not effective, not tolerated or not desired)

IC4 Willingness, ability and commitment to participate in baseline and follow-up evaluations for the full length of the study

IC5 Willingness and ability to give an informed consent

You CAN'T join if...

EC 1 In the opinion of the Investigator, any known contraindication to an atrial ablation, TEE, or anticoagulation. Including, but not limited to, the identification of any atrial thrombus or evidence of sepsis

EC 2 Any duration of continuous AF lasting longer than 12-months

EC 3 History of previous left atrial ablation or surgical treatment for AF/AFL/AT

EC 4 Atrial fibrillation secondary to electrolyte imbalance, active thyroid disease, or any other reversible or non-cardiac cause

EC 5 Structural heart disease as described below:

  1. Left ventricular ejection fraction (LVEF) < 40% based on most recent TTE
  2. Left atrial size > 55 mm (parasternal long axis view) documented within 6-months of screening
  3. NYHA Class III or IV heart failure documented within the previous 12-months
  4. An implanted pacemaker or ICD
  5. Previous cardiac surgery, ventriculotomy, or atriotomy (excluding atriotomy for CABG),
  6. Previous cardiac valvular surgical or percutaneous procedure, or prosthetic valve
  7. Interatrial baffle, closure device, patch, or PFO occluder
  8. Presence of a left atrial appendage occlusion device
  9. Presence of any pulmonary vein stenting devices
  10. Coronary artery bypass graft (CABG) or PTCA procedure within 6 months prior to procedure
  11. Unstable angina or ongoing myocardial ischemia
  12. Myocardial infarction within the previous six (6) months prior to procedure
  13. Moderate or severe mitral insufficiency or stenosis based on most recent TTE
  14. Atrial myxoma
  15. Significant congential anomaly

EC 6 BMI > 40

  • BMI >35 and no prior sponsor approval into the study

EC 7 Any previous history of cryoglobulinemia

EC 8 History of blood clotting or bleeding disease

EC 9 History of severe COPD requiring steroid use in the previous 12-months

EC 10 History of severe sleep apnea (AHI > 30) not currently treated with a CPAP machine or other mechanical device

EC 11 Any prior history of documented cerebral infarct including recent TIA (within one year) or systemic embolism (excluding a post-operative DVT)

EC 12 Any prior history or current evidence of hemidiaphragmatic paralysis

EC 13 Pregnant or lactating (current or anticipated during study follow-up)

EC 14 Current enrollment in any other study protocol where testing or results from that study may interfere with the procedure or outcome measurements for this study

EC 15 Any other condition that, in the judgment of the investigator, makes the patient a poor candidate for this procedure, the study or compliance with the protocol (includes vulnerable patient population, mental illness, addictive disease, terminal illness with a life expectancy of less than two years, extensive travel away from the research center, COVID-19 related concerns)


  • University of California San Diego
    San Diego California 92093 United States
  • Banner Health
    Phoenix Arizona 85006 United States


in progress, not accepting new patients
Start Date
Completion Date
Adagio Medical
Study Type
Expecting 200 study participants
Last Updated