Antiplatelet Therapy After Successful Percutaneous Coronary Intervention for Chronically Occluded Coronary Artery (DAPT-CTO)

Public Assistance-Hospitals of Marseille (AP-HM)

Status: Not yet enrolling

Conditions: Chronic Total Occlusion

Treatments: Other: Follow-up visit at 1 month; Other: Follow-up visit at 12 months; Procedure: Percutaneous coronary intervention; Other: Long dual Aspirin/Clopidogrel therapy; Drug: Short dual Aspirin/Clopidogrel therapy; Other: Follow-up visit at 6 months

Study type: Interventional

Funder types: Other

Identifiers

NCT06175377

RCAPHM23_0327

Details and patient eligibility

About

Coronary arteries are in charge of oxygen supply for the myocardium. When coronary arteries develop stenosis the coronary blood flow (i.e. oxygen flow) is reduced. Chronic total occlusion (CTO) is the extreme evolution of a coronary stenosis, which ends up to a total vessel closure.

Percutaneous coronary intervention (PCI) is the main treatment for chronic occlusions. The principle of this treatment is to implant a stent covering the whole segment of occlusion and allowing the blood to perfuse the myocardium antegradely and not retrogradely via the collateral(s). This angioplasty and stent implantation requires a dual antiplatelet therapy (aspirin associated with clopidogrel) to prevent a new thrombosis within the newly placed coronary stent.

Following the development of coronary stent (and particularly drug eluting coronary stent) new thrombosis within the implanted coronary scaffold have emerged. Dual antiplatelet therapy (DAPT) (compared to single antiplatelet therapy or anticoagulant) and initially prolonged DAPT (12 months) has offered a preventive treatment for stent thrombosis after PCI.

PCI treatment for CTOs continues to increase in France and around the world, while no dedicated study has been proposed so far regarding DAPT duration. Therefore, the general European recommendations for DAPT in chronic coronary syndrome management guidelines should be applied even though the CTO poses specific technical challenges (long and multiple stenting length for example). Even if 6 months DAPT is recommended as routine duration in chronic coronary syndrome (CCS), longer DAPT (12 months) is possible in this setting. However, the optimal duration of DAPT is not clearly demonstrated on an individual basis and each physician must adapt the DAPT duration for each single patient. A so called "ischemic / bleeding balance "guides the duration of DAPT.

This study would be the first randomized protocol to clarify the efficacy and safety of a shorter DAPT duration in the specific context of CTO PCI. It is conceivable that the technical advances which have made it possible to reduce the duration of DAPT to up to 1 month, in the cases of patients at high risk of bleeding for example, could be applicable to CTO PCI. Therefore, reducing the DAPT to 1 month, in the setting of CTO PCI, could reduce the haemorrhagic risk which should be proportional to the duration of the DAPT. Moreover, the invesitgators will evaluate the safety of short DAPT in terms of ischemic events during follow-up.

Enrollment: 660 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Patients who underwent a successful coronary stent implantation for chronic coronary occlusion, eligible for long-term aspirin therapy and requiring a dual antiplatelet therapy
• Affiliated to Social Security system.
• Signature of informed consent.
• Age > 18 years old.

Exclusion criteria

• Dual antiplatelet therapy contra-indication
• Patient with hypersensitivity to aspirin (or any of its excipients) and/or to any of the active substance or to any of the excipients of the investigational medical product used in this study (clopidogrel);
• Patient with contraindication to aspirin and/or clopidogrel.
• No coronary stent implanted
• Age < 18years
• Patient under guardianship
• Pregnancy or breast feeding
• Prasugrel or ticagrelor use

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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660 participants in 2 patient groups

Long dual Aspirin/Clopidogrel therapy

Active Comparator group

Description:

Patients will be treated with usual long dual antiplatelet aggregation for 6 to 12 months

Treatment:

Procedure: Percutaneous coronary intervention

Other: Follow-up visit at 1 month

Other: Follow-up visit at 12 months

Other: Long dual Aspirin/Clopidogrel therapy

Other: Follow-up visit at 6 months

Short dual Aspirin/Clopidogrel therapy

Experimental group

Description:

Patients will be treated with short dual antiplatelet aggregation for 1month

Treatment:

Procedure: Percutaneous coronary intervention

Other: Follow-up visit at 1 month

Drug: Short dual Aspirin/Clopidogrel therapy