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ST Elevation Myocardial InfarctionPICNICNCT06506448

Risk Characterization of Non-culprit Vessels in Patients Undergoing Primary PCI for ST-elevation MI in Multivessel Disease

An observational study of ST Elevation Myocardial Infarction, run by University Hospital Southampton NHS Foundation Trust at 3 sites in United Kingdom.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
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Trial summary

Most heart attacks occur because a clot forms in a coronary artery blocking blood flow. Without blood heart muscle dies. Untreated, clots can cause a specific type of heart attack -ST-elevation myocardial infarction (STEMI). Read more about this study

Who is it for?
Ages 18 to 85 years
Conditions the study is for
ST Elevation Myocardial Infarction
What is being tested?
CT Coronary Angiography
How many people
320 participants
Where
3 sitesUnited Kingdom
Study dates
20 Jan 2025to Jan 2029
Phase
Observational
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 85 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Study population: Patients presenting with ST elevation myocardial infarction who are found to have significant stenoses in the non-infarct related artery(s) defined as coronary stenosis >50% by visual estimation

Who may be able to join

  • Ability to provide written informed consent (post PPCI)
  • Age 18 years to 85 years
  • Presentation of acute STEMI within 12 hours of symptom on-set
  • Culprit artery PPCI
  • Coronary stenosis of > 50% diameter stenosis by visual estimation in NIRA with a minimum diameter of 2.5mm

Who cannot join

  • Cardiogenic shock
  • Decompensated heart failure requiring intubation, inotropes, or intra-aortic balloon counter pulsation
  • Refractory ventricular arrhythmia
  • Previous coronary artery bypass surgery (CABG)
  • Stent thrombosis and in stent restenosis
  • An intention before inclusion into the study to revascularize a non-culprit lesion
Show all 24Show fewer
  • Active malignancy or inflammatory disorders such as rheumatoid arthritis or inflammatory bowel disease
  • Severe valvular heart disease requiring surgery
  • Planned surgical revascularisation
  • Active participation in another study/trial
  • < 12 months life expectancy
  • Contraindication to CTCA
  • Presence of internal defibrillator
  • Known allergy to iodinated contrast
  • Pregnancy
  • Contraindication to intravenous beta blockade
  • Contraindication to acute sublingual nitrate administration
  • Mechanical prosthetic heart valve
  • Advanced renal impairment (creatinine >200)
  • Significant valve disease (sever aortic stenosis or regurgitation; severe mitral regurgitation)
  • Angiographic exclusion criteria
  • NIRA stenosis of 50% or more in the left main stem or the ostia of both the left anterior descending and circumflex arteries
  • < TIMI (thrombolysis in myocardial infarction) flow grade 3 in the NIRA,
  • Evidence of thrombus in the NIRA.

Trial locations and contacts

3 sites in 1 country. Contact the study team or a site near you to ask about taking part.

United Kingdom3 sites, 3 recruiting
  • University Hospitals Dorset NHS Foundation Trust

    Bournemouth, Dorset, BH15 2JB

    Jonathan Hinton, MD, 01202303626, jonathan.hinton@uhd.nhs.uk

    Recruiting
  • University Hospital Southampton NHS Foundation Trust

    Southampton, Hampshire, SO16 6YD

    Nick Curzen, BM (Hons) PhD FRCP, nick.curzen@uhs.nhs.uk

    Nick Curzen, BM(Hons) PhD FRCP

    Recruiting
  • Royal Stoke University Hospital

    Stoke-on-Trent, Staffordshire, ST4 6QG

    Mamas Mamas, 01782 715444, mamasmamas1@yahoo.co.uk

    Recruiting

Other trials in United Kingdom

About this study

Official title: Anatomical, Physiological and Inflammatory Characterization of the Non-Culprit Vessels in Patients Undergoing Primary PCI for ST-Elevation Myocardial Infarction in the Presence of Multivessel Disease Toward a Personalised Approach to Complete Revascularisation After Primary PCI

Most heart attacks occur because a clot forms in a coronary artery blocking blood flow. Without blood heart muscle dies. Untreated, clots can cause a specific type of heart attack -ST-elevation myocardial infarction (STEMI). STEMI patients are treated immediately by finding the blocked artery ("culprit" lesion) using a dye injected into the coronary arteries and then by unblocking the artery using balloons and stents. This procedure - primary angioplasty - is offered 24/7 and limits the size of heart attacks and saves lives.

Cardiologists know how to treat STEMI patients but it's less clear what to do about narrowings in other coronary arteries ("bystander" disease). This is important - if they're left alone some bystander lesions can cause future events including heart attacks or angina. Recent trials compared stenting ALL the bystander narrowings after primary angioplasty, with stenting none and showed some benefit from stenting all of them ("complete revascularisation").

Read more

However, complete revascularisation carries extra risk, putting patients through more complicated procedures and using up resource. A blanket strategy of complete revascularisation of ALL bystander narrowings in ALL STEMI patients is unlikely to be the correct answer as only a small minority of these patients have further events.

In PICNIC the investigators want to identify bystander narrowings most likely to cause a future event, and those unlikely to do so. The study can then test the hypothesis that only the high-risk bystander narrowings need stenting, and the others can be treated with tablets only. Investigators will study patients using specialised imaging techniques from coronary artery CT scans and levels of inflammation to see which narrowings cause future events and which do not. If this can be done, a case can be made to test complete revascularisation only in bystander narrowings that look high risk.

Read the detailed description

Approximately 50% of patients presenting with an acute ST-segment elevation myocardial infarction (STEMI) have multivessel coronary artery disease (CAD). Five randomized studies have shown that complete revascularization, either at the time of primary percutaneous coronary intervention (PPCI) or within 45 days of the index admission, is safe and reduces the risk of repeat coronary revascularization and myocardial infarction (MI), particularly in the non-infarct related artery (NIRA). Despite these improvements in clinical outcomes, no study to date has provided a mechanistic insight as to how complete revascularization of chronic bystander disease may lead to the observed benefit. Indeed, the randomized studies, through the variable nature of their results (reduction in MI versus revascularization etc), have suggested the possibility that there are differing mechanisms for the observed benefit. The data would also be consistent with the concept that not all patients undergoing primary PCI with bystander disease require or benefit from complete revascularisation. This is an important possibility with important potential implications for resource utilisation and patient experience.

The investigators hypothesize that the susceptibility of non-culprit disease to ischaemic events after primary PCI is variable between individuals, and possibly even between their coronary vessels and lesions. Specifically, the investigators postulate that this susceptibility may be related to multiple factors including their anatomical and physiological vulnerability, and their local vascular inflammatory status. In order to test this hypothesis, the investigators will systematically examine the following parameters in each bystander coronary vessel in patients who present with STEMI and are undergoing primary PCI of the culprit vessel:

  1. markers of systemic inflammatory status
  2. plaque anatomy including lesion severity and markers of lesion vulnerability on CTCA
  3. assessment of individual coronary vessel inflammation using CT-derived fat attenuation index
  4. vessel physiology using FFRCT (fractional flow reserve from computed tomography) incorporating wall shear stress and axial plaque stress.

Aims

The aims of this study are to address the following research questions:

  1. What are the anatomical, physiological \& inflammatory features of lesions in the NIRA(s) of patients presenting with STEMI who are treated with a strategy of culprit-only PPCI?
  2. Is there an association between these anatomical, physiological \& inflammatory features and the risk of non-culprit lesions causing adverse events in STEMI patients with significant bystander disease in the NIRA(s)?
Being tested
CT Coronary Angiography
Keywords
Primary percutaneous coronary intervention, Infarct related artery, Non-infarct related artery, Computerised Tomography Coronary Angiography CTCA, Fractional Flow Reserve from CT (FFRct), Fat Attenuation Index (FAI), Inflammation
Medical subject headings
ST Elevation Myocardial Infarction, Inflammation

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • CT Coronary AngiographyDiagnostic test

    Also called FFRCT and plaque analysis (HeartFlow) and Fat Attenuation Index (Caristo)

    CTCA for anatomical, physiological, plaque composition and inflammatory assessment of coronary arteries

Study groups in NCT06506448
Study groupRoleWhat they receive
STEMI patients with multivessel disease320 patients undergoing primary angioplasty for ST-elevation myocardial infarction (STEMI) who have bystander disease in a main coronary artery with at least one stenosis of 50% or more
Receives: Diagnostic Test: CT Coronary Angiography

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Correlation between major adverse cardiac & cerebrovascular events (MACCE) and CTCA-derived anatomical, physiological, plaque & inflammatory characteristics and serum inflammatory markers at 2 years

    Correlation between:

    1. major adverse cardiac \& cerebrovascular events (MACCE) defined as the composite of all-cause mortality, cardiovascular death, cardiac arrest, acute coronary syndrome (unstable angina, NSTEMI, or STEMI), additional revascularization by CABG or PCI, rehospitalisation for angina, heart failure, stroke, ventricular or atrial fibrillation or tachyarrhythmia at 2 years \&:
    2. Anatomical \& physiological characteristics of coronary vessels/lesions in the NIRA(s) as assessed by CTCA parameters (FFRCT + FAI + plaque characteristics)

    Measured: 2 years

Secondary outcomes (4)
  1. Correlation between major adverse cardiac & cerebrovascular events (MACCE) and components of CTCA-derived anatomical, physiological, plaque & inflammatory characteristics and serum inflammatory markers at 1 year

    Correlation between:

    1. major adverse cardiac \& cerebrovascular events (MACCE) defined as the composite of all-cause mortality, cardiovascular death, cardiac arrest, acute coronary syndrome (unstable angina, NSTEMI, or STEMI), additional revascularization by CABG or PCI, rehospitalisation for angina, heart failure, stroke, ventricular or atrial fibrillation or tachyarrhythmia at 1 year \&:
    2. Anatomical \& physiological characteristics of coronary vessels/lesions in the NIRA(s) as assessed by CTCA/FFRCT/FAI parameters between individual components of MACCE

    Measured: 1 year

  2. Correlation between anatomical, physiological & serum inflammatory markers and future adverse events at 3 years

    Correlation between:

    1. major adverse cardiac \& cerebrovascular events (MACCE) defined as the composite of all-cause mortality, cardiovascular death, cardiac arrest, acute coronary syndrome (unstable angina, NSTEMI, or STEMI), additional revascularization by CABG or PCI, rehospitalisation for angina, heart failure, stroke, ventricular or atrial fibrillation or tachyarrhythmia at 3 years \&:
    2. Anatomical \& physiological characteristics of coronary vessels/lesions in the NIRA(s) as assessed by CTCA/FFRCT/FAI parameters between individual components of MACCE

    Measured: 3 years

  3. Development of a risk score to predict clinical events based upon individual-, vessel- & lesion-specific factors

    To build a multidimensional AI-mediated deep learning model that uses the following data inputs (a) blood biomarkers, (b) CTCA lesion severity, (c) CTCA conventional plaque characteristics (e.g. spotty calcification etc); (d) FFRCT-derived plaque characteristic (ie adverse plaque and haemodynamic characteristics); (d) FAI-derived output; (e) clinical characteristics in order to correlate them with clinical events. The model will then be used to develop a risk score

    Measured: 1 year

  4. Development of a risk score to predict clinical events based upon individual-, vessel- & lesion-specific factors

    To build a multidimensional AI-mediated deep learning model that uses the following data inputs (a) blood biomarkers, (b) CTCA lesion severity, (c) CTCA conventional plaque characteristics (e.g. spotty calcification etc); (d) FFRCT-derived plaque characteristic (ie adverse plaque and haemodynamic characteristics); (d) FAI-derived output; (e) clinical characteristics in order to correlate them with clinical events. The model will then be used to develop a risk score

    Measured: 3 years

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted17 Jul 2024
  2. Study start20 Jan 2025
  3. Primary completionMar 2026 (estimated)
  4. Study completionJan 2029 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Observational
Observational model
Cohort
Time perspective
Prospective
Enrolment
320 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06506448
Sponsor's protocol ID
RHMCAR0647
Acronym
PICNIC
Status last verified
Sep 2025
First submitted
22 May 2024
Last updated
23 Sep 2025
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No: Not applicable. There will be no individual participant data available to other researchers.

Publications

  • Heller T, Ong P, Sechtem U, Bekeredjian R. Management of multivessel disease in patients with ST-segment elevation myocardial infarction: questioning routine immediate complete revascularization in all patients. Coron Artery Dis. 2026 Dec 1;37(8):625-633. doi: 10.1097/MCA.0000000000001661. Epub 2026 Jul 10.

    PubMed 42423587

Questions about this trial

What is this clinical trial studying?

An observational study of ST Elevation Myocardial Infarction, run by University Hospital Southampton NHS Foundation Trust at 3 sites in United Kingdom.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 5 inclusion and 24 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 23 Sep 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 3 sites in United Kingdom. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Zoe Nicholas (02381208538, zoe.nicholas@uhs.nhs.uk), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Correlation between major adverse cardiac & cerebrovascular events (MACCE) and CTCA-derived anatomical, physiological, plaque & inflammatory characteristics and serum inflammatory markers at 2 years (time frame: 2 years). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT06506448, which also lists 1 linked publication.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 23 Sep 2025.

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