Clinical trial Recruiting at 14 sites Interventional Ages 18 and up

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.

More Ischemic Heart Disease trials

Quick facts

Study typeInterventional
Ages18 Years and up
SexAll
Enrollment1560 (estimated)
SponsorAarhus University Hospital Skejby
Academic / other
Locations27 sites (Aarhus N and 26 other locations)
StatusRecruiting
StartedNovember 6, 2018
Main results expectedNovember 1, 2028
Study endsNovember 1, 2032
Registry record updatedJanuary 2, 2026
Trial IDNCT03563417 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

  • 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
  • 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

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.