Comparing PCI and medical therapy for chronic total occlusion in heart disease
Official title: International Randomized Trial on the Effect of Revascularization or Optimal Medical Therapy of Chronic Total Coronary Occlusions With Myocardial Ischemia - ISCHEMIA-CTO Trial
Run by Aarhus University Hospital Skejby · NCT03563417 · Data updated 2026-11-12
This study is testing whether a new heart procedure using special stents can help people with blocked arteries feel better and have fewer heart problems compared to just taking medication.
Quick facts
| Study type | Interventional |
|---|---|
| Ages | 18 Years and up |
| Sex | All |
| Enrollment | 1560 (estimated) |
| Sponsor | Aarhus University Hospital Skejby Academic / other |
| Locations | 27 sites (Aarhus N and 26 other locations) |
| Status | Recruiting |
| Started | November 6, 2018 |
| Main results expected | November 1, 2028 |
| Study ends | November 1, 2032 |
| Registry record updated | January 2, 2026 |
| Trial ID | NCT03563417 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Ideal candidates are adults aged 18 and older with chronic total occlusion in a native coronary artery and evidence of myocardial ischemia.
✕Probably not a fit
Patients with recent heart attacks or unsuitable coronary anatomy for PCI may not benefit from this study.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This clinical trial investigates the effectiveness of Percutaneous Coronary Intervention (PCI) using the latest drug-eluting stents compared to optimal medical therapy (OMT) in patients with chronic total occlusion (CTO) of coronary arteries. It is a prospective randomized open-label multicenter study that includes both asymptomatic and symptomatic patients with varying degrees of myocardial ischemia. Patients will undergo three months of OMT before being randomized into treatment groups, with outcomes measured in terms of major adverse cardiovascular events and quality of life improvements. The study aims to provide clearer evidence on the benefits of PCI in managing CTO.
Why it matters
Potential benefit: If successful, this study could provide evidence that PCI is more effective than medical therapy in improving outcomes for patients with chronic total occlusion.
How similar studies have gone: Previous studies on similar topics have faced challenges, with some failing to demonstrate clear benefits, indicating that this approach is still under investigation.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: * CTO in native coronary artery * Myocardial ischemia in a territory supplied by CTO assessed by nuclear imaging. * Age ≥18 yrs. * Able to provide written informed consent and willing to comply with the specified follow-up contacts. * Target artery ≥ 2.5 mm Prior to randomization all patients undergo 3 months of OMT. Subsequently the population will be divided into: Cohort A: Asymptomatic (CCS \< 2 and SAQ QoL \> 60) patients with myocardial ischemia (≥ 10% of LV) in a territory supplied by CTO Cohort B: Symptomatic patients (CCS class ≥ 2 and/or SAQ QoL score ≤ 60 after treating non CTO lesions and after OMT) with Myocardial ischemia (5% of LV) in a territory supplied a CTO assess by nuclear imaging. Cohort C: Screening population not eligible for randomization in cohort A or B Exclusion Criteria: * NSTEMI or STEMI within 1 month * Coronary anatomy not suitable for CTO-procedure * Coronary disease involving the left main/three vessel disease with indication for CABG following heart team conference. * Life expectancy \< 2 years * Severe chronic pulmonary disease (FEV1 \< 30 % of predicted value) * Contraindication to dual anti-platelet therapy * Pregnancy * eGFR \< 30 mL/min/1.73 m2 * In multi-vessel disease: if it is deemed unsafe to treat the non-CTO lesion first. * Severe valvular heart disease
Where it's running
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Aarhus University Hospital
Aarhus N, Denmark Recruiting -
Rigshospitalet
Copenhagen, Denmark Recruiting -
Gentofte Hospital
Hellerup, Denmark Recruiting -
Odense University Hospital
Odense, Denmark Recruiting -
Zealand University Hospital
Roskilde, Denmark Recruiting -
North-Estonia Medical Centre
Tallinn, Estonia Recruiting
Show 21 more locations
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Heart Hospital Tampere
Tampere, Finland Recruiting -
Turku University Hospital
Turku, Finland Recruiting -
Cardiovascular Institute, Groupe Hospitalier Mutualiste
Grenoble, France Recruiting -
Hospital Galdakao
Galdakao, Bizkaia, Spain Recruiting -
Hospital Clinic
Barcelona, Spain Recruiting -
Hospital Universitario Clinico San Carlos
Madrid, Spain Recruiting -
Hospital Universitari de Tarragona Joan XXIII
Tarragona, Spain Recruiting -
Sahlgrenska University Hospital
Gothenburg, Sweden Recruiting -
Helsinki University Central Hospital
Helsinki, Finland Active not recruiting -
Kuopio University Hospital
Kuopio, Finland Active not recruiting -
Clinique Louis Pasteur
Essey-lès-Nancy, France Active not recruiting -
Hospital Germans Trias I Pujol
Badalona, Barcelona, Spain Active not recruiting -
Hospital Vall de Hebron
Barcelona, Spain Active not recruiting -
Hospital de Bellvitge
Barcelona, Spain Active not recruiting -
Hospital la Paz
Madrid, Spain Active not recruiting -
Skaane University Hospital (Lund)
Lund, Sweden Active not recruiting -
Stockholm South Central Hospital (Södersjukhuset)
Stockholm, Sweden Active not recruiting -
Belfast Health and Social Care Trust, Department of Cardiology
Belfast, United Kingdom Active not recruiting -
University Hospital Bristol
Bristol, United Kingdom Active not recruiting -
Barts Health NHS
London, United Kingdom Active not recruiting -
St George's University Hospital
London, United Kingdom Active not recruiting
Study contacts
- Principal investigator: Evald Christiansen, MD PhD — Aarhus University Hospital
- Study coordinator: Evald Christiansen, MD PhD
- Email: evald.christiansen@dadlnet.dk
- Phone: +45 78452028
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.