Morphological Parameters of In-stent RESTenosis Assessed and Identified by OCT
- Conditions
- In-stent Restenosis
- Interventions
- Device: Optical Coherence Tomography (OCT)
- Registration Number
- NCT04268875
- Lead Sponsor
- University Hospital, Clermont-Ferrand
- Brief Summary
The statistical risk of intrastent stenosis has fallen considerably with the emergence of latest generation coated stents (drug-eluting stents: DES). The number and clinical lifespan of stents implanted over the last twenty-five years, however, explain the fact that restenosis remains a not unusual clinical problem which is expressed as a recurrence of angina or of an acute coronary syndrome (ACS).
The mechanisms involved in this restenosis are multifactorial in nature and differ depending on the type of stent and the time since the restenosis occurred. In symptomatic stent restenosis (angina or acute coronary syndrome), a further angioplasty is usually required, occasionally on an emergency basis. Coronary angiography is often not capable of explaining the mechanical causes of this complication.
Optical coherence tomography (OCT), a high-resolution endocoronary imaging technique can assist in the understanding of the mechanism of restenosis and guide treatment. OCT during angiography provides a detailed analysis of the stents and potential complications: the presence of neoatherosclerosis with or without plaque rupture, intimal hyperplasia, stent under-deployment, stent fracture and distal or proximal progression of the atherosclerosis.
The investigators propose a prospective, multicentre study of all cases of intrastent restenosis, examined by angiography, causing clinical features involving stable angina and acute coronary syndrome. The coronary artery involved will be routinely studied by OCT for a mechanical cause of the intrastent restenosis. The routine use of intrastent OCT may assist in the understanding of causes of restenosis and in the decision on appropriate treatment. There are several possible treatments for restenosis, including balloon angioplasty, coated balloon angioplasty, stenting or aorto-coronary bypass graft surgery.
- Detailed Description
All stented coronary artery patients hospitalised for stable angina or an ACS requiring a further coronary angiogram (regardless of time since implantation or type of the initial stent) identified to have intrastent restenosis during coronary angiography will be included after being informed and obtaining their informed written consent.
* For cases of stable angina the OCT the will be performed immediately with insertion of the probe distal to the area being studied and then automatic retraction of the fibre during injection of the contrast medium.
* For ACS, the OCT will be performed immediately or on a deferred basis at the discretion of the operator.
* For critical lesions which prevent the OCT fibre passing across the lesion, "soft" predilatation with a 2 mm or smaller balloon is permitted.
* Practical conduct of the OCT:
* Pullback at baseline state and analysis of the stent with a 5 mm margin proximal and distal to the lesion.
* OCT analysis: under-deployment of the stent (expansion \< 80% of the reference mean surface area), neoatherosclerosis with or without rupture, homogeneous or non-homogeneous hyperplasia, stent fracture and proximal or distal progression of the atherosclerosis.
* Final pullback in cases of a new angioplasty (balloon angioplasty, angioplasty with a coated balloon or stenting).
* The OCT investigations will be anonymised and registered in their original format with a view to centralised reading (Corelab ISIT, UMR 6284-CNRS, Clermont-Ferrand University).
* The angiography records will be submitted for reading by a panel blinded to the OCT for the purposes of demonstrating the added value of OCT in the fine details of diagnosis and the impact of a treatment decision. The angiograms will be reviewed in a centralised analytical laboratory, which will re-read the procedures blind.
* Patients will be followed up via telephone contact or visit one year after inclusion into the study to record any complications which have developed (possible myocardial infarction, reason, any new revascularisation of the target lesion or another artery and reason for this, any deaths and their causes).
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- All
- Target Recruitment
- 307
- Men or women, aged 18 years and over.
- Uncoated, coated or bioresorbable stent restenosis, defined by lumen obstruction of over 50% in the stent and/or within 5 mm proximal or distal to the stent found on coronary angiography.
- Patients treated for an acute coronary syndrome in which restenosis is suspected. It is recommended that OCT be performed after restoring TIMI grade 3 coronary flow in the initial investigation or in a later review at < 7 days.
- Patient informed consent.
- Subscription to a social security system.
-
Technical inability to perform the OCT (distal lesions, severe chronic renal failure).
-
Contraindication to the use of ABBOTT systems when insertion of any type of catheter represents a risk to the patient. The contraindications include the following:
- Bacteraemia or septicaemia
- Significant coagulation system abnormalities
- Patients in whom coronary artery spasm has been diagnosed
- Patients who do not meet the criteria for coronary artery bypass grafting
- Patients who do not meet the criteria for percutaneous coronary angioplasty
- Severe haemodynamic shock or instability
- Total occlusion
-
Life expectancy of under one year for non-cardiac reasons.
-
Pregnant or breast-feeding women or women who are fertile and not taking appropriate contraceptives.
-
Patients under legal protection or guardianship
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- SINGLE_GROUP
- Arm && Interventions
Group Intervention Description OCT Optical Coherence Tomography (OCT) Patient witch coronary artery disease who has been stented and is hospitalised for stable angina or acute coronary syndrome requiring a further coronary angiogram (regardless of time since implantation or type of the initial stent. - Identification of intrastent restenosis during coronary angiography and realisation of an immediate or deferred OCT.
- Primary Outcome Measures
Name Time Method Characteristics of morphological abnormalities, seen on OCT on millimetre sections of the whole stented segment (5 mm proximally and distally to the stent), potentially responsible for the intrastent restenosis day 0 Progression of the proximal or distal atherosclerosis .
- Secondary Outcome Measures
Name Time Method Clinical data day 0 TIA
Cardiovascular risk factors day 0 smoking habit
Blood sample day 0, day 365 Measure of renal clearance
New revascularisation events day 365 new revascularisation event in the target lesion or another artery, myocardial infarctions, deaths and causes of events
Trial Locations
- Locations (27)
Université- Hôpital Leuven
🇧🇪Leuven, Belgium
CHUV de Lausanne
🇨🇭Lausanne, Switzerland
Centre Hospitalier Départemental Vendée
🇫🇷La Roche-sur-Yon, France
Clinique la Roseraie
🇫🇷Aubervilliers, France
Centre Hospitalier Saint Joseph Saint Luc
🇫🇷Lyon, France
Polyclinique les fleurs
🇫🇷Ollioules, France
CHU Clermont Ferrand
🇫🇷Clermont-Ferrand, Auvergne, France
CH Avignon
🇫🇷Avignon, France
CHRU Besançon
🇫🇷Besançon, France
CHU Bordeaux
🇫🇷Bordeaux, France
CHRU Morvan
🇫🇷Brest, France
Hôpital privé saint Martin
🇫🇷Cauro, France
Centre Hospitalier les Hôpitaux de Chartres
🇫🇷Chartres, France
CHRU Grenoble Alpes
🇫🇷Grenoble, France
CHRU Lille
🇫🇷Lille, France
Hospices Civiles Lyon
🇫🇷Lyon, France
AP-HM
🇫🇷Marseille, France
CHRU Nîmes
🇫🇷Nîmes, France
AP-HP
🇫🇷Paris, France
Hôpital Privé Institut Mutualiste Montsouris
🇫🇷Paris, France
CHRU Poitiers
🇫🇷Poitiers, France
Clinique Saint Hilaire
🇫🇷Rouen, France
CHRU Strasbourg
🇫🇷Strasbourg, France
CHRU Toulouse
🇫🇷Toulouse, France
Clinique Pasteur Toulouse
🇫🇷Toucy, France
CHRU Hôpitaux de Tours
🇫🇷Tours, France
CH de Bern
🇨🇭Bern, Switzerland