Intracoronary Cryotherapy Effect on Stabilization of Vulnerable Plaque in Patients with (N)STEMI or Unstable Angina

Last updated: January 28, 2025
Sponsor: Cryotherapeutics SA
Overall Status: Active - Recruiting

Phase

N/A

Condition

Coronary Artery Disease

Atherosclerosis

Myocardial Ischemia

Treatment

CryoTherapy System (CTS)

Clinical Study ID

NCT05600088
CT-CD-P03-1
  • Ages > 18
  • All Genders

Study Summary

The POLARSTAR study is an early safety and feasibility study to evaluate the performance and safety of the CryoTherapy System (CTS) for the treatment of coronary plaque lesions that are not obstructing blood flow but are at high-risk of rupture which would cause a major heart attack. The CTS is used to apply local freezing of the lesion using a balloon catheter, controlled by a console that regulates in- and outflow of a cooling agent into the catheter. The treatment is expected to stabilize the lesion, diminishing the risk of rupture. The study will enrol subjects with acute coronary disease who have suitable coronary lesions. Subjects will be followed for 1 year after the CTS treatment. Baseline identification of lesions will be done using Coronary CT-angiography (CCTA), which will be repeated at 3 and 9 months after procedure.

Eligibility Criteria

Inclusion

Inclusion Criteria:

  1. Subject is at least 18 years old.

  2. Subject has acute cardiac pain/angina consistent with acute coronary syndromeeligible for coronary angiography meeting one of the following criteria:

  3. (Non-)ST-segment elevation myocardial infarction ((N)STEMI) with rise/fall ofcardiac enzymes (troponin I or T) with at least one value above the 99thpercentile of the upper reference limit requiring PCI within 72 hours fromdiagnosis

  4. Unstable angina

  5. Successful PCI (defined as diameter stenosis less than 30% and TIMI 3 flow on finalangiography without procedural complication) of the culprit lesion.

  6. Subject has at least one high-risk plaque meeting the criteria below:

  7. Located in a non-culprit vessel,

  8. High-risk plaque lesion on CCTA and at least one of the following features:

  9. Presence of low-attenuation plaque (HU<50) and/or

  10. Positive remodelling (remodelling index >1.1) and/or

  11. Napkin ring sign and/or

  12. Plaque burden ≥70%

  13. Lesion length ≤ 20 mm.

  14. Diameter stenosis on invasive angiography between 30% and 70% on coronaryangiogram or negative physiology assessment (FFR>0.80 or non-hyperemic pressureratios (NHPR) >0.89).

  15. Reference vessel diameter (RVD) < 3.75 mm and > 2.00 mm in diameter

  16. Investigator considers that lesions are accessible.

  17. If more than two suitable lesions available, investigator will select the mostappropriate lesion for cryotherapy treatment.

  18. Subject is able to provide consent and has signed and dated the informed consentform.

Exclusion

Exclusion Criteria:

  1. Subject is hemodynamically unstable (cardiogenic shock, hypotension needinginotropes, hypoxia needing intubation, refractory ventricular arrhythmias, andIABP).

  2. Subject has ongoing ST-segment elevation myocardial infarction.

  3. Subject had a procedural complication during the Acute coronary syndrome (ACS) PCIprocedure.

  4. Subject has history of Coronary Artery Bypass Graft (CABG) or planned CABG within 12months after the index procedure.

  5. Subject has known reduced Left Ventricular Ejection Fraction < 30%.

  6. Subject has known severe valvular heart disease.

  7. Subject has known severe renal insufficiency (eGFR <30 ml/min/1.72 m2).

  8. Subject has any life-threatening conditions or medical comorbidity resulting in lifeexpectancy < 12 months.

  9. Subject is currently participating in another clinical investigation that has notyet reached its primary endpoint.

  10. Subject is pregnant or lactating, or NOT surgically sterile (tubal ligation orhysterectomy) or NOT postmenopausal for at least 6 months or is a female withchildbearing potential without effective contraception (pill, patch, ring,diaphragm, implant and intrauterine device).

Angiographic exclusion criteria:

  1. Visible distal embolization/no-reflow following culprit lesions PCI.

  2. Left main coronary artery disease (visual diameter stenosis > 50%).

  3. Stent thrombosis/restenosis as a culprit lesion.

  4. CTS lesion involving a bifurcation (defined as lesions involving side branches >2.0mm).

  5. Angiographic or CCTA evidence of severe calcification and/or marked tortuosity ofthe index vessel and/or lesion.

  6. Thrombotic lesions

  7. Ostial lesions

Study Design

Total Participants: 30
Treatment Group(s): 1
Primary Treatment: CryoTherapy System (CTS)
Phase:
Study Start date:
May 18, 2022
Estimated Completion Date:
July 31, 2026

Study Description

The POLARSTAR study is an early feasibility study to evaluate the safety and performance of the CryoTherapy System (CTS) medical device, consisting of a console and a balloon catheter. The CTS is designed to deliver local cryo-energy to vulnerable plaque lesions in the coronary arteries, aiming to stabilize the plaque to reduce the risk of rupture and subsequent cardiac events. The study will enrol up to 10 subjects with NSTEMI or unstable angina, who underwent successful Percutaneous Coronary Intervention (PCI) of their culprit coronary lesion, and who were identified to have presence of at least 1 non-culprit suitable plaque lesion at high-risk of rupture. After providing informed consent the subjects will undergo a Coronary CT-angiography (CCTA) to confirm suitability of the coronary plaque lesion. A single high-risk plaque lesion will be treated by the investigators, with Intra-vascular Ultrasound (IVUS) imaging prior to and after CTS treatment. Subjects will be followed clinically for up to one year after the CTS treatment, and will have follow-up CCTA assessments at 3 and 9 months post-procedure. Primary endpoint will be Major cardiac events rate at 3 months post procedure.

Connect with a study center

  • Israeli-Georgian Research Clinic Helsicore

    Tbilisi, 0112
    Georgia

    Active - Recruiting

  • Tbilisi Heart Center

    Tbilisi, 0186
    Georgia

    Active - Recruiting

  • Hospital of Lithuanian University of health sciences Kauno Klinikos

    Kaunas, LT-50161
    Lithuania

    Active - Recruiting

  • Klaipèda University Hospital

    Klaipèda, LT-92288
    Lithuania

    Active - Recruiting

  • Vilnius University Hospital Santaros Klinikos

    Vilnius, LT-08661
    Lithuania

    Active - Recruiting

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